CLASS GASTROPODA 
89 
Type in United States National Museum, No. 206848. Type locality, 
off Catalina Island, California. 
Range. Known only from type locality. 
Turbonilla diegensis Dali and Bartsch, 1909 
Plate 49, figs. 13, 13a 
Bulletin 68, United States National Museum, 31; PI. 2, fig. 13. 
Shell small, subdiaphanous to dingy white. Nuclear whorls two 
and one-half, helicoid, loosely coiled, decidedly elevated, about one-fifth 
immersed, having their axis at right angle to that of the later whorls. 
Post-nuclear whorls, moderately rounded, somewhat overhanging, the 
greatest convexity being on the lower third of the exposed portion of 
the whorls, traversed by fourteen broad, coarse and strong, oblique, and 
somewhat flexuous axial ribs on the fourth and seventh whorl and 
eighteen on the eighth. These ribs extend over the angulated periphery 
to the umbilical region, appearing fainter on the base; the deep inter¬ 
costal grooves terminate at the periphery, i.e., do not appear on the base 
as gouged out spaces, as they do posterior to the periphery, but simply 
as plain shallow grooves between the ribs formed by the raising of these 
above the general surface of the shell. The whorls slope rapidly toward 
the suture and are somewhat contracted and shouldered at the summit, 
thus marking a prominent subchanneled suture. Aperture large, broadly 
ovate, showing the axial ribs within; outer lip thin, subpatulous, shortly 
curved to meet the short, somewhat revolute, slightly twisted, columella. 
Length, 5.3; diameter, 1.7 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 130316. Type locality, 
San Diego, California. 
Range. San Pedro to San Diego, California. 
Subgenus Chemnitzia Orbigny, 1839 
Turbonilla hypolispa Dali and Bartsch, 1909 
Plate 49, figs. 5, 5a 
Bulletin 68, United States National Museum, 34; PI. 2, fig. 5. 
Shell broadly conic, yellowish-white. Nuclear whorls very small, two 
and one-half, forming a rather elevated helicoid spire, the axis of which 
is at right angles to that of the succeeding turns, in the first of which 
it is a little more than half immersed. Post-nuclear whorls well-rounded, 
slightly shouldered at summit, marked by very strong, sublamellar, pro- 
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