144 Trans. Acad. Sci. of St. Louis. 
growth formed by the large anal sinus. Below the periphery 
the sculpture consists of coarse and close-set beaded lines, the 
one marking the posterior limit of the aperture larger and 
more conspicuous than the others. The beak is slender, with- 
out trace of the external,oblique ridgejof Cochlespiropsis, the 
columella straight or broadly and feebly arcuate and the aper- 
ture and canal combined are generally as long as the remainder 
of the shell or nearly so. The type is C. cristata Con., of 
the Vicksburg Oligocene, and the other species known to me as 
forming typical members of the genus are bella Con. and 
columbaria Ald., of the American Eocene, and fterebralis 
Lamk., of the European Eocene. I have not seen the living spe- 
cies, elegans and radiata, of Dall, upon which he founded An- 
cistrosyrinz, and my previous statement as tothe identity of 
the latter genus with Cochlespira rests upon the published 
opinion of Cossmann. If true, Cochlespira, Pleuroliria, 
Gemmula and Orthosurcula would be the only Eocene genera 
known to me as surviving to the present time. It is probable 
that the species described by Harris under the name Drillia 
dipta, will constitute the type of a distinct genus near Coch- 
lespira. The various minute species of Cochlespirella Csy. 
(Proc. Acad. Nat. Sci., Phila., 1903, p. 279) are left for future 
consideration. 
Protosurcula n. gen. 
In this genus and Hosurcula there is no trace of ribbing, 
and the moderately large species composing them may be 
considered allied more closely to the Cochlespira group than 
any other; the embryo in both is conical or conoidal and 
multispiral, and, in Protosurcula is generally very large and 
with conspicuous longitudinal riblets on the lower whorls. 
The collar below the suture is cariniform and the long fasciolar 
surface between it and the obtuse periphery is broadly con- 
cave and with fine spiral lines; below the periphery the spiral 
lyrae are rather coarse. The columella is straight and gen- 
erally simple, though sometimes having a strong plica above 
the middle. The spire tapers evenly to the apex and the 
beak is slender and frequently very long, the aperture and 
long straight canal combined being much longer than the 
