

Shells 8, forming an imbricate series on tlie middle of the l)ackX ^'v''^ 

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



^/^* '^ 1. LoPHURA, n. 407. 



'^\u^^ 1. L. Inca. Chiton I., B'Orh. t. 208. f. 2. 



^ 2. L. Pellis serpentis. Chiton P., Quoi/, t. 18f). f. 6, t. 208. f. (J. 



3. L.? Ch., Suv'ujny, Eqypt, t. 2(W. f. 1. 



4. L. ? Chiton, 6V/iv>. Eqypt, t. 209. f. .'1 



5. L. tehuelcha. Chiton t., if Orb. t. 207. f. ."l 

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



7. L. ? islandica. Chiton i., Thienemann, MSS. t. 1.54. f. 5. 



2. CoREPHiuM, n. 416. 

 fyO^A^ I 1- C. ? Cuvier, t. 154. f. 6. 



«««- 



*^7; / 2. C? asellus, Forbes S,- Hanley, t. 268. f. 5. 

 i^oi^'^ [ 3. C"? ruber, Forbes ^ Hanley, t. 2CyS. {. 6. 



^jL<yi^ '^- AcANTnocnETES, n. 425. Acanthochitoua, Gray, 1821. 



//"[/(j J llelminthoehiton, sj)., Salter, 1846. 



"*^ I 1. A. fascicularis, Saviyny, Egypt, t. 209. f. 2. 



2. A. fasciculivris. 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 /.., Quoy, t. 207. f. 2. 



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



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



7. A. ? Krusenstei-n, t. 154. f. 4. 



> 7 h-yOlti ^* Chitonellus, n. 426. llelminthoehiton, sp., Sa//er, 1846. 

 '' 1. Ch. fasciatus, Q?*oy, t. 208. f. 5. 



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



,^^/^tr^ 7 iL Subclass II. Respiratory oryans ^Htriously formed. Gill exposed, 



Ijyr^^ or only sliy fitly covered by a fold of the mantle, or in the form 



'i'J^ "^ ^f ^ luny-like cavity. Hermaphrodite, ivith reciprocal impreg- 



lA^ i,-'^ nation. Ileterobranchiata, Gray, 1840. Opisthobranchiata, 



M.-Edw. 1846. 



Order III. Pleurobranchiata. 



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

 herma])hrodite, with reciprocal im])regnation. Shell s])iral. Adult 

 and larva shell bearing larva; furnished with deciduous cephalic tins. 



A. Normal. Gill on side of hack under fold of the mantle. Ani- 

 mal and foot elongate, for walking. 



I. Organs of generation far apart, tmited by a groove. Tecti- 

 branchia, Rang. 



Fam. 1. Philinidee. 



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

 (/t'Ky^t 'ii 10' forming a sqiuire frontal disk with lobes. 



