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Show 352 MOLLUSCA. · PTEROTRACHEA, Forsk., But we have been compelled to subdivide them. CARINARL~, Lam.(l) The nucI eus 11! orme d of the heart ' liver and org. ans f of g.e n,e r.a tion, covere d b y a s1 e n der' symmetrical shell, the pomt o wh1cn 1s be. nt backwar d s an d f r equently relieved by. a crest, under 1w hose anter1or edge float t h e 1.!e at hers of the branch1ce; two tentacu a on the head, and the eyes behind their base. . , One spect· es, Carinaria cymbwm, Lam.; Peron, Ann. du Mus., V ... 15 • Poli III xliv; Ann. des Sc. Nat., tome XVI, pl. X , 111, , ' ' 1, inhabits the Mediterranean. . . . . Anot h er, the Carinaria J:ragths, Bory Samt.- Vmcent, Voy. I 1 d'Afi·. J vi 4(2), is found in the Indtan Ocean. aux s es ' ' ' · · M · · I .9. ta vitrea of authot·s, Favanne, vn, c, 2;' artmt, , The rgonau . h · 1' x.m.. , 163, must b e the shell of a large Carinar1a, but t e amma 1s not yet known. ATLANTA, Lesueur(3). A 1 t f Lesueur according to the recent observations ofM. The t an ce o ' . . d f b . Rang, are am· ma1 s of this order ' the shell of wh1ch, mste.a o . etng 11 we1 1 opene d l1'k e that of a Carinaria, has a narrow cahV' Ity, sptra y 1 t d On One plane· its contour is relieved by a t m crest. convo u e ' · 0 · They are extremely small Mollusca from the Incllan c~a~,m one of which Lamanon thought he had discovered the ortgm~l Cornu A mmom. s (4) - .!ltlanta Peronii and .!ltlanta KeraudrRen u, Lesueur, Journ. de Phys., fxxxv, Novemb. 1817; and. ang, Mem. de la Soc. d'Hist. Nat., tome III, P· 373, and pl. lX. FrRoLA, Peron. The body, tail, foot, branch1.c e and v.t scera1 mass as 1•n the Carin aria, • • p TRACHEA for which (1) Forskahl comprised all these animals m hJs genus . TERO. • t~e enus, name llrugiere substituted that of Fxnou. Peron havmg diVIde~ F' :to the appropriated the name of Carinaria to those with a shell, and that o tr: Zoopb. others. Ronde let gives the Carinaria, but without its shell-" De In sec cap. XX." b 1829 P· 136. (2) Add: Carinaria depressa, Rang, Ann. des Sc. Nat., Fe · ' d 'bed by , . tl the JJ.tlm escn (3) we must not confound the .O.tlantre of Lesueut Wl 1 . d t know him in the same p. lace, and which, so confused 1. s h't s d escrl. p bon ' I o no how to class. (4) Voyage de Lapeyrouse, IV, p. 134, and pl. 63, f.l--4. GASTEROPODA HETEROPODA. 353 but no shell has ever been observed; the snout is elongated into arecurved proboscis, and the eyes are not preceded by tentacula. From the end of the tail is ft·equently observed to proceed a long articulated fillet, which Forskahl took for a Trenia, and whose nature is not yet very clearly ascertained. One species, the Pterotrachea coronata, Forsk.; Peron., Ann. du Mus., XV, ii, 8, is very common in the Mediterranean, and M. Lesueur describes seve1·al from the same sea, which he considers as different-Journ. Acad. Nat. Sc. Philad., Vol. I, p. 3, but which require further comparison(!). M. Lesueur distinguishes the FIRoLOID.IE, where the body, instead of terminating in a compressed tail, is abruptly truncated behind the visceral bundle, lb. p. 37(2). To these two, now well known genera, I pt·esume we must add, when better undet·stoo<l, the TIMORIENN A, Quoy and Gaym • Voy. de Freycin., Zoo!. pl. Ixxxvii, f. 1, which appeat·s to be a Firola divested of its foot and bundle of viscera; and the MoNOPIIORA, ld.(3), Voy. de Freycin., Zoo). pl. lxxxvii, f. 4, 5, which has nearly the form of a Carinaria, but is without a foot, distinct bundle of viscera, and shell. We are not so certain that we should place thet·e the PnYLLIRoE, Peron., Ann. du Mus., XV, pl. ii, f. 1, where the transparent and strongly compressed body has a snout befol'e, surmounted by two long tentacula without eyes, a truncated tail behind, and which allows its heart, nervous system, stomach, and genital organs of both sexes to be seen through the integuments. The genital orifices and that of the anus a1·e on the right side, and sometimes a tolerably long penis (1) Firola mutica;-F. gibboaa;-F. Forskalea;-F. C11-viera, which is the Pterolrachea coronata, Forsk.;-F. Frederica, copied Malacol. Blainv., pl. xlvii, f. 4;- F'.P .. · eronu.-Add: Pterotracltea 1'Uja, Quoy and Gaym., Voy. de Freycin., Zoo). pl. 87, f. 2 and 3. (2) Firoloi'da Demarestia,·-Fir. Blainvilliana;-Fi1·. aculeata, Less. ( 3 ) We must not confound them with the Monophora: of M. Bory Saint·Vin· cent, (Voy. aux Isles d'Afr.,) which are Pyrosoma:. VoL. II.-2 U |