16 CHITON. 



the back of the shell, which is occasionally interrupted 

 with chesnut, terminates in a white triangular spot on 

 the posterior valve. The back is convex, not carinated, 

 and is delicately striated in the direction of the margin. 

 The inside is whitish. Its country is unknown. 



TUFTED CHITON. 

 PI. 2. /. 6. Mrs. Mawe. 



19. Chiton facicularis. Ch. testa octovalvi, corpore ad valvulas utrinque 

 faciculato. Linn. Syst. Nat. p. 1106. Gmelin. p. 3202. 



Shell of eight valves,-body with a tuft of hair on each side of the valves. 



Chem. Conch. 10. t. 173. f. 1688. Encyclop. Method, t. 163. f. 15. Mont. 

 Test. Br. p. 5. Svppl. pi. 27. f. 5. Linn. Trans. 8. p. 21. pi. 1./. 1. 



This shell is slightly keeled. The valves, on the 

 upper part are cinereous marked with black ; when 

 magnified, they appear like shagreen : a hairy tuft pro- 

 ceeds from the lower portion of each valve, which is 

 quite smooth, like horn, and of a yellowish colour ; the 

 margin is broad and coriaceous. The hairs frequently 

 fall off when the shell is dried, and leave the marks only of 

 insertion. This species is about an inch long and half 

 as broad. Inhabits Barbary and is also found in the 

 British seas, but of a smaller size. 



FURROWED CHITON. 

 PL 3./. 1. Mrs. Robinson. 



20. Chiton sulcatus. Ch. testa octovalvi crassa convexa sulcata, limbo lot* 



squamuloso. 

 Shell of eight valves thick, convex and sulcated, margin broad and scaly. 



A thick shell deeply grooved in every part ; the ex- 

 treme valves are furrowed from centre to margin, and 



