82 KELLIAD.E. 



anterior extremity. Spoon-sliaped cavity for the cartilage very 

 deep ; on its anterior edge is the vestige of a short, widely diverg- 

 ing V tooth, which will seldom be found, as it is scarcely possible 

 to open the valves without destroying it. 

 On each side is a very strong, curved lat- ^ig. 392. 



eral tooth, with a ])it al)Ove it for the re- 

 ception of the tooth of the opposite side ; 

 the anterior tooth much longer than the 

 posterior, and supported beneath by a 



thickening of the shell ; striae on the teeth 



very faint. Witliin glossy-white ; muscu- c. daunatn. 



lar impressions profound, united by a sim- 

 ple pallial line which has a small semicircular sinus behind. 

 Length, one and three fourths inches ; height, one and one twen- 

 tieth inches; l)readth, seven tenths of an inch. 



Brought from Nova Scotia ( Willis) and from Grand and George's 

 Banks. I am not aware that it has actually been found in the 

 waters of this State. 



The distinctive marks in comparison with C. arctata are its 

 coarse, rouu'h exterior, its longer and uncut posterior side ; its very 

 peculiar outline when viewed from al)ove, on account of its breadth 

 anteriorly ; and its strong, curved, nearly smooth lateral teeth. Mr. 

 Hanley has decided that the shell described l)y Turton under this 

 name was not a British shell, l)ut was introduced from America, 

 and is identical with the shell since described as C. Jauresii. 



Family KELLIAD^E. 



Shells minute, equivalve, hinge very variable, pallial impression 

 without sinus ; animal with only one siphonal opening (anal) ; man- 

 tle anteriorly folded into a tube ; foot grooved ; branchial leaflets 

 separate. 



Oemis KELI.IA, Turton. 1822. 



Shell somewhat globular, equivalve, closed ; hinge with two ap- 

 proximate teeth and a remote lateral tooth in one valve, and a con- 

 cave tooth and a remote lateral one in the other; pallial scar entire. 

 Animal with closed mantle, with a single elongated siphon and 

 lanceolate foot. 



