Call on a new Liinna-id-. 14^ 
placed in the cabinet of the state university, at Berkeley, where 
they may now be seen. 
At the time the shells were received a careful study was 
made of them, and figures drawn of the largest and best pre- 
served specimen. They were recognized as not belonging t» 
Pompholyx. Reference to them was not made in the report 
cited for the reason that they were extra-limital. It is now 
proposed to describe these specimens as the type of a sub-genus, 
not hitherto recognized, its sole species being dedicated to Dr. 
Charles A. White, of Washington, the veteran palaeontologist. 
POMPHOLOPSIS* WHITEI, Sllbg. et Sp.tlOV. 
Fisfs. i-x. 
Shell dextral, globose, rather solid, deeply umblicated; whorls 
3 — 3!/^, convex, body whorl very large; spire short, apex ob- 
tuse; aperture roundly ovate; peritreme continuous, forming a 
heavy callous on the parietal wall of the body- whorl. Growth 
lines inconspicuous, surface of the shell smooth; sutures rather 
irregularly impressed. 
Length 7.26 mm.\ diameter 8.13 w;//. This is the size of the 
largest of four or five specimens, Post-Pleioccne, Tassajara 
Hills, California. Prof. Gahb. 
The resemblance between this form and Po7npholyx cffusa is 
marked, but not less so are the differences. It is an umblicated 
shell, is heavier and larger, and comes from strata older than 
any in which Ponipho/yx-hix?, yet been recognized. The aper- 
tural characters are decidedly different, not at all effuse, and 
very regularly roimded ovate. Generic and specific characters 
are necessarily combined, but the umbilicus will distinguish it at 
once from any other similar Limnaiid. 
There are now two fossil and two recent, (if Avieria be ex- 
cepted) subgenera of limnaeid moUusca which resemble each 
other in important particulars — perhaps sufficiently to give the 
whole number rank as a subfamily. To facilitate comparisoai 
^ ^tyvnoXo'^-s —Pompholyx, a sub-genus of inollusca, opsis, aspect of. 
