94 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Turbonilla kelseyi Dali and Bartsch, 1909 
Plate 49, figs. 16, 16a 
Bulletin 68, United States National Museum, 39; PI. 2, fig. 16. 
Shell small, semi-transparent. Nuclear whorls small, two and one- 
fourth, depressed, helicoid, having their axis at right angles to that of 
the succeeding turns, in the first of which they are about one-fifth im¬ 
mersed. Post-nuclear whorls moderately rounded, ornamented by some¬ 
what sinuous, slightly protractive, rounded axial ribs, which are lower 
and somewhat expanded at the slightly shouldered summits of the whorls; 
fourteen of these appear upon the third, sixteen upon the fourth, eighteen 
upon the fifth, 20 upon the sixth and seventh, twenty-two upon the eighth, 
and twenty-four upon the penultimate post-nuclear whorl of the type. 
Intercostal spaces only moderately impressed. Periphery of the last 
whorl well-rounded. Base moderately long, well-rounded. Aperture 
suboval, posterior angle obtuse; outer lip thin, showing the external 
sculpture within; columella short, stout, twisted, provided with a weak 
fold at its insertion. Length, 4.7; diameter, 0.9 mm. (Dali and Bartsch.) 
Type in United States National Museum, No. 46506. Type locality, 
San Diego, California. 
Range. Santa Barbara, California, to San Ignacio, Lower California. 
Turbonilla muricata Carpenter, 1856 
Plate 49, fig. 9 
Catalogue of the Collection of Masatlan Shells, 428. Bulletin 68, United States Na¬ 
tional Museum, 36; PI. 2, fig. 9. 
Shell elongate-conic, milk-white. Nuclear whorls three, forming an 
elevated helicoid spire, whose axis is at right angles to that of the suc¬ 
ceeding turns, in the first of which it is almost half immersed. Post- 
nuclear whorls moderately rounded, somewhat contracted at the suture, 
strongly shouldered at the summit, marked by very strong, slightly pro- 
tractive axial ribs, of which 14 occur upon the first to fourth and 16 upon 
the remaining turns. These ribs extend prominently to the summit which 
they render muricated. Intercostal spaces as wide as the ribs, deeply 
impressed, terminating at the periphery. Sutures very strongly marked. 
Periphery and base of the last whorl well rounded, smooth. Aperture 
rhomboidal; posterior angle obtuse; outer lip thin, showing the external 
sculpture within; columella slender, slightly twisted and curved. Length, 
2.3 ; diameter, 0.7 mm. (Bartsch.) 
Type in Liverpool Collection, British Museum. Type locality taken 
from Spondylus at Mazatlan, Mexico. 
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