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Species examinalce. 

 Chiton australis Sowb. Australia. 



„ Wagdalenensis Hinds. California. 



Sect. 5. Ischiiochiton Gray. 



Valvse transversa, extcrnse; lamina insertionis valvarum terminalium 

 plurilobata, mediarum bilobata; limbus squamulis minutis applanatis sul- 

 culatis, interdum elongatis obtcctus. 



Species examinalce. 

 a. Valvis latis. 



Chiton longicymba Blainv. Quoy. Australia. 

 ^ divergens Reevc. „ 



Y, squaniulosus C. B. Adams. Ind. Occ. 



„ Rissoi Payr. Mar. Med. 



y^ marginatus Penn. Mar. Britann. 



t>. Valvis elongatis, subcordiformibus — an Sect. propria? 



Chiton alatus Sowb. Ins. Philipp. 



„ limaciformis Sowb. Peru. 



Sect. 6. Leptochitoii Gray. 



ValvsD transversae, externae^ lamina insertionis valvarum omniam 

 intcgra, obsoleta; limbus granis arenaceis vel squamulis mioutissirois 

 dense obsitus. 



Species examinalce , 

 Chiton asellus Chemn., Forb. et Hanl. Mar. Britann. 

 „ Cajetanus Poli. Ins. Canar. 



„ mediterraneus (Gray) Reeve. „ 



Sect. 7. Tonicia Gray. 



Valvse transversae, externae^ lamina insertionis valvarum terminalium 

 plurilobata, mediarum bilobata 5 limbus corneus, laevis vel glaber. 



Species examinalce. 

 Chiton fulvus Wood. Lusitania. 



„ elegans Frembl. Chili. 

 ^ „ Swainsoni Sowb. Peru. 



„ crenulatus Brod. Panama. 

 „ truncatus Sowb. Ins. Philipp. 



Sect. 8. Chaetopleura Shuttl. 



(Acanlhopleura Sect. * et Sect. *** Gray ex parte.} 

 Valree transversa;, externae^ lamina insertionis valvarum terminalium 



