288 DESCRIPTIONS OF NEW CHITONS. 



ing backward, and their lateral areas scarcely distinguished : 

 numerous slightly curved spines, nearly ^ an inch long, cover 

 the margin ; general colour like a faded leaf, with dark 

 patches of reddish brown covering the lateral, and part of 

 the central areas of some of the valves, and a dark dorsal 

 band bordered by bright green and white. 



Chiton alternatus. (Con. lUus.* fig. 141). 



Ch. testa elongata, subdepressa, minutissime granulata ; costa central! 

 leviter carinata ; areis lateralibus costa lateral! separatis ; valva antica 

 radiat!m costata ; post!ca parva ; margine sp!n!s minut!s !nstructo, nigro 

 alboque alterne fasciato. Long. J^ ; lat. i|, poll. 



Japan. Mus. Cum!ng. 



Narrow, rather flat, minutely granulated ; the first valve is 

 radiated with slightly raised ribs, the intermediate have each 

 three faint ribs, one dorsal, the other two lateral ; the last is 

 very small, with a nearly terminal apex ; the margin is co- 

 vered with very minute spines, in alternate patches of black 

 and white ; general colour dark olive green. 



Chiton pectinatus. (Supp. PI. xvi. fig. 3). 



Ch. testa elongata, subcarinata ; valvis recHnentibus, retus!s, radiatim 

 costatis ; areis lateraUbus ex!gu!s valde elevatis ; marg!ne spin!s brev!ss!m!s 

 obtus!s !nstructo. Long, li ; lat. ^, poll. 



Cape of Good Hope. Mus. Stainforth. 



This species differs from Ch. limaciformis in being 

 strongly ribbed, and from Ch. retusus, in not being fascicu- 

 lated. It is elongated and narrow, with strongly relieved 

 lateral areas, as in both those species ; it is strongly pecti- 

 nated ; the valves are obtuse, and lean towards the posterior 

 extremity, the apex of the last valve being nearly terminal. 

 The margin is narrow, and covered with short blunt spines. 

 Colour brownish white, variegated with reddish spots. ^. 



Chiton Watsoni. (Con. Illus. fig. 81, 130). 



Ch. testa elongata, tenuissime radiatim striata ; dorso rotundato ; valvis 

 ad latera disj unctis ; areis lateralibus paulo elevatis, angustis ; margine 

 setis numerosis nigris instruct©. Long. 2$ ; lat. 1^, poll. 



Cape of Good Hope. Mus. Watson. 



Quoy and Gaimard have described this shell in the ' Voy- 

 age de r Astrolabe,' under the the name of Ch. casta?ieus, 

 which name being pre-occupied, I have taken the liberty of 



' Concliological Illustrations, by G. B, Sowerby, Jun, 



