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 Miller in 1792. 
Risso’s figure and description, however, are hardly evidence enough taken with- 
out corroborative information. 
The L. acuta is abundant off the Carolina coast at moderate depths. 
Leda solidifacta Datu. 
Leda solida Dall, Bull. M. C. Z., TX. p. 126, 1881. (Nom. preoc. 7) 
Plate VII. Figs. 7a, 7b. 
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 so, the specific name may be modified to solidifacta. No additional 
specimens have been found. 
Leda subzquilatera Jerrreys. 
Leda subequilatera Jeffreys, P. Z. 8., 1879, p. 579, pl. lvi. 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. Jeffreys’ types, with 
which it has been compared. 
Leda hebes E. A. Smita. 
Leda intermedia Sars, Dall, Bull. M. C. Z., IX. p. 127, 1881. 
Leda hebes E. A. Smith, Chall. Rep. Lam., p. 234, pl. 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. 
