70 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
and about 24 on the last whorl, the interspaces becoming more cord-like 
near the canal and sometimes feebly nodulous where the lines cut the ribs; 
axial sculpture of (on the penultimate whorl about 18) feeble narrow ribs, 
stronger near the apex, obsolete on the last whorl, with wider inter¬ 
spaces, beginning in front of the fasciole, hardly reaching the base, and 
protractively oblique; there are also fine sharp incremental lines chiefly 
evident in the depressions, but here and there finely reticulating the inter¬ 
spaces ; aperture rather wide, anal sulcus conspicuous, rounded; outer lip 
thin, prominently arcuate, smooth within; inner lip with a thin layer of 
brownish enamel, the edge raised anteriorly; canal distinct, slightly con¬ 
stricted, with a small concentrically siphonal fasciole. Height of shell, 18; 
of last whorl, 10; diameter, 6 mm. (Dali.) 
Type in United States National Museum, No. 216748. Type locality, 
Station 203, off San Pedro. 
Range. San Pedro and the Santa Barbara Islands, California. 
Genus CLATHRODRILLIA Dali, 1918 (Drillia) 
For the generally brown or brownish clathrate species, a few of 
which are found in nearly every fauna, and of which Pleurotoma gibbosa 
Reeve may be specified as a typical example, the new name of Clathrodrillia 
Dali may be used. (Dali.) 
Type. Pleurotoma gibbosa Reeve. 
Distribution, on west coast, Bering Strait to San Pedro, California. 
• 
Clathrodrillia renaudi Arnold, 1903 
Paleontology of San Pedro , 208; PI. 8, fig. 5. 
Shell small, fusiform, turreted; apex blunt; whorls eight, sharply 
angular, with angle about two-fifths distance from anterior margin of 
whorl; upper and lower surface flat, about fifteen oblique nodes ornament 
the angle and extend down on the lower portion of the whorl, becoming 
obsolete before reaching the suture; nodes obsolete on body-whorl; suture 
deeply impressed, distinct; aperture short, elliptical, oblique; posterior 
sinus shallow; anterior sinus long, straight; columella incrusted within; 
body-whorl angular, ventricose, much produced and narrow below, smooth, 
except for very faint incremental lines. Long., 15.8; lat., 6; body-whorl, 
9; aperture, including canal, 7 mm. (Arnold.) 
Type in United States National Museum. Type locality, Pliocene of 
San Pedro, California. 
Range. Known only from type locality, recent and fossil. 
[ 70 ] 
