310 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Columbella (Astyris) ep. indet. 



A dead and mutilated specinieu of an unusually large Astyris, recalling Astyris 

 saintpairiana Caillet, of the Lesser Antilles, but more solid and with a ■wider 

 apical angle. The outer lip is broken off, leaving only a trace of its presence near 

 the subsutural callus. There were about six whorls, smooth, except that the 

 apical ones show faint traces of fine low ribbing. ' The pillar is short and straight, 

 not markedly recurved as in Strombina. The somewhat defective shell is 23 mm. 

 long, the last whorl 16, and the aperture 11, while the maximum diameter is (at 

 the suture of the last whorl) 9.5 mm. 



U. S. S. " Albatross," station 3370, near Cocos Island, in 134 fathoms, mud, 

 bottom temperature 54°.8 F. U. S. N. Mus. 106,889. 



This species, when intact, must very nearly be the largest species known of 

 Astyris. 



STR0:TIBI]^A Morch. 

 Strombina edentula Da.ll, n. ep. 



Shell large, smooth, ten-whorled, whitish with obscure brown cloudings and 

 an ill-defined peripheral pale band, all covered by a smooth, pale yellowish perios- 

 tracum ; spire acute, a little shorter than the aperture ; suture distinct, not 

 appressed; nucleus small and smooth, of about two whorls; succeeding four 

 apical whorls axially ribbed with fourteen or fifteen small, rounded, smooth, 

 nearly vertical ribs, crossing the whorls, with subequal interspaces ; these ribs 

 become obsolete on the next, and are wholly absent from the later whorls which 

 for axial sculpture have only incremental lines, and a single, stout, rounded, not 

 distorted varix behind the outer lip; spiral sculpture only on the base and canal, 

 at first faint, but growing strong anteriorly to the end of the canal ; whorls mod- 

 erately rounded, on the spire rather flattish; aperture elongate, narrow; outer 

 lip thickened but not reflected; internally, perfectly smooth and white, without 

 liration or denticulatiou of any sort ; inner lip with a moderate layer of callus, 

 continuous with that of the outer lip ; subsutural ridge on the body rather distant 

 from the posterior commissure of the aperture; pillar long, callous, tliickened but 

 not plaited at the anterior edge; canal short, wide, strongly recurved; operculum 

 narrow, ovate, with apical nucleus. Lon. of shell, 34 ; of last whorl, 24 ; of aper- 

 ture, 19 ; max. diam. 13.5 mm. 



U. S. S. " Albatross," station 2830, northwest from Cape St. Lucas, on the 

 outer shore of the Peninsula of Lower California, in 66 fathoms, sand, bottom 

 temperature 74°.l F. U. S. N. Mus. 96.578. 



This is one of the largest species and different from most of the others in having 

 no hump or distortion of the last whorl, and no teeth inside the inner lip or on 

 the pillar. It differs from S. turrita Sowerby, its nearest relative, by its shorter 

 and apically ribbed spire, its wider, last whorl, and less emphatic channelling of 

 the aperture behind. Also, probably, in the slight tabulation of the whorl for a 

 narrow space just in front of the suture. 



