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Show [ 174 J 306 · ul the Si.UHe fc :-ttnrc m:-ty be observed in some figured by Brongniart him. ·elt: fi. PEcoPTt·; n 1: uNntrLATA. Pl. 1, fi gs. 1, l rt. (No~. 83 aud 11 of co1• .ect iou.) . . 1. 1 1 · 1 1· J)escription.-F'rolld '''.P lllllate; rae us s em er; pmnm .ong, s 1ghtly ob. ~ique to tlw raellis, nppo•-;I!e and alternate; p1nriules ohltcplC, oval-ov~tc broad at tire ha~·w , rtlld the lowc: r Oll~S sorn~· tuncs lolwcl, grad ually bccouuno coadunatt~ towards the extre1u1ty ol the ptlHJ<l!: . The pi 11 nules lwve ofteu au apparently co ntm~1011 ~ srnonth ontlme; b~1t, on closer e. amirtaliotl. thuy :t ppcar undul ated or wdcuted upotJ tire maratn; ud nwuy of the1u arc obv iously so. 7. P ECOl'Tl·:nr .... H~nUL.A'I' A; l rn·. 1)1 · 1 , 1r1.,ob-'"·' · ,C.J. ,, '..>.. rt , .C.), ''·' · (No · ,...,s of co I• 1cctio11.) . . . . Dc.w·ri;1/inn.-Fron(l lnputnatc·. ; rnelus s l ~·nclcr.; ]>lltn<.e llttmerous, lontt, awl gradttitlly !:lJWriJ tg, ohlicp tc to tlu rach t: .; . puttl~llr.s ovn l-ova.r e, broad 1.L bas1'; midrib evarwscen l; uervu iL's slronp-, htltJl'Catm~ towards the apex: margitls In bud or iuucn1ed, particularly in tl .lOsc n~a r the ba~e of tlte pin11.a.·. Th i~ spvcic·::; tnt1y he rcg~ndccl ns a v.:::t rtety o{ tl1c last, thou ah the Pll.l· nulc~ are lntlgPr and lc ... s hrn<1d proporiLOIJally; but the ge11cral aspect 1: :-:,1mi l ~ r , <utcllltc llai>it nl' tile pla11t preci~uly the same. . Till' spcciitle tt fig. ~ b can only he regarded a· an extreme vat:wty of thf.' '\a me =-peciu[-;, w llicll is approach<'<l in some of tile enla rged pumnlcs, as I •j ()' C) ({ ""b• - . • P~<:coPTEHt s (?) onoNTOPTETWillE S. Pl. 1, figs. 3 and '1. (Nos. 78 and 118 of collt:ctiot1.) DrscriJJLion. - From! bipinnatc? pinu;c long ::tnd . slende r ~ secondary pitww stt h-distntll, ~r<uln nlly l ~tpt~ritJg, u~arly perpencliculnr; pmnnles snurolnlld1 oLtu:c, Slltall, approxtrnal<', ohhqnc, al ternate, anu coaduuate Ul ~Hl.SI'; n crvnlr~~; strong divrrgiu')' from hase · 110 distinct midrib. Fig. •l. A l't'w of the pintHD Jlear the le rmi na.tiou o~ a fro~HJ . The arraun·cllll'llt nf the pintw lrs aw.l u rvc · iu th1s spec1es strorwly rc: ninds one' n? the Odonlopteris Schlolheimii, Bronn-. Tiist. Vcg. Foss., P· 25 >, t. IS, iig. 5-a f(> sil fern of tlw Pennsylvania coal measures ; but tl11s is essentially tliffcrent. The aspect of tile throe Ia t-namccl plants is more like that o.f t.he tmc -coal-mensnre ferns than any or the others; bnt the whole assoctatwn, and their fossil coutlition, demaud that they should. be referred to a very modern perioJ. New genttS-TJucuoPT Elus. Clw:racte1·.-Froncl slender, flexuous, in tnfts or single, branching or ~innate; branches long, very sleuder. U. TnicnoPTI~nis FILAMENTO A. Pl. 2, fig. 6. (No. 78 of collection.) Compare Fucoides cequalis, Drong. Ilist. Veg. Foss., p. 58, t. 5, .figs. 3 and 4. Desc'ription.