94 



Fam. 13. Chitonidce, p. 1(58. 



Shells 8, forming au imbricate series on the middle of the back. 

 Gills in two series, one on each side the hinder part of the body. 



1. Lophura, n. 407. 



1. L. Inca. Chiton I., D'Orb. t. 208. f. 2. 



2. L. Pellis serpentis. Chiton P., Quoy, t. 189. f. 6, t. 208. f. 6. 



3. L.? Ch., Savigny, Egypt, t. 209. f. 1. 



4. L. ? Chiton, Savig. Egypt, t. 209. f. 3. 



5. L. tehnelcha. Chiton t., D'Orb. t. 207. f. 3. 



6. L. Isabella. Chiton I., D'Orb. t. 207. f. 1. 



7. L.? islandica. Chiton i., Thienemann, MSS. t. 154. f. 5. 



2. Corephium, n. 416. 



1. C. ? Cuvier, t. 154. f. 6. 



2. C? asellus, Forbes Sf Hanley, t. 268. f. 5. 



3. C? ruber, Forbes Sf Hanley, t. 268. f. 6. 



3. Acanthochetes, n. 425. Acanthochitona, Gray, 1821. 



Helminthochiton, sp., Salter, 1846. 



1. A. fascicularis, Savigny, Egypt, t. 209. f. 2. 



2. A. fascicularis. Chiton f., Philippi, 1. 154. f. 2; Deshayes, t. 207. 



f. 6. 



3. A. monticularis. Chiton m., Quoy, t. 207. f. 4, t. 208. f. 1. 



4. A. zelandicus. Chiton z., Quoy, t. 207. f. 2. 



5. A. violaceus. Chiton v., Quoy, t. 208. f. 3. 



6. A. Garnotii. Chiton G., Quoy, t. 207. f. 5. 



7. A. ? Krusenstern, t. 154. f. 4. 



4. Chitonellus, n. 426. Helminthochiton, sp., Salter, 1846. 



1. Ch. fasciatus, Quoy, t. 208. f. 5. 



2. Ch. larviformis. Chiton 1., Blainv. t. 208. f. 4. 



Subclass II. Respiratory organs variously formed. Gill exposed, 

 or only slightly covered by a fold of the mantle, or in the form 

 of a lung-like cavity. Hermaphrodite, with reciprocal impreg- 

 nation. Heterobranchiata, Gray, 1840. Opisthobranchiata, 

 M.-Edw. 1846. 



Order III. Pleurobranchiata. 



Gill forming a tuft on the side under a fold of the mantle. Animal 

 hermaphrodite, with reciprocal impregnation. Shell spiral. Adult 

 and larva shell bearing larvae furnished with deciduous cephalic fins. 



a. Normal. Gill on side of back under fold of the mantle. Ani- 

 mal and foot elongate, for walking. 



1. Organs of generation far apart, united by a groove. Tecti- 

 branchia, Rang. 



Fam. 1. Philinidm. 



Teeth, central none, lateral 1 or 2, large, hooked. Tentacula 

 forming a square frontal disk with lobes. 



