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Show 366 EN'J;'OZOA. nected with the body by a short pedicle, and under its anterior margin are two small ones, between which,tnd somewhat posteriorly, is the mouth. A circular ramified vessel, the nature of which it is difficult to determine, is observable in the parenchyma of the body. T. coccineum, Cuv., a species more than an inch wide, and of a bright red colour, tltat attaches itself to the branchire of various fishes of the Mediterranean, such as the Orthagoriscus, Xiphias, &c.(1) One of the most extraordinary genera of this family is the HECTOCOTYLE, Cuv. Long worms, thickest and compressed at the anterior extremity, in which is the mouth, whose inferior surface is completely covered with numerous suckers arranged in pairs, to the number of sixty or a hundred; there is a sac on the posterior extremity with the folds of the oviduct. H. octopodis, Cuv., Ann. des Sc. Nat., XVIII, pl. xi. From four to five inches long, and with a hundred and four suckers or cups; it lives on the Octopus rugosus-Sepia rugosa, Boseand penetrates into its flesh. The Mediterranean. H. argonautre; Trichocephalus acetabularis, Delle Chiaie Mem., P· ii, pl. 16, f. 1, 2. Smaller and with but seventy suckers. It lives on the Argonaut. Here perhaps should come the genus AsPlDOGASTER, Brer. Where the venter is furnished with a lamina excavated by four ranges of fossulre. .9... conchicola, Beer., Ac. Nat. Cur. _XIII, P· ii, pl. xxviii. It is very small and lives on Muscles. ( 1) Lamartiniere found a similar but grey one on a Diodon near Nootka-Sound. It formed the genus CASP.ALA, Bose., Nouv. Bullet. des Sc., 1811, and tbatofPnYL· LINE, Oken, Zool., pl. x. See Journ. de Phys., Sept. 1787, pl. ii, f. 4, 5. We m:l.y unite to it the Tristoma elongatum, Nitzsch, Ol' NxTBCliiA, Ba:r., Ac. Nat. Cur., XIII, pars 11, tab. XXXII, f, 1-5. The AxtNE of the Belone, Abild., Soc. Nat. Hist. Copenh., 111, p. 2, pl. vi, f. 3, appears to be a Triatoma, with an extremely elon· gated body, very large posterior suckers, and very small anterior ones. PARENCllYMATA. 367 I cannot help thinking that we should I . Fasciola most of the auimals con ta.I ne d . a so approximate to In the genus PLAN ARIA, Mull.(l) Although they do not inhabit other . I or fresh water. Their bod . d amma s, but merely live in salt . . . y Is epressed parench without a distmct abdominal .t T ' ymatous, and the middle of the body or m cavi Y· . he oral orifice, placed under proboscis, leads as i; F ~rle posterio:Iy, and dilated into a little ' ascio a, to an mte t' h ramifications are formed in th e th.1 c k ness of st hme eb owd oseA n umerous network occupies the sides and b h. 1 . Y· vascular double system of genital ;r e ;c the ahme.ntary orifice is a coitus. Small black poi·nts ganbs. hey also enJOY a reciprocal are o servable wh' h b These animals are extreme! . ' tc pro ably are eyes. their own species The t y lvoraciOus, and do not even spare ner, but are reproduced y.ntho on y -'"m~l.tiply in the ordinary man- WI great tac1hty by di · · T experience spontaneous divisions. VISion. hey even Several species inhabit the fresh waters in Franc ( ) Others, and larger ones, are ver abun e 2 • of the same country(s). Y dant on the sea-coast The surface of some seems pilose(4). Several are furnished anteriorl with M. Duges separates from them they t\~o tentacula( 5). PROSTOMA, Where the anterior extremit . . posterior with another. y IS provided with an orifice, and the (lj At the• p eriod of my first ed1't 'w n 1. t was by · t genus Planarta here, having no su:ffi . , t . conJec w·e only that I placed the natural affinities. Since then the :~n an~tomical data to give me an idea of its ~allyell, Monog., Ba:r., Ac. N;t. Cur.,~~~~~:nse:f MM. R. Johnson, Phil. Trans., d adLe by myself, appear to confirm this c]assific!ti , Annh .. des Sc. Nat., XV, and those e amarck. on, w tch has been adopted b M (2) Planaria lactea, Zool Da C y . t spbecies described by M. Du.ges ':\~n IXd, lS, 2; NPZ. nigra, lb., 3, 4, and the other th'e long ca tal ogue of this genu' s, wh· iches M c".l l at., X.V ' pi . · lV. We find in Gmelin. IS(")sapvalnt's figw:es are copied in the Ency~. =e~:rttd~ularly has enriched; part of 0 • aurantiaca Cu o tque. (4) Pl. broccltii, Rlsso v. t (S.) Pl. cornut a, Mu" ll. ,. Zool Dan XX earmg the tentacula under~ ., XII, 5, 7. Some o£ them are form belong to this d'v' . ' he eye of the spectatot• The Pia ' ed by 1 ts1on. · noceres, Blainv., |
