one BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
West coast of Colombia, in Panama Bay at station 2799, in 29} fathoms ; 
U. S. N. Mus. 110,686. Also at station 2805, Panama Bay in 51 fathoms; 
station 2792, off Manta, Ecuador, in 401 fathoms, mud, bottom temperature 
42°.9 F.; stations 2784, southern coast of Chile, in 194 fathoms, mud, tem- 
perature 51°.9, and 2783, in 122 fathoms, temperature 48°; and on the west 
coast of Patagonia, South latitude 51°12’, in 258 fathoms, mud, temperature 48°. 
An abundant, small and simple species unlike any other of the region, with a 
range of some 3600 miles in latitude. 
Ledidae. 
LEDINAE. 
LEDA ScHUMACHER. 
In reviewing the synonymy of this genus I find a correction necessary to the 
statement which appears in Trans. Wagner Institute, 3, p. 579. It is stated 
there that the type of the genus is Leda rostrata Montagu. The early writers 
confused various species of Leda together and the rostrata of Montagu was not 
the species figured by Chemnitz (VII, figs. 550, 551) and Schumacher, and 
which was named Mya pernula by Miller in 1779. Of this species rostrata is a 
synonym. The species described and figured by Montagu as Arca rostrata and 
accepted as Leda rostrata by Hanley (Mon. Nuculacea) is a Lembulus. The 
type of Leda should therefore be cited as Leda pernula Miller ( + L. rostrata 
Gmelin and Schumacher but not of Montagu and Hanley). 
Leda (Jupiteria) gibbosa Sowersy. 
Nucula gibbosa Sowerby, P. Z. S. Lond. 1832, p. 198; Conch. Icon., 1871, 18, Mon. 
Laeda, pl. 8, fig. 51. 
Leda gibbosa Orbigny, Voy. Am. Mér., 1846, Moll., p. 545. 
U.S. 5S. “ Albatross,” stations 2799, 2803, and 2804, in Panama Bay, in 26 to 
47 fathoms, mud. U.S. N. Mus. 96,307. Payta, Peru, Orbigny. 
This fine, large, but rather coarse, species attains a length of 35 and a maximum 
diameter of 14 mm. It has a well-marked pallial sinus rounded behind. Even 
when living the greater part of the periostracum is usually wanting. 
Leda (Jupiteria) callimene Datt, n. sp. 
Plate -1%7, figures 3, 4. 
Shell small, solid, plump, white, with a thin, pale brownish periostracum, 
equivalve, inequilateral ; beaks small, pointed adjacent, vertically incurved; 
lunule and escutcheon not present, though by the presence of a strong radial 
