974 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
The ligament reaches only the distal part of the chondrophore, which is occu- 
pied by the resilium. 
Leda (Jupiteria) pontonia Dat. 
Leda pontonia Dall, Proc. U. S. Nat. Mus., 1889, 12, p. 257, pl. 13, figs. 5, bb. 
List or STATIONS. 
Station. Locality. Fathoms. Bottom. Temperature. 
2808 Off Galapagos Ids. 634 coral sand 39°.9 F. (types). 
3360 Gulf of Panama. 1672 sand 369.4 
3393 JAM A 1020 green mud 369.8 
2923 Off San Diego, Cal. 822 i di 8990.2 
Leda (Jupiteria) excavata Hiwps. 
Nucula excavata Hinds, P. Z. 8. London, 1843, p. 100; Zool. Voy. Sulphur, 1844, 
Moll., p. 04, pl. 18, fig. 17. 
Panama, in 30 fathoms, mud; Hinds. U. S. S. ‘ Albatross,” station 2794, in 
62 fathoms, sand, bottom temperature 599.5 F. U, S. N. Mus. 122,763. 
By the emphasis on the posterior carinae visible in this species it begins to ap- 
proach Lembulus. 
Leda (Jupiteria) elenensis SowrrBr. 
Nucula elenensis Sowerby, P. Z. S. London, 1832, p. 198; Hanley, Thes. Conch., 3, 
Mon. Nuculacea, p. 121, pl. 228, fig. 71. 
U.S. $. * Albatross,” station 2805, in 52 fathoms, mud, Panama Bay. 
This species approaches Z. acuta Conrad, but is less attenuated. According to 
Hanley the surface sculpture is subject to much variation. 
Leda (Jupiteria) acrita Darr, n. sp. 
Shell small, white or translucent, with a very pale straw-colored periostracum, 
subequilateral, swollen, acutely rostrate behind; beaks prominent, adjacent; an- 
terior dorsal margin gently areuate; posterior slope straight, the opposed margins 
of the valves slightly pouting in the middle of a longitudinally striate, depressed 
escutcheon, bounded by two well-marked but not acute radial ridges; these ter- 
minate at the slightly gaping posterior end; a shallow radial sulcus, sometimes 
accompanied by a faint ray, extends from the beaks to the anterior basal margin, 
with variable strength ; middle of the valves prominent, with a variably strong 
series of short ripples from the beaks to the margin, these ripples absent or obs0- 
