148 INVERTEBRATA OF MASSACHUSETTS. 



A single specimen of this shell was found living, a few years 

 since, by Dr. Charles Pickering, at Phillips's Beach, and is now 

 in the Cabinet of the Academy of Natural Sciences at Philadel- 

 phia. It is a common British species. 



It is an inelegant shell at first sight, its clingy, dull surface present- 

 ing nothing attractive. But no one can fail to admire its beautiful 

 sculpture when viewed under the magnifier. The serrated, reflected 

 margin usually mentioned in descriptions, is merely a contraction of 

 the margin about the ends of the valves, such as we see in many 

 other species. 



It is allied to C. apicidatus ; but we find the lateral triangles as 

 much sculptured as the dorsal in this ; the dots are diamond-shaped, 

 and arranged in quincunx, and not bead-like, and arranged in series. 

 From our other species it is distinguished by its dead surface. 



Chiton fulminatus. 



Shell ovate-oblong, brownish or yellowish-red, variegated with 

 angular, whitish lines, and a series of whitish points along the 

 posterior margin of the valves ; surface minutely granulated ; 

 margin pubescent. '■^^^ 



State Coll., No. 134. Soc. Cab., No. 972. 



Chiton fulminatus, Couthouy ; Bost. Journ. JVat. Hist., ii. 80, pi. 3, f. 19. 



Shell oblong-ovate, rather flat ; color varying from bright-red 

 to yellowish or dark reddish-brown, with numerous, fine, zigzag, 

 whitish lines arranged over the whole surface, and a line of 

 six or eight whitish spots alternating with dark-red along the 

 posterior edge of each valve ; valves carinated and slightly 

 beaked, their surface covered with microscopic granulations ar- 

 ranged in quincunx ; to the naked eye smooth and shining ; di- 

 vision into triangular areas very indistinct ; lines of growth very 

 faint. Margin narrow, coriaceous, coated with a close, short 

 down, alternately red and white. Within white at the edges of 

 the valves, deepening towards the centre to a rose-color. Length 

 y\ inch, breadth ■^% inch. 



Found in the stomachs of fishes caught ofl^" Egg Rock, Co- 

 hasset, &c. 



