386 ° PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
the Empire beds (upper Miocene) of Coos Bay, Oregon, but may be 
distinguished from the latter by its smaller size, less prominently 
posteriorly angulated whorls, much broader axial varices, more regu- 
lar spiral sculpture, which consists of 9 major ribs covering the whole 
whorl instead of 9 more or less irregular ribs which extend only to 
the angle and are then replaced by obsolete spiral striz on the upper 
part of the whorl; sutural riblet also better defined in /. portolaensis. 
fF. portolaensis differs from F’. arnoldi Cossmann, 1903, (+ rugosus 
Trask, 1855, not of Lamarck), /’. robustus Trask, Ff. kobelti Dall, and 
other late Tertiary or Quaternary species from the west coast by its 
much broader, rounded spiral lines and less rugose incremental 
sculpture. 
Named for the village of Portola, n near which the species is found 
abundantly. 
Type.—Cat. No. 165473, U.S.N.M. (U.S.GS. locality No. 4665.) 
Horizon.—Purisima formation (upper Miocene portion). 
Localities.—Santa Cruz quadrangle, San Mateo County, locality 
No. 6, on Sausal Creek, one-half mile southwest of Portola (J. P. 
Smith, R. Arnold, and others) ; also occurs at about the same horizon 
at several localities in eastern Monterey County and western Fresno 
County (Homer Hamlin, R. Arnold) ; type-locality, U. S. Geological 
Survey No. 4665, Etchegoin (upper Miocene or lower Pliocene) © 
formation, White Creek, 19 miles northwest of Coalinga, Fresno 
County. 
Genus CHRYSODOMUS Swainson. 
CHRYSODOMUS STANTONI, new species. 
Plate XXXVII, fig. 4. 
Description.—Shell often attaining a length of 100 mm., broadly 
fusiform, moderately thin; spire well elevated; apex acute. Whorls5 
or 6; nuclear whorls unknown; others tabulate and.sharply angulated 
about one-third the width of the whorl from the posterior margin; 
surface of whorls below angle, slightly convex, nearly vertical, orna- 
mented by several wide spaced obsolete revolving ribs which are closer 
set and slightly better developed toward the base of the body whorl; 
revolving table convex, sloping at about 30° from the horizontal, 
bounded by two raised lines or narrow ridges, the one nearest the 
suture being the more prominent and separated from the latter by a 
deep channeled sutural groove; whole surface ornamented by faint 
superficial revolving lines and by numerous fine incremental lines 
which extend posteriorly from the suture across the revolving table - 
and then descend vertically to the suture below. Aperture broadly 
ovate, narrowing in front to a moderately broad, short canal which 
is equal in length to about one-fourth the Nera of the aperture, 
is almost as wide as long, and has a concave extremity which is 
