Mollusca, by Edgar A. Smith. 423 
Cardium echinatum, Linné. 
From 55 fath. 
One young specimen, 10 millim. in length. 
Cardium minimum, Philippi. 
From 1000 fath. 
One example only. 
Lyonsiella gemma, Vervrill. 
LIyonsiella gemma, Verrill, Proc. U.S. Nat. Mus. 1880, vol. iii. p. 396; 
Dall, Bull. Mus. Comp. Zool. Harvard, yol. xii. p. 288; Smith, 
* Challenger’ Lamellibranchiata, p. 166. 
From 1000 fath. 
One perfect right valve was obtained. 
Verrill’s locality was off the east coast of the United States 
in 487 fath. 
I cannot reconcile Verrill’s description with the Peechiolia 
insculpta ot Jeffreys, with which it has been united by Dall 
(l.c. supra). he form appears to be quite different. In 
LL. 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 
Short, narrowed, and tapered to an obtuse 
point ”’—terms exactly applicable to the single valve at hand. 
On comparison with a ‘ Porcupine’ example of L. ¢n- 
sculpta, which very closely resembles the figure in the Proce. 
Zool. Soc. 1881, pl. 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. 
Verticordia subquadrata, Jeftr. 
From 1000 fath. 
Cuspidaria (Cardiomya) Greenit, sp. n. 
Shell small, fragile, subpellucid, narrowly rostrate pos- 
teriorly ; ventral outline regularly curved, but 
finely dentate by the terminations of the radi- g7 
ating ribs; dorsal margin on both sides of the 77 
beaks straight, subhorizontal, anterior por- “jie \\> 
tion very short ; anterior outline of the valves : 
oblique, slightly arcuate; radiating costelle about 30, those 
