— 10 — 
Species examinale. 
Chiton australis Sowb. Australia. 
» Magdalenensis Hinds. California. 
Sect. 5. Ischnochiton Gray. 
Valve transvers&, externe; lamina insertionis valvarım terminalium 
plurilobata, mediarum bilobata; limbus squamulis minutis applanatis sul- 
eulatis, interdum elongatis obtectus. 
Species examinale. 
a. Valvis latis. 
Chiton longieymba Blainv. Quoy. Australia. 
divergens Reeve. 
b2) N 
» squamulosus ©. B. Adams. Ind. Oce. 
en Rissoi Payr. Mar. Med. 
„ marginatus Penn. Mar. Britann. 
b. Valvis elongatis, subcordiformibus — an Sect. propria? 
Chiton alatus Sowb. Ins. Philipp. 
„ limaciformis Sowb. Peru. 
Sect. 6. Leptochiton Gray. 
Valve transvers®, externe; lamina insertionis valvarum omnium 
integra, obsoleta; limbus granis arenaceis vel squamulis minutissimis 
dense obsitus. 
Species examinale, 
Chiton asellus Chemn., Forb. et Hanl. Mar. Britann. 
„  Cajetanus Poli. Ins. Canar. 
„  mediterraneus (Gray) Reeve. = 
Sect. 7. Tonicia Gray. 
Valvs transvers®, externe; lamina insertionis valvarum terminalium 
plurilobata, mediarum bilobata; limbus corneus, levis vel glaber. 
Species examinate. 
Chiton fulvus Wood. Lusitania. 
„ elegans Frembl. Chili. 
» Swainsoni Sowb. Peru. 
„  erenulatus Brod. Panama. 
»  truncatus Sowb. Ins. Philipp. 
Sect. 8. Chx»topleura Shuttl. 
(Acanthopleura Sect. * et Sect. *** Gray ex parte.) 
Valv& transvers&, extern®; lamina insertionis valvarum terminalium 
