CLASS GASTROPODA 
167 
at its termination, the middle portion concave and more or less rugose. 
(Tryon and Pilsbry, Manual of Conchology.) 
Type. Leptothyra carpcnteri Pilsbry. 
Distribution. In nearly all tropical and subtropical seas, but most 
numerous in the Pacific. 
Leptothyra carpenteri Pilsbry, 1888 
Tryon and Pilsbry, Manual of Conchology, 10:247; PI. 39, a, figs. 26-29. 
Shell small, globose, very solid, imperforate, spire conic, more or less 
depressed; suture moderately impressed; whorls five, slightly convex, the 
last decidedly deflected toward the aperture, encircled by about fifteen 
subequal spiral lirae, separated by interstices about as wide as the ridges; 
incremental striae generally strongly developed, causing the lirae to appear 
nodose or somewhat irregular, and the interstices to appear pitted; aper¬ 
ture oblique, pearly white within, about half the length of shell; columella 
arcuate, base obsoletely uni-, bi-, or tri-dentate; color red, ashen, or purple. 
Alt., 8; diam., 8-9 mm. (Pilsbry.) 
Type in Philadelphia Academy of Sciences. Type locality, California. 
Range. Sitka, Alaska, to San Diego, California, to Cape San Lucas. 
This is the shell that has been called Leptothyra sanguineus. 
Leptothyra lurida Dali, 1885 
Proceedings of the United States National Museum , 8:542. Tryon and Pilsbry, 
Manual of Conchology, 10: PI. 39, a , figs. 27-29. 
This form has a dull olivaceous cast, sometimes mottled with whitish. 
The sculpture is more compact and closer, the nacre less brilliant than 
that of Monterey specimens; they are also smaller on the average. (Dali.) 
Type in United States National Museum. - Type locality, Puget Sound. 
Range. Puget Sound to Cape San Lucas, Lower California. 
Leptothyra bacula Carpenter, 1864 
Proceedings of the California Academy of Sciences, 3:177. Tryon and Pilsbry, 
Manual of Conchology , 10. 
L. t. L. sanguineo jun . sed rufocinerea, sculptura obsoleta; anfr. iv. 
planatis, suturis vix distinctis, marginibus spirae valde excurvatis; lirulis 
obsoletis latioribus, et circa basim striis crebris, vix sculpta; apertura 
rotundata, declivi; columella vix callosa. Long., 0.08; long, spir., 0.06; 
lat., 0.14. (Carpenter.) 
Shell small, depressed-globose, solid, imperforate, rufus ashy; whorls 
four, slightly convex, rapidly increasing, obsoletely but regularly spirally 
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