60 BULLETIN OF THE 



ular and extend partially over the notch-band, which is thus rendered much 

 less conspicuous than in the last species; the notch is also less marked and 

 the spire has a stouter aspect. Lon. of shell, 5.75 ; of last whorl, 4.25 ; of 

 aperture, 3.0. Lat. of last whorl, 2.5 mm. Defl. about 41°. 

 Cape San Antonio, 640 fins. 



P. (Mangilia) Pourtalesii n. s. 



Shell slender, dull, light brown, eight-whorled ; nucleus large, bubble- 

 shaped, smooth, forming a blunt apex ; other whorls furnished with numerous 

 (on the whorl next to the last 20, and on the last 27) narrow, little-raised, 

 rounded riblets with somewhat wider interspaces, becoming less distinct and 

 more crowded in the adult near the aperture ; the posterior terminations of 

 these riblets are waved, forming an obscure notch-band, each being slightly 

 enlarged close by the suture and also on the anterior side of the band, thus 

 forming two rows of indistinct nodulations, of which the sutural row is more 

 clearly defined than the other ; the riblets extend from suture to suture, and 

 near its anterior third become obsolete on the last whorl ; here eight or ten 

 rather indistinct revolving threads exist, becoming more distinct toward the 

 end of the canal, separated from each other by shallow grooves ; these pass 

 round the column into the aperture ; canal short, wide ; aperture simple, with 

 thin margins ; notch rather indistinct in the adult. Lon. of shell, 17.0 ; of 

 last whorl, 9.5 ; of aperture, 7.0. Lat. of last whorl, 6.0 ; of aperture, 2.0 mm. 

 Defl. about 25°. 



Bed of the Gulf Stream, Pourtales, in 447 fins. 



An inconspicuous but well-marked species. 



P. (Mangilia) columbella n. s. 



Shell whitish, inclining to dove-color, sbghtly translucent, thin, delicate, 

 with eight and a half sub-turreted whorls ; nucleus minute, Bhining, glassy, 

 transparent ; succeeding whorls regularly sculptured by transverse slightly 

 oblique riblets, about twenty on the last whorl but one, extending from suture 

 to suture on the spire, somewhat shouldered before the suture giving the spire 

 a sub-turreted appearance, becoming less numerous, regular and prominent on 

 tin- last whorl, ami vanishing at or before reaching its periphery ; revolving 

 sculpture uf close microscopic stria often elegantly waved, covering the whole 

 surface except the apical whorls ; column short, straight, simple, with a groove 

 behind it, forming a distincl siphonal fasciole ; notch very shallow and incon- 

 spicuous; outer margin thin, simple; canal very short and wide; aperture 

 almost lunate. Lon. of shell, LO.O ; of last whorl. <;.."> ; of aperture. 4.5. Lat. 

 of -hell, 4.5 ; of aperture, 1.8 mm, Defl. abort 



Station 20, 220 fins. 



This is oi f the s\ ies which, in the absence of the soft parts, is difficult 



to locate. It is possible it should be referred to /•' la. It i- not unlike one ..r 

 two Antic species. 



