— 189 — 
Species examinale. 
a. areis lateralibus conspicuis. 
Chiton magnificus Desh. Chili. 
„ granosus Frembl. n 
„  Cumingi Frembl. n 
„  albolineatus Sowb. California. 
„ Pellis-serpentis Quoy. Australia. 
„ eoncentricus Reeve. » 
„  squamosus.(L.) Chemn. Ind. Ocec. 
assimilis Reeve. 
N» 
„ foveolatus Sowb. Australia? 
„ excavatus Gray. Ind. Oecc. 
fasciatus Wood. n 
Sieulus Gray. Mar. Med, 
„ Canariensis Orb. Ins. Canar. 
„»  dispar Sowb. Panama. 
b. areis lateralibus inconspicuis. 
Chiton marmoratus Chemn. Ind. Oce. 
»  Quoyi Desh. Australia. 
Sect. 2. Radsia Gray. 
Valve transversz, externe; lamina insertionis valvarım termina- 
lium pluri-lobata, mediarum 2—4 lobata (valvarım 2 et 3 et 6 et 7, 
3-vel 4-lobata, valv. 4 et 5, 2-vel 3-lobata); limbus squamis subro- 
tundis glabris tessellatis conspicuis obtectus. 
Species examinale. 
Chiton sulcatus Gray. Ins. Gallipagos. 
»  Barnesii Gray. Chili. 
» N. Sp. (cserulescens Shuti.) California. 
Sect. 3. Callochiton Gray. 
Valve transvers®z, extern® ; lamina insertionis valvarum terminalium 
plurilobata, mediarum 4-lobata; Jimbus squamulis minutissimis rhombi- 
formibus reticulatus. 
Species examinala. 
Chiton levis Pennant. Mar. Britann. 
Sect. 4. Ischnoradsia Shuttl. 
Valve transversz, extern; lamina insertionis valvarum terminalium 
plurilobata, mediarum 4— 5 lobata; limbus squamulis parvis applanatis 
sulculatis obtectus. 
