MOLLUSCA. 781 
QUATREF. principally differs by the absence of the lateral prolongations of 
the foot, which Cuvier regarded as a third pair of tentacles in Molidia. 
See QUATREFAGES Ann, des Se. nat., 2e Série, Tom. x1x. Zoologie, pp. 
271—312, Pl. 11; comp. ALDER and Hanoook Annals of Nat. Hist. xiv. 
1844, pp. 125—129. 
Tergipes Cuy. (Amphorina QuATREF., and Psilocerus MENKE). 
Branchiz clavate or obovate, not numerous, placed in a double row. 
Tentacles four or two. 
Sp. Zergipes lacinulatus, Limax Tergipes ForsK., Icon. rer. natur. Tab. Xvt. 
fig. £; Tergipes psilocerus nob. L. Bommr, Verhandel. van het Zeewwsch 
Genootsh. 111. 1773, pp. 296—208, Pl. (p. 318) fig. 3; on the sea-wiers of 
the island of Walcheren. (This little animal certainly does not differ 
notably from Amphorina Alberti QuatR. Ann. des Sc. nat., 3e Série, I. 
Pl. m1. fig. 5, which, however, is smaller.) 
Comp. on Tergipes A. V. NorDMANN Versuch einer Monographie von 
Tergipes Edwardsii, Mém. de 0 Acad. de St. Petersbourg, savants étrangers, 
Tom. Iv. 1845, (given in part in Ann. des Sc. nat., 3e Série, v. 1846, 
pp. 109—160, Pl. 1.) The generic name of Tergipes rests on an observa- 
tion that the animal creeps on its back by means of the branchiz, which is 
very doubtful. 
Calliopea D’Orzteny. 
Comp. D’OrzBIGNy, GuERIN Magas. de Zool. 1817, Moll. Pl. 108 ; ALDER 
and Hancock Ann. of Nat. Hist. xi1. p. 233, MILNE Epwarps Ann. des 
Se. nat. 2e Série, XVIII. 1843, p. 33, Pl. x. fig. 2. 
Hermeea LOvEN. 
Comp. Ofversigt af Kongl. Vetensk. Akad. Férhandl. 1844, p. 50. 
Cavolina Bruc. 
C. Branchie dorsal, cloven, penicillate or arborescent. 
Flabellina Cuv. 
Glaucus ForsTER. Body elongate, posteriorly subulate or fili- 
form. Four short tentacles. Branchiz digitate or palmate, lateral, 
three on each side. 
Sp. Glaucus hexapterygius Cuv. Ann. du Mus. vi. Pl. 61, fig. 11, pp. 427— 
430 (Mém. sur les Moll. No. 6), R. Ani., éd. ill., Pl. 29, fig. 3; although 
the figure in BLUMENBACH ADh. naturh. Gegenst. No. 48, has eight and not 
six branchiz, Quoy and GAIMARD are of opinion that this species denoted as 
Glaucus atlanticus cannot be separated from the preceding, and that only a 
single species of it isknown ; comp. Voyage del’ Astrolabe, 11. pp. 279—283 ; 
also G. BENNETT always saw only six branchie ; he observed that the animal 
attacked and swallowed Porpite that were placed in a glass with it. The 
