OF MOLLUSCA. 201 



3. A. citrina, t. 151. f. 6. 



4. A. viridis, t. 151. f. 7. 



5. A. rufa, t. 61. f. 5. 



6. A. striata, t. 61. f. 3. 



7. A. cirrigera, t. 61. f. 1. 



8. A. ocellata, t. 179. f. 2. 



9. A. Euclorus, t. 179. f. 1. 



ft Shell external (p. 198). 



Fam. VII. LOPHOCERCIDjE. 



Body elongate. Head produced. Tentacula two, ear-like. Eyes 

 — f Gill regular, pectinate. Male organ on right side of nape, 



near tentacle ; female ? Mantle enclosed. Tail conical. Shell 



exterior, convolute. Teeth in numerous longitudinal series ; central 1, 

 distinct ; lateral numerous, similar, in an angular cross series. 



1. LOPHOCERCUS. 



Shell convolute ; spire rudimentary, subcentral. 



1. L. Sieboldii, t. 176. f. 3 ; Soideyet, Journ. de Conch. 1850, 225. 

 t. 10. f. 1, 2, 3, 15, 17. 



The tongue is exactly like that of Act eon in form and structure. 

 — Souleyet, Journ. de Conch. 1850, 228. t. 10. f. 9. Gill pectinate, 

 on left side of the mantle lobes. 



Mantle of Lophocercus enclosed. Foot elongate, produced and 

 attenuated behind ; the sides of the front expanded, bent up, and 

 covering the sides of the shell. Eyes sessile, behind the base of the 

 tentacles. The aperture of the male organs at the hinder part of 

 the base of the right tentacles ; of the female on the edge of the 

 branchial cavity (united by a groove ?) . Gill a transverse series of 

 simple isolated leaves, attached to the upper inner surface of the 

 respiratory cavity. 



2. Lobiger. 



Shell spiral, ovate ; spire small, apical. 



1. L. Philippi, t. 176. f. 1 ; Souleyet, Journ. de Conch. 1850, 223. 

 t. 10. f. 14, 18. 



B. Organs of generation close together in one tubercle (p. 191). 



§ Teeth in numerous longitudinal series, uniform (p. 204). 



Fam. VIII. PLEUROBRANCHID^E. 



Animal rounded, convex. Head not produced, hidden under the 

 edge of the mantle. Tentacles two, close, slit on the outer side ; 

 frontal veil more or less produced between the base of the tentacles 



