76 



above and whitish below, but gives no anatomical data." — Dall, 

 Nautilus 14:92-93. 



1016 Pleurotoma hemphillii 



"(Drillia) Shell small, smooth, slender, polished; spire long, 

 subacute, rounded at apex; longitudinally marked with incon- 

 spicuous, oblique ribs, which are nearly obsolete on the body 

 whorl; number of whorls 7, with well defined sutural line, and 

 just below it a parallel impressed thread-like line; shell of an 

 opaque dingy horn color; incremental lines fine, marked in some 

 specimens with dingy white; mouth obliquely ovate, about one- 

 third the length of the shell; labrium produced, anteriorly some- 

 what thickened; sinus sutural, deep, calloused; columella thick- 

 ened at base; canal very short, somewhat produced and twisted; 

 one specimen shows obscure, revolving, impressed lines below 

 the swell of the body whorl; size quite uniform. Lon. .2 6; Lat. 

 .09 in. Habitat — Los Todos Santos bay, Lower California, where 

 several specimens were obtained by Mr. Hemphill, for whom I 

 have named this well marked species." — Robert E. C. Stearns, 

 Conchological memoranda No. 7 (28 Ag 1871); Cal ac pr 5: — tl, 

 f3 (7 Ap 1873). 



1017 Pleurotoma montereyensis 



"(Drillia) Shell small, rather solid, elongate, slender; spire 

 elevated, subacute; whorls, 7-8, moderately rounded; upper por- 

 tion of larger volutions somewhat concavely angulated; suture 

 distinct; color, dark purplish brown or black, surface covered 

 with rather coarse, inconspicuous, revolving costse, interrupted 

 on the body whorl by rude incremental lines; middle of upper 

 whorls and upper part of body whorl displaying 14-15 equidis- 

 tant, longitudinal, nodose, slightly oblique ribs, which are whitish 

 in the specimens before me (being somewhat rubbed on the larger 

 whorls) ; on the smaller volutions of the spire a puckering at and 

 following the suture suggests a second indistinct series of 

 nodules; aperture less than half the length of the shell; canal 

 short; terminal portion of columella whitish, slightly twisted; 

 posterior sinus, rather broad rounded, and of moderate depth. 

 Mean divergence about 26 degrees, Long. .67 in.; Lat. .24 in. 

 Habitat — Monterey, California, where the single specimen in my 

 cabinet was collected by Mr. Harford and myself in March, 1868. 

 This shell, in its general aspect, resembles the sombre colored 

 specimens of the Gulf of California and Panama." — Robert E. C. 

 Stearns, Conchological memoranda No. 7 (28 Ag 1871); Cal ac 

 pr 5: — t 1 f 2 (7 Ap 1873). 



1018 Pleurotoma luctuosa Hinds 

 San Pedro, Cal., to Mazatlan. 



1019 Pleurotoma tuberculifera Gray. 

 San Pedro, Cal., to Gulf of California. 



1020 Polygyra harfordiana J. G. Cooper. 

 Big Trees of Mariposa county, California. 



1021 Polygyra polygyrella Bland. 

 Montana and Idaho. 



1022 Polygyra roperi Pilsbry. 

 Shasta county, California. 



1023 Pomatiopsis intermedia Tryon. 



Eastern Oregon and Nevada to Santa Cruz, Cal. 



1024 Pompholyx effusa Lea. 



Shell roundly gibbous, rather thin, effuse, reddish horn-colored 

 or greenish, whorls 5, flattened above, concave below; aperture 

 subrotund, dilated, white within. Length 6, diameter 8 mm. 



Living: Pitt river, Modoc county, to Lake Tahoe, California. 

 Pyramid lake, White Pine, Nevada (Henry Hemphill). 



