>-o. 2295. xfj^T ]^rQjf2,j^ PACIFIC M0LLU8KS—DALL. 331 



Type-locality. — U. S. Fish Commission station 4322, off La Jolla, 

 San Diego County, California, in 110 to 199 fathoms, shelly mud. 



This species when fully adult prohably has a few denticulations 

 on the inside of the outer lip, and in fresh specimens the color may be 

 variable. All those obtained at this station were ''dead" shells. 



ASTYRIS AMIANTIS, new species. 



Shell small, pure white, solid, with seven moderately-rounded 

 whorls exclusive of the (lost) nucleus: suture distinct, not appressed; 

 axial sculpture of more or less evident incremental lines, sometimes 

 so strong as to suggest riblets; spiral sculpture of fine threads, almost 

 obsolete on most of the shell but coarser and more evident near the 

 canal, covering the whole surface with narrower interspaces; aperture 

 semilunate, outer lip simple, body erased, pillar very short, canal 

 hardly differentiated; heigth of shell, 13; of last whorl. 8; of aper- 

 ture. 4; diameter, 6 mm. U. S. Nat. Mus. Cat. No. 22100S. 



Type-locality. — Beach at Kiska Harbor, Aleutians, station 1026; 

 W. H. Dall. 



? NITIDELLA LLTULENTA, new species. 



Shell small, pale, with pale variations of brown or none, covered 

 with a fibrous pale brownish periostracum ; with about six whorls, 

 including an extremely minute smooth nucleus; suture distinct, not 

 appressed; surface of the whorls moderately convex; axial sculpture 

 none but faint incremental fines ; spiral sculpture only of a few spiral 

 grooves on the back of the canal; aperture simple, the outer lip thin, 

 not lirate within, body with a slight glaze, pillar thickened with an 

 obvious keel on its anterior edge; canal short, wide; operculum nor- 

 mal; height of shell, 7; of last whorl, 5.5; diameter, 3.5 mm. U. S. 

 Nat. Mus. Cat. No. 211068. 



Type-locality. — U. S. Fish Commission station 3180, in the Gulf 

 of the Farallones, off San Francisco, in 24 fathoms; bottom tem- 

 perature, 50.7° F. 



This may prove to be an Alia. 



AMPHISSA VERSICOLOR, new variety INCISA. 



Shell varicolored, acute, solid, with a thin brownish fibrous perio- 

 stracum, with about eight whorls, including the smooth nucleus of 

 about one v/horl, the rest of the shell strongly sculptured; spiral 

 sculpture of (on the spire about 6, on the last whorl about 16) strong, 

 low, rounded, equal, and equally spaced cords, except one in front 

 of the almost channeled suture, which is sHghtly more prominent 

 than the others, separated by much narrower deep grooves; the 

 spirals not nodulous when they cross the ribs; axial sculpture of 

 (on the penultimate whorl about 14) obhquely protractive rounded 

 ribs with subequal interspaces, somewhat obsolete near the aperture, 



