— 65 — 



Species examinalcB. 

 a. arcis lateralibus conspicuis. 



Chiton magnlficus Desh. Chili. 



„ granosus Frembl. - „ 



„ Cumingi Frembl. „ 



„ albülineatus Sowb. California. 



„ Pellis-serpentis Quoy. Australia. 



„ concentricus Reeve. -ri 



„ squamosus (L.) Chemn. Ind. Occ. 



„ assimllis Rceve. « 



„ foveolatus Sowb. Australia? 



„ excavatus Gray. Ind. Occ. 



„ fasciatus Wood. » 



„ Sieulus Gray. Mar. Med. 



Canariensis Orb. Ins. Canar. 



„ dispar Sowb. Panama. 



11 



b. areis lateralibus ineonspicuis. 

 Chiton marmoratus Chemn. Ind. Occ. 



„ Quoyi Desh. Australia. 



Sect. 2. Radsia Gray. 



Valvfe transversa, externae j lamina insertionis valvarum termina- 

 lium pluri-lobata, mediarum 2 — 4 lobata (valvarum 3 et 3 et 6 et 7, 

 3-vel 4-lobata, valv. 4 et 5, 2-vef 3-lobata)5 limbus squamis subro- 

 tundis glabris tessellatis conspicuis obtectus. 



Species examinatce. 

 Chiton sulcatus Gray. Ins. Gallipagos. 



„ Barnesii Gray. Chili. 



„ N. Sp. (c^rulescens Shuttl.) California. 



Sect. 3. Callochiton Gray. 



Valvfe transversae, externae ; lamina insertionis valvarum terminalium 

 plurilobata, mediarum 4-lobata j limbus squamulis minutisslmis rhombi- 

 formibus reticulatus. ^ 



Species examinata. 



Chiton laevis Pennant. Mar. Britann. 



Sect. 4. Ischiioradsia Shuttl. 



Valv« transversa, externa); lamina insertionis valvarum terminalium 

 plurilobata, mediarum 4 — 5 lobata j hmbus squamulis parvis applanatis 

 sulculatis obtectus. 



