252 BULLETIN OF THE 



of Risso, briefly described and supposed to be this species, is better figured, and, 

 if the identification could be confirmed, is the oldest stable name for L. com- 

 mutata, although the latter had been referred to L. minuta of Miiller in 1792. 

 Risso's figure and description, however, are hardly evidence enough taken with- 

 out corroborative information. 



The L. acuta is abundant oflf the Carolina coast at moderate depths. 



Leda solidifacta Dall. 



Leda solida Dall, Bull. M. C. Z., IX. p. 126, 1881. (Nom. preoc. ?) 

 Plate VII. Fig8. 7 a, 7 b. 



Habitat. Station 21, 287 fms. 



This species is nearest L. concava Bronn, but is less rostrate, and has the 

 anterior side proportionally longer. The name solida is said to be preoccupied 

 in this group, though I have not been able to lay my finger on the place. If 

 this be scf, the specific name may be modified to solidifacta. No additional 

 specimens have been found. 



Leda subaequilatera Jeffreys. 



Leda subcequilatera Jeffreys, P. Z. S., 1879, p. 679, pi. Ivi. fig. 3. 



A single valve of this small and rare species was dredged at Station 253, 

 near Grenada, in 92 fms. It agreed very well with Dr. Jefi'reys' types, with 

 which it has been compared. 



Leda hebes E. A. Smith. 



Leda intermedia Sars, Dall, Bull. M. C. Z., IX. p. 127, 1881. 



Leda hebes E. A. Smith, Chall. Rep. Lam., p. 234, pi. xix. fig. 7, 1885. 



Habitat. Station 2, 805 fms. 



The opportunity of comparing the valves referred in my preliminary report 

 to L. intermedia, with authentic specimens of the latter, has shown that, though 

 similar, they are not identical. It would seem likely that they are adult speci- 

 mens of what Mr. Smith has described as L. hebes, from the same region. The 

 adults are more convex laterally and below, and somewhat more rostrated than 

 the young as figured by Smith. Than L. intermedia they are less inflated, 

 less rounded behind, less polished, and have more hinge-teeth, especially be- 

 fore the ligament pit. The striation confined to the middle part and basal 

 margin of the valves, and very distinct there, forms its most remarkable 

 characteristic. 



