CHITON. 259 



Shell oval-oMoag, convex, siib-cariiiated ; color grayisli or light- 

 chestnut ; valves eight ; anterior valve crescentic, with three or four 

 concentric lines, and numerous separate, elevated, equal, sub-equi- 

 distant dots, arranged somewhat in regular lines along 

 tlie margin ; the six following valves have, on their dor- ^'^1^* 

 sal triangles, from twenty to thirty longitudinal series 

 of elevated points, like beads, somewhat converging to- 

 wards the summit ; on the lateral triangles, which are 

 distinctly elevated above the dorsal triangles, are scat- 

 tered points like those on the anterior valve ; posterior ^ apiZiatus. 

 valve with the series of dots like the dorsal trianalcs, a 

 central tubercle, and the remainder with scattered dots like those 

 on the anterior valve. Margin coriaceous, with alternate stripes 

 of white and dusky pubescence. Length, one inch ; breadth, three 

 fifths of an inch. 



Inhabits the southeastern waters of this State, after passing Cape 

 Cod. I have received it from Nantucket and Martha's Vineyard. 

 It is found more abundantly along the coast of New York and New 

 Jersey. Dr. Jay found it in great numbers at Gardiner's Island. 

 South Carolina (^Ravenel, Say). 



This species, so accurately described by Mr. Say from a single 

 specimen sent him by Dr. Ravenel of Charleston, South Carolina, 

 cannot be confounded with any other. The beautiful and conspicu- 

 ous bead-like series of dots are not found on any other described 

 species, though they partially and inconspicuously appear on C. cin- 

 ereiis. On account of their arrangement, I had formerly indicated 

 the shell under the name of C. pectinatus. The recent publication 

 of Mr. Say's manuscript has established his name. The lines of 

 dots are not all of equal length, and sometimes they become so 

 blended as to form merely an elevated line, but they are generally 

 very definite. I have seen some British shells labelled C. ruber ^ 

 which have precisely the same sculpture ; but they are much more 

 elegant in marking, and are of a bright reddish brown or rose color. 

 They cannot be C. ruber, however, according to any description I 

 have seen under that name. 



Chiton cinereus. 



Fig. 22. 



Shell ovate, the valves oarinated across the middle, and pointed behind ; of a 

 dead cinereous or greenish color, and minutely shagreened; margin pulverulent. 



