CHITON. 173 



Gray's species is therefore highly hypothetical ; especially since no 

 one seems to have seen Gray's type, and its generic characters are 

 wholly unknown. I have never seen a " glaucus green " specimen 

 of this species "white inside;" they are always blue. The change 

 of name made by Deshayes must be adopted on account of the 

 earlier C. viridis of Spengler. 



C. PELLISSEEPENTIS Quoy & Gaimard. PI. 37, figs. 14, 15, 16, 17, 



18. 



Shell oval, rather elevated, hardly carinated, the side-slopes some- 

 what convex. Surface lusterless. Color a rather dull and dingy 

 olive or olive-green marked with black along the ridge and on the 

 sides of some valves. 



The lateral areas are moderately raised and sculptured with 3 or 

 4 rows of distinct tubercles. Central areas having strong, irregular 

 growth wrinkles, and fine longitudinal riblets. Anterior valve larger 

 and much more elevated than the posterior, both being sculptured 

 with numerous regular rows of distinct tubercles, the rows increasing 

 by splitting. Posterior valve depressed, the low mucro in front 

 of the middle. 



Inside blue, indistinctly blotched with olive-green. Sutural- 

 plates rounded, the sinus broad and deep, smooth or hardly dentic- 

 ulate. Anterior valve having 12, central valves 1, posterior valve 

 12 slits ; teeth blunt, pectinated. Eaves broad. 



Girdle wide, alternately light and dark ; scales (pi. 37, fig. 17) 

 rather large and wide, often showing a slight tendency to carination 

 in the middle, microscopically striated. 



Length 80, breadth 23 mill. 



New Zealand. 



Chiton pelliserpentis Q. & G., Voy. de 1' Astrolabe, Zool. iii, Moll., 

 p. 381, t. 74, f. 17-22 (1834). DESK., in Lam., An. s. Vert, vii, p. 

 508 (1836). Chiton pellis-serpentis KEEVE, Conch. Icon., t. 15, f. 

 84. BUTTON, Cat. Mar. Moll. N. Z. 1873, p. 46 ; Man. N. Z. Moll. 

 1880, p. 111. HADDON, Challenger Polyplac., p. 22. 



This is one of the most abundant New Zealand Chitons. Its 

 sculpture is frequently obscured or lost by erosion. C. sinclairi is 

 closely allied, but it differs in color-pattern, in the polished central 

 areas, whilst the surface of pellis-serpentis is lusterless, and in the 

 sculpture of the central areas. The median valves of pellisserpentis 



