34 CHITON. 'CANOE-SHELL. 



the margin finely reticulate : color deep rufous-brown, often 

 variegated and marked with a yellowish line down the 

 back : smaller, narrower, and more convex than the last. 

 Scotland, West of England, and Dublin bay. v. v. 



3. Chiton cinereus. Ash-colored Canoe-shell. 

 'Dorset Cat. pi. 1. f. 4 Linn. Trans, viii. pi. 1. f. 3 



'Wood, pi. 3. f. 5. 



Shell with eight valves, nearly smooth, ridged down the 

 back and beaked, finely fringed round the margin, a little 

 reflected on the hinder angle at the base: color grey or 

 with a reddish tinge - length a quarter of an inch. 



It differs from the last principally in the margin, which 

 is not reticulate, but furnished with a fine frirnge. 'The 

 color is also of an uniform grey w T ith occasionally a faint 

 reddish tinge. The color of the Oh. Isevis is of a dark 

 -dusky red, which does not change after it is dead, as is evi- 

 dent from the specimens in our own cabinet, which have 

 been preserved for some years. Mr. Dillwyn, however, 

 has united the two species into one, under the assertion 

 that the Ch. laevis is red when alive, and grey when d'cad. 



Western coasts, and Dublin bay. v. v. 



4. Chiton punctatus. Punctured Canoe-shell. Fig. 10. 

 Shell with eight valves, raised, beaked, and margined, 



very convex, deep red, finely and distinctly punctured all 

 over. The valves being distinctly punctured in this spe- 

 cies seem to mark the only difference between it and the 

 Ch. Isevis, in which they are faintly but evidently striate 

 i only : size of the last. 



It is probable that the Chiton ruber, so very slightly 

 mentioned by Laskey in the Memoirs of the Wernerian 

 Society, as being transversely striate, is only the Ch. laevis 

 of a deeper color. 



Found by Mr. O'Kelly, at Portrnarnock, Ireland, v. m. 



5. Chiton, fascicukris. Tufted Canoc-sholl. Fig. 9. 

 Mvrtfagu, pi. 27. f. B Dorset Cat. pi. 1 . f. lLlnn. Traits. 



viii. pi. 1. f. 1 Wood, pi. 2. f. (J. 



Shell with ei^ht valves, finely shagreened but not di- 

 stinctly punctured, slightly ridged and beaked down the 

 back, the margin surrounded with tufts of whitish hairs, 



one 



