no. 1617. NEW CRETACEOUS AND TERTIARY FOSSILS—ARNOLD. 38% 
slightly reflexed; outer lip simple; inner lip smooth; pillar narrow, 
slightly twisted, very feebly plaited externally, and sculptured by 
broadly waved incremental lines. 
Dimensions.—Length (of shghtly decolleté type), 90 mm.; lati- 
tude, 45 mm.; length body whorl, 62 mm.; length aperture, 44 mm.; 
length canal, 11 mm.; latitude canal, 8.5 mm. 
Notes——This beautiful species is characterized by its peculiarly 
tabulated whorls, deep channeled sutural groove, and obsolete spiral — 
sculpture. It bears a striking resemblance to Ancistrolepis magnus 
Dall, from the recent fauna of the north Pacific, but may be distin- 
guished from the latter by 1ts much longer, narrower canal. 
(’. stantoni is quite different from C. postplanatus Dall from the 
upper Miocene of the Bogachiel River, Clallam County, Washington, 
being distinguishable by its sutural canal, more sloping table, and 
obsolete instead of well defined spiral sculpture. 
It is apparently characteristic of the upper part of the Purisima 
and lower portion of the Merced formations, where it is usually not 
rare. 
The species is named in honor of Dr. Timothy W. Stanton, chief 
paleontologist, United States Geological Survey, whose work on 
the Mesozoic faunas is well known. 
Type.—Cat. No. 165475, U.S.N.M. (Locality No. 139.) 
Paratype.—lL. 5. J. U., No. 1088. (Locality No. 139.) 
Horizon.—Upper Purisima and lower Merced formations, Pliocene. _ 
LOCALITIES. 
Purisima formation (lower Pliocene portion).—Santa Cruz quad- 
rangle, San Mateo County, locality No. 139, Purisima Rock, seven- 
eighths mile east of Ano Nuevo Point (R. Arnold, W. R. Hamilton) ; 
locality No. 141, sea cliffs between the mouths of Tunitas and Pes- 
cadero creeks. (J. P. Smith, G. H. Ashley, R. Arnold, J. F. Newsom, 
and others. ) 
Merced formation, upper Pliocene.—Santa Cruz quadrangle, San 
Mateo County, locality No. 140, sea cliffs, immediately east of 
mouth of Ano Nuevo Creek, 2 miles east of Ano Nuevo Point (R. 
Arnold) ; also at locality A 11, in sea cliff, west of Capitola, Santa 
Cruz County, immediately east of the Santa Cruz quadrangle (G. H. 
Ashley, R. Arnold). 
