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Show 310 MOLLUSCA. is that of a parasite( 1 ), like the Pagu1·us Bemhardus, for instance. As it is always found in the same shell, ~o.wever, and as no other animal is ever seen there(2), although 1t l S very common and so formed as to show itself frequently on the surface, and as the germ of it is visible even in the ovum of the Arg·onaut(3), this opinion must be considered as highly problematical, to say nothing more of it. The ancients were well acquainted with this singular animal and its maneuvres. It is their Nautilus and their Pompilua, Pliny, IX, c. xxix. Several species are known, closely resembling each other both in the animal and the shell, which were united by Lin· meus under the name of .l11·gonauta argo, or the Paper Nautilus( 4). BELLOROPHON, Montf. Certain fossil shells, so called, the animal of which is supposed to have been analogous to the Argonauts. They are spirally and symmetrically convoluted, without septa, but thick, and not fluted; the last whorl proportionably shorter( 5). LoLIGO, Lam. An ensiform lamina of horn in the back in lieu of a shell; the sac has two fins, and besides the eight feet promiscuously loaded with little cups on short pedicles, the head is furnished with two much longer arms, provided with cups near the end only, which is widened. The animal uses these latter to keep itself immovable, as if at anchor. The receptacle of the colouring matter is lodged in the liver, and the glands of the oviducts are very large. 'fhe co· alescing eggs are deposited in narrow garlands, and in two rows. They are now subdivided according to the number and armature of the feet and the form of the fins. ( 1) It is upon this hypothesis that M. Itafin. and others have formed the anim~ into the genus OcYTHOE. (2) All that has been stated to the contrary, even in modern times, is founded upon report and conjecture. , . (3) Poli, Test. Napol., III, p. 10. See, also, Ferussac, Mcm. de la Soc. d Hist. Nat., II, p. 160, and Ranzani, Mem. di Stor. Nat. dec., 1, p. 85. (4) .B.rg. argo, Favanne, VII, A, 2, A, 3;-.llrg. haustrum, Delw., lb., A, 5;-J. tuberculata, Shaw, Nat. Misc., 995;-.B.. navicula, Solander, Fav., VII, A, 7;-.R.. Mans, Sol., Fav., VII, A, 6;-.11. Cranchii, Leach, Phil. Trans., 1817. (5) Bellorophon vaaulites, Montf., Conch. Syst., I, p. 51. See, also, Defrance, Ann. des Sc. Nat., I, p. 264. CEPHALOPODA. 311 LoLIGOPSis, Lam. Or the Calma1·eta, should have but eight feet as in Octopus; they are only known, however, by drawings of but little authority( 1 ). In the true Loligo the long arms are furnished with cups like the other tentacula, and the fins are placed near the point of the sac. Three species are found in the European seas. L. vulgaris; Sepia !oligo, L.; Ronde!., 506; Salv. 169. Fins forming a rhomb at the bottom of the sac. L. sagittata, Lam.; Seb., III, iv. Fins forming a triangle at the bottom of the sac; arms shorter than the body, and loaded with cups for about half their length. L. media; Sep. media, L.; Ronde], 508. Fins forming an ellipsis at the bottom of the sac, which terminates in a sharp point(2). ONYKU., Lesueur.-ONYOHOTHEUTHis, Lichtenst. The long arms furnished with cups terminating in hooks; in other respects the form is the same(3). SEPIOI.A, Cuv. The rounded fins attached to the sides of the sac and not to its point. One species, 8. vulga7'is; 8. aepiola, L.; Ronde!., 519, inhabits European seas. The sac is short and obtuse, and the fins small and circular. It seldom exceeds three inches in length, and its horny lamina is as slender and sharp as a stilet. CHONDROSEPIA, Leukard.-SEPIOTHEUTEs, Blainv. The whole margin of the sac, on each side, bordered with the fins, as in Sepia; but the shell horny, as in Loligo( 4). (1) See, however, Leacltia cyclura, Lesueur, Ac. Nat. Sc. Phil., II, p. 89, and Krusenstern, Atlas, pl. lxxxviii. (2) Add, Lol. Bartramii, Lesueur, Ac. Nat. Sc. Phil., II, vii, 1, 2;-Lol. Bart· lingii, Id., XCV;-Lol. illecebrosa, Id., pl. F, No. 6;-L. pelagica, Bose., Vers., I, 1, 2;-L. Pealii, Lesueur, I, c, viii, 1, 2;-L. pavo, Id., XCVI;-L. bre:vipinna, Id., Ib., m, x. (3) On.. caribrea, Lesueur, Ac. Nat. Sc. Phil., II, i:x, 1, '2;-0n. angulata, Id., lb., I, 3;-0n. uncinata, Quoy and Gaym., Voy. Freycin., Zool., pl. vii, f. 66;-0n. Bergii, Licht., Isis, 1818, pl. xix;-On. Fabricii, Ib., Id.;-On. Banlc:Jii, Leach, App. Tuckey, pl. :xvlii, f. 2, copied Journ. de Phys., tome LXXXVI, June, f, 4;- 0n. Smithii, Leach, lb. f. 3, Journ. de Phys., lb., 5. (4) Oltondrosepia loligiformis, Leukard, App. Ruppel., pl. vi, f. 1. I \ |
