163 
teriorly; those of the median series are a little more suddenly 
rounded anteriorly than posteriorly; while those belonging to the 
supraperipheral cord are truncated suddenly posteriorly and slope 
gently anteriorly. The spaces between the spiral cords and axial 
ribs are small, moderately rounded, well impressed pits. Suture 
constricted, showing a portion of basal cord. Periphery of last 
whorl marked by a deep, spiral groove as wide as that separating 
the first supraperipheral cord from the median spinal cord, and, 
like it, crossed by the continuations of the axial ribs. Base short, 
well rounded, marked by a broad, spiral cord which is truncated 
posteriorly and slopes gently anteriorly toward the shallow well- 
marked groove which separates it from the base proper. Entire 
surface of spire and base marked by numerous, very slender, in- 
cremental lines. Aperture irregularly oval, very strongly chan- 
neled anteriorly; posterior angle obtuse; outer lip thin, showing 
the external sculpture within, rendered decidedly sinuous at the 
edge by the external sculpture; columella stout, moderately long, 
the edge reflected; parietal wall glazed with a thin callus.’’— 
Bartsch. 
2342 Columbella penicillata Cpr. 
2343 Odostomia helga Dall & Bartsch. 
2344 Modiolus opifex Say. 
2345 Eulima bitorta Van. 
2346 Turbeonilla buttoni Dall & Bartsch. 
The above were collected on San Geronimo Island, the follow- 
ing on Cerros Island. 
2347 Triton gibbosum 
2348 Conus gradatus Mawe. 
2349 Cymatium corrugatum Lam. (See 2557). 
2350 Latirus lugubris C. B. Adams. 
2351 Arca reeviana Orb. 
2352 Columbella fasciata Sby. 
2353 Ischnochiton acrior 
2354 Ischnochiton didymus Bartsch. 
2355 Ischnochiton clathratus 
2356 Ischnochiton conspicuus 
2357 Callistochiton crassicostatus 
2358 Callistochiton decoratus 
2359 Henderson, Junius: | 
Some Wyoming shells. Nautilus 27:37. 
2360 Orechelix hendersoni dakani 
Junius Henderson, Nautilus 27:38. 
Type locality:—near Newcastle, Colorado. 
2361 £Pilsbry, H. A.: 
Note on a new variety of Epiphragmophora tudiculata. Nau- 
tilus 27:49. Describes var. Grippi, with figures, and mentions the 
following named varieties:— 
2362-2368 Varieties cypreophila, umbilicata, convicta, subdolus, 
tularensis, binneyi, and grippi. 
2369 Oreohelix yavapai extremitatis 
Shell creek canyon, Shell, Wyoming. 
2370 Oreoheilx pygmza 
Same locality. Pilsbry, Nautilus 27:52. 
