66 BULLETIN OF THE 



over them, as well as the primaries, the lines of growth are raised in micro- 

 scopic granules, or lamellae, which, under strong magnification, give a very 

 peculiar scabrous appearance to the surface ; the strongest primary riblet is the 

 one just in advance of the somewhat steeply declining and poorly defined notch- 

 band ; aperture narrow, notch deep, outer lip thin, produced, probably thick- 

 ened in the perfectly mature adult ; columella and body whorl without callus ; 

 pillar straight ; suture appressed ; canal slightly recurved. Lon. of shell, 9.0 ; 

 of last whorl, 5.25 ; of aperture, 4.12. Max. lat. 3.25 mm. Den. about 28°. 



Bed of the Gulf Stream, Pourtales, 447 fms. 



This much resembles, on a cursory glance, the two preceding species, while a 

 careful microscopic scrutiny shows very marked differences. 



P. (Drillia) smirna n. b. 



Shell long, slender, shining with the lustre of barley-sugar candy ; whorls 

 twelve, of which two are nuclear ; nucleus white, smooth, rather large, inflated, 

 polished, not sculptured except by lines of growth, changing suddenly into the 

 normal sculpture ; sculpture consisting of small pointed nodules set on the pe- ' 

 riphery of the whorls, a little in advance of midway between the sutures, ten 

 to fourteen on each whorl, except the last half-whorl in the adult, where they 

 begin to be obsolete ; the tips of these nodules and a line just in advance of 

 the suture are white as compared with the general translucent pinkish or fleshy 

 hue ; these nodules are a little compressed in the latter whorls in a direction 

 transverse to the whorls ; the lines of growth are distinct and in the later 

 whorls occasionally a little prominent at the suture, against which the shell is 

 appressed ; other transverse, sculpture none ; revolving sculpture comprised in 

 fifteen or twenty threads on the last whorl, faintly visible at the periphery and 

 gradually becoming stronger toward the end of the canal ; an occasional trace 

 of such might be visible on some of the older whorls ; notch moderately deep ; 

 notch-band not strongly marked ; outer lip in the adult produced (but imper- 

 fect in our specimens), apparently having the usual form ; pillar obliquely cut 

 off anteriorly, covered with a light callus ; canal narrow ; aperture short and 

 seemingly rather wide, behind. Lon. of shell, 15.0 ; of last whorl, 5.75 ; 

 of aperture, 4.0. Max. lat. of shell, 3.25 ; of aperture, about 1.5 mm. Defl. 

 about 16°. 



Off Cape San Antonio, 413 fms. 



An elegant, remarkable, and characteristic species. 



P. (Drillia) oleacina n. s. 



Shell in sculpture much resembling the last) especially on the older whorls 

 which differ from those of D. smirwi in the following particulars : the nucleus 

 is a rich, dark, shining brown ; tin- nodules have more extended bases, and want 

 the white tips; the color of tin' whorls i* more clearly translucent, wanting 

 the pinkish tinge and the white sutural line ; the whorls increase more rapidly 



