554 PROCEEDINGS OF THE NATIONAL MUSEUM. voi,.xxiv. 
GANESA '.' PANAMENSIS, new species. 
Shell rather large for the genus, evenly, roundly turbinate, the 
nucleus lost, with about two and a half sul)sequent inHated whorls; 
suture distinct, the whorl in front of it narrowlj^ marginate; surface 
smooth, except for fine incremental lines, polished, with about ten 
faint grooves around the very narrowly perforate umbilicus; aperture 
rounded, simple, the outer lip sharp, the inner arcuate and slightly 
thickened, the body with a thin callus; operculum pale horn color, 
with about five whorls; the foot of the animal rather short, with several 
pseudopodial lateral rather stout filaments. Alt. of shell 4.5; max. 
diam. 4.75 mm. 
Dredged ))}' the U. S. Fish Commission steamer Albatross in the 
Gulf of Panama at station 3393, in 1.020 fathoms, mud; bottom tem- 
perature 36^8 F. U.S.N.M., 101)021). 
I have been somewhat puzzled where to place this little shell, which 
appears to agree in general form very well with G. nitidiuscula 
Jeffreys, as figured in the Proceedings of the Zoological Society of 
London for 1883. 1 have not seen this species; the other of the two 
originally described by Jeffreys is very distinct, having a continuous 
peritreme and the last whorl near the aperture often entirely free 
from the preceding whorl, while the surface is finely granular. This 
form I named Granlgyra., of which there are half a dozen species. I 
may add that the figure of Ganesa ( Granigyra) jwmnosa fFeff re3\s, in 
the publication above referred to, is exceedingly bad, as it agrees 
neither with the diagnosis given by Jefi'rej^s nor with his specimens. 
I do not thiidv that the interruption of the peritreme b}^ the surface 
of the penultimate whorl is a S3^stematic character of great impor- 
tance, since many species show this interruption in 3^outh and have a 
complete peritreme later; and sometimes even adult specimens appear 
to vary in this respect in the same species. Miss Bush's useful paper 
hardly carries the subject far enough to resolve all doubts. The dis- 
tinction between hei' genus Lissogt/ra and the older Ganesa., as aljove 
restricted, is not very clear. But until we know more of the anatoni}^ 
of these small creatures, there will, doubtless, be always more or less 
uncertainty about them. For the present, 1 shall refer this species to 
Ganesa provisionally. 
MARGARITES VORTICIFERUS Dall. 
Plate XXXIX, fi^s. 7, 8. 
Margarita rorticif era Dall, Proc. Cal. Acad. Sci., V, 1873, p. 59, pi. ii, figs. 4a-b. 
Southern portion of Bering Sea, Akutan Pass, and westward to Atka 
Island, Aleutians. U.S.N.M., 126758. 
The shell is of a salmon pink color varying in depth with the indi- 
vidual and its state of preservation. It is a characteristic member of 
the Aleutian subfauna. 
