6 CHITON. 



amiculatus. 12. Shell with eight kidney shaped 

 very brittle valves, covered with a rough co- 

 riaceous membrane. 



Chiton amiculatus. Pallas in Nova Acta Petrop. ii. p. 

 241. t. 7. f. 26 to 30. Gmelin, p. 3206. Wood's 

 Conchology, p. 13. 

 Inhabits the Kurile Islands. Pallas. 



Shell more than six inches long, and the valves kidney shaped 

 and imbricated. 



castaneus. 13. Shell with eight very smooth 

 chesnut valves, and the inside of a rose 

 colour. 



Chiton castaneus. Wood's Conchology, p. 13. t. 2. f. 2 and 

 3, and t. 3. f. 2 and 3. junior. 



Inhabits 



In Mr. Wood's figure, this shell is represented to be two inches 

 long, and about an inch and a quarter broad. Colour deep 

 chesnut, and obsoletely marked with transverse stria?. Mr. 

 Wood describes the marginal triangles to be uniformly de- 

 pressed near their insertion in the coriaceous border, and 

 says, that in a younger state the shell is of a lighter colour ; 

 and from the appearance of a small whitish spot at the sum- 

 mit of each valve, may be readily mistaken for a distinct 

 species. 



ruber. 14. Shell with eight valves slightly marked 

 with curved striae ; margin red. 



Chiton ruber. Linnazus Syst. Nat. p. 1 107. Chemnitz, 

 viii. p. 288. t. 96. f. 813. Schrueter Eint. iii. p. 499. 

 Gmelin, p. 3203. Wood's Conch, p. 14. 



Enc. Method, t. l6l. f. 6. 

 Variety. Red marbled with white. 



Chiton marmoreus. Fabiicius F. Grant, p. 420. 



Chiton, No. 1 i. Schroeter Einl. iii. p. 506. 



Chemnitz, viii. t. 96. f. 812. 

 Inhabits the North Sea. Limuens. 

 Shell about an inch long, of ratlter an oblong form, and the 



back is keeled ; the colour is generally of an uniform red, 



with a darker streak on the back bordered with white, but 



is sometimes marbled as in the above mentioned variety. 



