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Show 342 MOLLUSCA. s. pelagica, L.; Cuv., Ann. du Mus., VI, lxi, 1, s, 4. Common on the floating fucus of almost every sea. GLAucus, Forster. Body elongated; orifices of the anus and of the genital organs as in the preceding; four very small conical tentacula, and on each side three branchire, each of which are formed of long slips arranged like the sticks of a fan, which also aid them in swimming. They are beautiful little animals, that inhabit the Mediterranean and the Atlantic, prettily coloured with blue and nacre; they swim on theh· back with great swiftness. Their anatomical structure is vet·y simi· lar to that of the Tritonia, but the species are not yet well ascer· tained( 1 ). LANIOGERus, Blainv. Two series, on each side, of small and finely pectinated laminre, which are the branchire; the body shorter and thicker than that of a Glaucus, but there are four small similai· tentacula(2). EoLIDIA, Cuv. Resembles a small Limax in form; four tentacula above, and two on the sides of the mouth; the branchire composed of laminre, arranged like scales, mere or less crowded, on each side of the back. Found in every sea(3). CAVOLINA, Brug., The tentacula of the Eolidi~, with retiform branchire, arranged in transverse rows on the back(4). (1) Doris radiata, Gm., Dup., Phil. Trans., LUI, pl. iii;-Scyllee macree, Bose., Hist. des Vers;-Glaucus at/anticus, Blumenb., fig., Nat. Uist., pl. 48, and Manuel., fr. trans., II, p. 22; Cuv., Ann. du Mus., VI, lxi, ii, Peron, Ann. Mus. XV, iii, 9. (2) Laniogerus Elfortii, Blainv., Malac., pl. xlvi, f. 4. (3) Dori.s papillosa, Zoo]. Dan., CXLIX, l-4;-Doris bodoensia, Gunner., Act. Hafn., X? 170;-~a minima, Forsk., Ic., xxvi, II;-Doris fasr:iculata, Id.,Ib., ·<-::-Dms branchwha, Zool. Dan. CXLIX, 5-7;-Doris crerulea, Lin. Trans., Vll, vu, 84;-Eolidia Mstrix, Otto., Nov. Act. Nat. Cur., XI, xxxviii, 2, &c. (4) .Doris peregrina, Gm., Cavolini, Polyp. Mar., VII, 3;-Eolidia annulicorni1, Cham1sso, Nov. Act. Nat. Cur., XJ, part 11, pl. xxiv, f. 1;-Dorialongicornu, Lin. Trans., IX, vii, 114? N.B. This genus must not be confounded with the Cavolina of Abildgard, which is the Hyakea. GASTEROPODA NUDIBRANCHIAT A. 843 FLABELUINA, Cuv. The tentacula of the Eolidre, with radiating rectiform branchi~ supported b~ five ~r six pedicles on each side; they are closely allie~ to the Glauc1, and m fact to all the Nudibranchiata, whose branchire are situated on the sides of the back( 1 ). TERGIPEs, Cuv. The _form of th~ Eolidire, bu: only two tentacula, with a range of cyl· indr1cal branch1ce on both s1des of the back, each of which is terminated by a little sucker or cup, and which are used by the animal as feet, to walk on its back. The species known are very smalJ(2). BusiRis, Risso. The body oblong, and back convex.; two filiform tentacula, and behind them, on the nape, two plumiform branchire(3). PLACOBRANCHus, Van Hasselt. Two tentacula and as many labial lobes; the whole back, widened by its margin, is covered with numerous radiating strire, which are the branchire. In its ordinary condition the widened borders of the mantle are turned up, and cross each other to form an envelope for the branchire, which are thus enclosed, as in a cylindrical case. They are small Mollusca, from the Indian Ocean( 4). ORDER III. INFEROBRANCHIA T A. The lnferobranchiata have nearly the same form and or- (1) Dorisajfinis, Gm., Cavol., Polyp. Mar., VII, 4. (2) Limax tergipea, Forsk.. XXVI, E, or Doria lacinulata, Gm.;-.Dori8 maculata, Lin. Trans., VII, vii, 34;-Doris pcnrw.ta, Bomm~, Act. Fless., I, iii, 3? (3) Buairis griseus, Risso, Hist. Nat. Mar., IV, pl. i, f. 6. · (4) In the species known (Placobranchus Ha~aelti, Cuv. ), the branchialstriz are green, and the body a brown-grey sprinkled with little ocelli, Van Hauelt., Bul· let. Univ ., Oct., 1824, p. 240. Messrs Quoy and Gaymard found it !Lt the Friendly Islands. |