CLASS GASTROPODA 
109 
last whorl, 15; of aperture, 10; major diameter of shell, 13; of aperture, 
7 mm. (Dali.) 
Type in United States National Museum, No. 122592. Type locality, 
Pacific Ocean, south of Unimak Island. 
Range. Known only from type locality. 
Family TRUNCATELLIDAE 
Genus TRUNCATELLA (Leach, 1818) Risso, 1826 
Shell minute, cylindrical, truncated; whorls striated transversely; aper¬ 
ture oval, entire; peristome continuous. Operculum corneous, subspiral. 
(Tryon, Structural and Systematic Conchology.) 
Type. T. truncatula Drap. 
Distribution. World-wide, mostly tropical. 
Truncatella stimpsoni Stearns, 1872 
Proceedings of the California Academy of Sciences, 4: 249. 
Shell cylindrical, solid, light reddish horn-color, or amber; shining, 
slightly decreasing in size toward apex; closely and strongly longitudinally 
ribbed, the ribs even, regular, and interrupted only by the suture; upper 
whorls wanting, remaining whorls, 4; aperture oval, somewhat oblique, 
slightly angulated above; peristome continuous, thickened and moderately 
angulated at its junction with the body whorl. Length of largest specimen, 
.22; length of aperture, .06 in. (Stearns.) 
Type in ? Type locality, False Bay, near San Diego, California. 
Range. Catalina Island, California, to Magdalena Bay, Lower Cali¬ 
fornia. 
Truncatella californica Pfeiffer, 1857 
Proceedings, Zoological Society of London, 111. Binncy, Terrestrial Air-breathing 
Mollusks of the United States, 4:28; PI. 79, figs. 20, 22. 
T. non-rimata, turrito-cylindracea, truncata, tenuiscula, leviter striata, 
parum nitens, pallide rubello-cornea; spira sursum vix attenuata; sutura 
simpliciter marginata; anfr. superst. 4 convexi, sensim accrescentes, ulti- 
mus basi non compressus; apertura verticalis, ovalis, superne vix angulata; 
perist. simplex, continuum, margine dextro expanso, superne sub-repando, 
columellari adnato. (Pf.) (Binney.) 
Shell imperforate, cylindrical, truncated at tip, thin and translucent 
with light striae, shining, amber-colored; spire in perfect state of the shell 
composed of about 10 whorls, of which 4 only are not deciduous; these 
are convex, increasing in size rather rapidly; aperture oval, vertical, 
rounded above; peristome simple and continuous, slightly expanded, its 
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