CHITON. 221 



local species. Fossil at Fort William (J. G. J.). Its 

 foreign distribution is entirely northern, viz. Spitz- 

 bergen, Greenland, Iceland, the Faroe Isles, Norway, 

 Sweden, and Denmark, in 10-150 f. (Torell, Konig, and 

 others) ; the coast of Russian Lapland, on the White 

 Sea (Middendorff) ; Massachusetts (Gould) ; New Eng- 

 land (Stimpson) ; and State of Maine, in the stomachs 

 of fishes caught in Casco Bay (Mighels) . 



This approaches C. cinereus nearer than any other 

 species : but it is narrower and higher, and of a uniform 

 yellowish- white colour ; it has a rather prominent ridge 

 and beaks ; the sculpture is finer, and not chain-like, but 

 irregularly disposed in a radiating and wavy manner ; 

 its margin is notched ; and the granulation of the girdle 

 resembles bead-work. Spiral Foraminifera (Discorbina 

 rosacea and Truncatulina lobatula) seem fond of attach- 

 ing themselves to the girdle. The fry have dispro- 

 portionately large beaks. My finest specimen is from 

 Scalloway, and measures ]%ths of an inch in length, and 

 half as much in breadth. 



It is the C. oryza of Spengler, C. aselloides of Lowe, 

 and C. sagrinatus of Couthouy. , . / 



Cr4*VedL*H**t*0 cir-r*t*- C-nn*) 



N*.i* 7. C. MARGINA'TUS *, Pennant. )>-< - &> 



C. marginatus, Penn. Brit. Zool. iv. p. 71, tab. xxxvi. f. 2. C. cinereus, 

 F. & H. ii. p. 402, pi. Iviii. f. 1 (as C. marginatus). 



BODY oval, pale fleshcolour: mantle thin, edged with a 

 narrow border of light brown : girdle of moderate breadth, 

 usually puckered on the inner side (owing to the contraction 

 of the mantle), covered with minute close-set roundish 

 granules, which lie evenly on the surface ; it is of different 

 colours, and often variegated by alternate patches of reddish- 

 brown and yellow ; margin thickly fringed with short but con- 

 spicuous spines of a yellowish tint : head thick, transversely 

 oval : mouth round and plaited : gills from 15 to 20 on each 

 side, triangular, apparently not continued behind the head : 



* Bordered. 



