NO. 2331. WEST AMERICAN MOLLUSKS—BARTSCH. 169 



long, Avell rounded, marked like the spire. Aperture large, pos- 

 terior angle obtuse, slightly effuse at the junction of the inner and 

 basal lip; outer lip thin; inner lip slender, oblique, and appressed 

 for the greater part, to the base, the anterior portion only being free ; 

 parietal wall covered by a thick callus, which renders the peritreme 

 complete; operculum typical. 



The type. Cat. No. 332121, U.S.N.M., and 350 additional spec- 

 imens, were collected on Bryozoa at the breakwater at Venice, 

 California. The type has five and one-third wdiorls and meas- 

 ures — altitude, 2.2 mm. ; diameter, 1,2 mm. 



BARLEEIA SUBTENUIS Carpenter. 



Plate 13, fig. U. 



1856. llydrobia ulvae Carpexter, Cat. Mtiz. Shells, p. 361. 

 1864. Barlecia stibtennis Carpenter, Kept. Brit. Ass. Adv. Sci., 1863, pp. 

 546, 623, 656, 669. 



1864. Barlecia suhtenuis 'i var. rimata Carpentek, Kept. Brit. Ass. Adv. 



Sci., 1863, p. 656. 



1865. Barlecia subtcnms Carpenter, Jouru. de Conchyl., vol. 12, pp. 143-144. 

 1865. BarUeeia {? subtenuis, var.) rimata Carpenter, .Journ. de Conchyl., 



vol. 12, p. 144. 

 1865. Rissoa cooperi Tryon, Auier. .Tourii. Conch., vol. 1, p. 222, pi. 22, 

 lig. 13. 



Shell oval, pale brown. Nuclear turns two, well rounded, marked 

 by numerous fine pits, which are arranged in axial and spiral series. 

 Postnuclear whorls well rounded, almost appressed at the summit, 

 marked by slender, retractively slanting incremental lines, and numer- 

 ous fine, closely spaced spiral striations. Suture moderately con- 

 stricted. Periphery of the last whorl usually obsoletely angulated but 

 at times rounded. Base short, well rounded, usually with a narrow 

 umbilical chink at the columella. Aperture large, rather flaring; 

 posterior angle acute; outer lip thin; inner lip rather strongly 

 curved forming an acute angle at its junction with the basal lip, 

 appressed to the body whorl for about half its length, the anterior 

 half being free; parietal w^all covered by a thick callus which renders 

 the peritreme complete; operculum typical. 



The specimen figured is one of 147 bearing the catalogue number 

 56146, IJ.S.N.M., and comes from San Diego, California. It is a 

 typical specimen, having five and one-half whorls and measures — 

 altitude. 3 mm.; diameter, 2.7 mm. 