-Frond pinnate or bipinnate; rachis long, and almost ~qualJY slender throughout; branches numerous, regular, alternate, simple, elongated, very slender, and flexuous. The branches are frequently folded back upon themselves, and undul~te~, ly'n.g like the finest thread upon the surface of the stone. This spec1~s 13 very ·delicate and graceful, and can scal'cely be examined without the a1d of 307 [ 174 ] a mG:.gnifier. This fo ss il is very similar to the Fucoirles CPqualis of llrong., (from the lower chalk,) except tlw.t tlte hrauches are longer anu unuivided. 10. TRICIIOPTE IUS OHACI LIS. Pl. l, fig. 5. (No . •1 of collection.) JJescription.-Slcnder, stents 11umcrous, 1l e xn~n1 ·, in a tuft, branched· branches numerous, slender, ohliq11e, strouger titan ill tltc last specie . ' This species is more robust tbau tlw first de cribcd, unt evidently belongs to the same genus. I l1ad first supposeu that this n1i ttht be a collection of fern stems, strippe(l of their fuliag'; bnt tlteir slcudcr structure lonobranchcs, and peculiar arrangement, with tl tc appropriate proportiot{ of ali the parts, forbid its reference to auy tlli1Jg of this kiutl; it is therefore placed in a new genus. ll. STEM. OF Fl~RNS. Pl. 1' fi~. 7. The stems of ferns, dennd e(l or leaves, and portions only of the branches remaiuing. Great numbers of' these stems occur, mingled with fragments of leaves and other portions of ferns sti ll perfect. 12. LEAF oF A DYCO'l'YLEDONou · J'1, NT. (?) Pl. 2, fig. 4. (Fr. Aug. 17, aud No. 201 of collectio u. ) Desc?·iption.-Leafovate-lauecolate, lobeu, lobes acntc, mucronate; miJ rib straight, distinct, diclwtonwus; principal divisious going to the mucronate point ·. This leaf has the a pect of the leaf of a uicotyledonons plant, and approaehes remotely only to the character of species of the genus Pltleboptc?' is of Brongmart, which arc regarded as such by Pbillips, anu by Lind ley and IIn!ton. The specimeu was ll ut observed soou cuougiJ to make a ~uis(~ lC!ory comparison. Locality, in the 11cighborhood of the specimens con taining the precedint)' fossils, and regarded by Captain Fr6rnont as belonging to the same formation. The rock containing them is a soft or very partially indurated clay; very unlike the hard aud brittle n1ass containing the other species. PLATE III. Fossil ·h lls, &c. Figures 1, 2, 3, 4, 5, G, and 7, nrc from longitude 1 L L 0 , latitude 40°. Figures 11, 12, and 13, ur from longitude 111°, latitude 4 1 ~ 0• Figures 8, 9, and 10, arc from lottgitudc 115°, la.titutlo 13°. Figures 11 antll5, loaves, from longitude 122°, latitude 1 5~ 0• 13. MYA TELLINOIDE •· Pl. 3, figs. 1 and 2. Compare unio pereg1'l·- nttSj Phillips's Geol. Yorkshire, pl. 7, .fig. 12. (Nos. 8, 28, and 32, of collection.) · Description.-Ovate, posterior siue extended, slope gentle, rounded at the extremity; anterior side regularly rounded; surface nearly s1nooth, or marked only by lines of o-rowth · beaks slightly wrinkled; moderately prom.m ent. b ' The specimen fig. 1 is an entire shell; fig. 2 is a cast of the two valves of a smaller specimen, retaining a small portion of the shell. Another s~ectmen, larger than either of these presents the inside of both valves, wuh the hinge broken. ' Locality in longitude 111 o, latitude 40°, in slaty bituminous limestone. • The species, where no authority is given, arc regarded o.s new, and will be so understood. |
