188 CHITON-SCLEROCHITON. 



Chiton nigrovirens BLAINVILLE Diet. Sci. Nat. xxxvi, p. 538 

 (1825). HADDON, Challenger, Polyplac., p. 22. C. capeim* GRAY, 

 Spicil. Zool., p. 5 (1828). HANLEY, in Wood, Index Test. Suppl. 

 t. 1, f. 11. REEVE, Conch. Icon., t. 22, f. 151. KRAUSS, Die 

 Siidafric Moll., p. 37. 



C. TENUISTRIATUS Sowerby. PI. 38, figs. 27, 28. 



Shell oval, cariuated, the back elevated ; valves all over very 

 finely radially striated ; girdle scaly. 



Length 25, width 15 mill. (Sowb.} 



A neat little shell of a dark olive-green color, oval, elevated, 

 nearly smooth in appearance, but finely striated ; margin lighter 

 green than the rest of the shell; inside bluish-green. (Sowb.~) 



Habitat unknown (Mus. Staiuforth.) 



C. tenuistriatm SOWB., in Mag. Nat. Hist. 1840, p. 291 ; Conch. 

 Illustr., f. 135, 135. 



This is apparently a typical Chiton, closely allied to quoyi or 

 nigrovirens, but it seems to be more elevated than either. 



C. MAURITIANUS Quoy & Gaimard. PL 31, figs. 39, 40. 



Shell small, oval, elongated, the valves elevated, carinated, trans- 

 versely finely striated and having lateral areas over which the striae 

 pass. It is a very dark green, lighter at the ridge, and at the edge 

 of the girdle, which is covered with fine, close, rounded scales, and 

 marked with 18 brown bands. Branchial leaflets about 38 on each 

 side. Length 18, breadth 10, alt. 6 mill. 



Mauritius. 



C. mauritianus Q. & G., Voy. Astrol. iii, p. 397, t. 73, f. J-3. 

 Lepidopleurus mauritianus MARTENS, in Mobius' Reise nach 

 Mauritius, p. 300. 



Known only by the original description, which is far from being 

 satisfactory. The interior has not been described. It is a more 

 carinated species than C. quoyi, and the striation is in a different 

 direction ; the girdle also being banded with brown. 



Section SCLEROCHITON Carpenter, 1892. 



Sderochiton CPR., MS., in Dall, Proc. U. S. Nat. Mus. 1881, p. 

 284, 287, 289 (no type mentioned.) 



Teeth of the tail valve turned forward, blunt and pectinated ; 

 sinus smooth, not denticulate ; scales of girdle solid, striated, 

 separated. 



