no. 1617. NEW CRETACEOUS AND TERTIARY FOSSILS—ARNOLD. 389 
the angles concave, almost vertical, and being about equal in width to 
the distance between the sutural revolving line and the next line be- 
low; the upper angle is compressed into a raised line, while the lower 
angle is simply the junction between the convexly curved base and the 
concave, hearly perpendicular surface of the interangular space; ob- 
solete spiral lines are sometimes present on the upper surface of the 
whorls, especially near the suture; base minutely spirally striate; 
whole surface of whorls marked by numerous fine, posteriorly, down- 
ward-sloping, incremental lines; suture appressed, inconspicuous; 
umbilicus lacking, body whorl not angulate adjacent to it; aperture 
subcircular, the upper margin extending far in advance of the lower 
part. 
Dimensions.—Altitude, 23 mm.; latitude, 30 mm.; apical angle 
about 80°. 
Notes——This variety differs from the typical form, which.is from 
the Empire beds (upper Miocene) of Coos Bay, Oregon, by being 
relatively broader, less prominently spirally sculptured, and in hav- 
ing the revolving line on the upper surface much less prominently 
raised and situated above, rather than below the middle of the upper 
surface; in C. stantoni the upper surface is prominently angulated 
in the middle of the upper surface. The new variety also possesses 
a revolving rib just below the suture which the typical form lacks. 
Named for La Honda, near the type locality. 
Ty pe.—Decolleté specimen, L. S. J. U., No. 1079. 
Horizon.—Lower Purisima (upper Miocene portion). 
Locality —Santa Cruz quadrangle, San Mateo County, locality No. 
150, Pescadero Creek, just above mouth of Jones Gulch, 3 miles due 
south of La Honda. (J. F. Newsom, R. Arnold.) 
