264 CHITONID^. 



Fig. 526. Shell cinereous, with dark clouds, long-oval with obtuse 



dorsal ridges, surface with elevated dots or granules, dis- 

 posed in longitudinal lines, except towards the margin, 

 where they are irregular and larger ; no visible concentric 

 striae ; triangular areas very indistinct, outer whorls small, 

 margin coriaceous, red. Length, one inch ; breadth, four 

 inches ; width of margin, six hundredths of an inch. 



Casco Bay. This very distinct species was taken from 



the stomach of a haddock in June, 1841. Only a single si)ccimen 



has been found, which is in the cabinet of J. W. Mighels. (^Mighels 



and Adams.} 



Grand Manan (^Stimpson). 



Oeniis AmiCULA, Gray. 1842. 



Mantle covered with scattered fascicles of hairs, and having two 

 series of setigerous pores ; gills posterior. 



Shell with the valves externally scarcely conspicuous, the exposed 

 parts small, sub-cordate, as broad as long. 



Amicula Emersonii. 



Fig. 19. 



Shell ovate-oblong, white ; valves reniform, each with a central cordiform, sculp- 

 tured area, the remainder covered with a dirty membrane, with two rows of 

 hairy tufts at the margin; anterior valve emarginate. 



Chiton Emersonii, Couthouy, Sillim. Journ. o. s. xxxiv. 217 (1838) ; Bost. Journ. Nat. 



Hist. ii. 83, pi. 3, fig. 10 (1838). — De Kay, N. Y. Moll. 16.5, pi. 10, %. 198. 

 Chiton vfstitiis, Sowerby, Zool. Journ. iv. 368 ; Conch. 111. fig. 128. 

 Amicula Emersonii, Stimpson, Check Lists, 4. 

 Chiton Emersonianus, Gould, Inv. 151, fig. 19. 



Shell ovate-ol)long, broadest Itchind ; of a light drab color ; valves 

 eight, kidney-shaped, the extremities being rounded and the poste- 

 rior margin deeply arched ; posterior valve narrowed and excavated 

 at the tip ; on the centre of each valve is a small, heart-shaped area, 

 beautifully sculptured with bead-like granules, three or four series 

 of which are parallel to its border, and the central ones on each 

 side are arranged in a somewhat concentric manner ; the beak is 

 elevated and pointed, and smooth or slightly striated ; the area on 

 the anterior valve is shaped like the valve. The remaining portion 



