139 



29 mm." — Dall, Nautilus 13:100. 



Type locality: — off San Pedro, Cal., in 20-25 fms., on a valve 

 of Pecten diegensis (Mrs. T. S. Oldroyd). 



2005 Kelsey, F. W. 



Dredging in San Diego bay. Nautilus 13:101. 



2006 Zonitoides neomexicanus 



Cockerell & Pilsbry, Nautilus 13:114. Organ Mts., N. M. 



2007 Ensis californicus Dall. 



Off San Pedro Martin Island, Gulf of Cal., in 14 fms. Mon- 

 terey, Cal. 



2008 Siliqua patula alta 

 Bering Sea. 



Synonymy: — Cultellus costatus Sby. (non Say). 



2009 Siliqua media Gray. 



Okhotsk and Bering Sea, north to Arctic ocean. 



Synonymy: — Machaera costata Midd. — Siliqua borealis Conr. 



2010 Siliqua Nuttallii Conrad. 



Lituya bay, Alaska, south to Monterey, Cal. 



2011 Petricola cognate C. B. Adams. 

 Synonymy: — P. gracilis Desh. 



2012 Perticola denticulate Sby. 

 San Pedro, Cal. to Peru. 



Dall, Nautilus 13:121 gives an extended note on the synony- 

 my, including P. ventricosa Desh. — P. nivea and tenuis Sby. (in 

 part). — Psephis tellimyalis Cpr. 



2013 Epiphragmophora Bowersi 



Shell umbilicated, convex; epidermis olivaceous; spire slight- 

 ly elevated; whorls between 4 and 5, convex, gradually increasing; 

 suture well defined; aperture transverse, nearly circular; per- 

 istome whitish, thin, very slightly expanded at the basal portion, 

 at the columella broadly reflected, yet leaving the umbilicus en- 

 tirely open, showing within the whorls to the apex; base convex. 

 A well defined, moderately broad, light-chestnut band revolves 

 above the center of the body whorl, and is visible above the suture 

 on the whorl preceding the last; lines of growth close and dis- 

 tinctly marked. Greater diameter 13, lesser 10, height 6mm. 

 San Jacinto mountains, Riverside county, California." — F. W 

 Bryant, Nautilus, 13:143 (Mr 1900). 



Named in honor of Dr. Stephen A. Bowers, a pioneer in scien- 

 tific and other good work on the Pacific coast. 



2014 Epiphragmophora Harperi Bryant 



"Shell umbilicate, translucent, white; suture well defined; 

 spire a depressed cone composed of 5 regularly increasing convex 

 whorls, the first 3 smooth, the remainder marked by obscure, 

 closely crowded, oblique lines of growth; base convex; aperture 

 nearly circular, oblique; peristome thin, broadly expanded, and 

 reflexed at lower third of baso-columellar portion, its extremities 

 joined by an elevated ridge, bordering which is a somewhat tri- 

 angular callus bounded on the inner side by a ridge extending 

 from the middle of the base of the reflected portion of the peri 

 stome obliquely to the upper part of the basal whorl; width of 

 umbilicus about one-fifth greater diameter of shell. Numerous 

 dark microscopical lines extend from the peristome over the body 

 whorl nearly perpendicular to the lines of growth. Greatest 

 diam. 17, least diam. 14, alt. 9 mm. San Jacinto mountains, 

 California." — F. W. Bryant, Nautilus, 13:143 (Ap 1900). 



