MoUusca, ly Edgar A. Smith. 423 



Cardiuni ecldnatum^ Linn^. 



From 55 fatli. 



One young specimen, 10 raillim. in length. 



Cardium nihiimuinj Philippi. 



From 1000 fath. 

 One example only. 



Lyonsiella gemma^ Verrlll. 



Lyonsiella gemma, Verrill, Proc. U.S. Nat. Mui*. 1880, vol iii. p. 396; 

 Ball, Bull Mus. Comp. Zool Harvard, vol xii. p. 288 ; Smith, 

 ' Challeuger ' Lamellibrancliiata, p. 16G. 



From 1000 fath. 



One perfect right valve was obtained. 



Verrill's locality was oiF the east coast of the United States 

 in 487 fath. 



I cannot reconcile Verrill's description with the PeccMoUa 

 insculpta of Jeffreys, with which it has been united by Dall 

 {I. c. supra). The form appears to be quite different. In 

 L. insculpta the anterior end is narrowed, the -- 



posterior obliquely arcuate and broad. On %^ 



the contrary L. gemma is *' broadly rounded ;' 



anteriorly," and has the " posterior end \ , J 

 short, narrowed, and tapered to an obtuse v..:./' 



point " — terms exactly applicable to the single valve at hand. 



On comparison with a ' Porcupine ' example of L. in- 

 sculpta^ which very closely resembles the figure in the Proc. 

 Zool. Soc. 1881, pi. Ixx. fig. 4, the texture and surface 

 ornamentation are seen to be identical, excepting that there 

 are two or three extra radii. 



When extensive series of these two forms are available, 

 their outline may prove very variable and of little specific 

 importance. This I think is very likely to be the case. 



Verticordi'a sahquadrata^ Jeffr. 

 From 1000 fath. 



Cuspidaria [Cardiomya) Greenii^ sp. n. 



Shell small, fragile, subpellucid, narrowly rostrate pos- 

 teriorly; ventral outline regularly curved, but 

 finely dentate by the terminations of the radi- " -^^-^ 



ating ribs ; dorsal margin on both sides of the ■ "^^ 



beaks straight, subhorizontal, anterior por- '., 

 tion very short ; anterior outline of the valves 

 oblique, slightly arcuate ; radiating costellce about 30, those 



