56 BULLETIN OF THE 



the shell. Lon. 11.0. Lat. 4.0 mm. Aperture equal to the spire above the 

 last whorL 



Station 2, 805 fnis. Yucatan Strait, 640 fms. Gulf Stream, 447 fms., Pour- 

 tales. 



P. (Bela) filifera n. s. 



Shell thin, delicate, elongated, fusiform, waxy white ; nuclear whorls three, 

 generally decorticated, but when perfect probably as in the preceding species ; 

 whorls in all ten, near the suture smooth except for the distinct lines of growth 

 indicating the deep wide notch ; suture appressed, indistinct ; elsewhere sculp- 

 tured with numerous nearly uniform flattened revolving threads with about 

 equal interspaces ; otherwise with obliquely transverse elevations, hardly lim- 

 ited sharply enough to call ribs ; these appear just below the sutural smooth 

 band (sixteen on last whorl), cross the whorls of the spire with a slight angu- 

 lation above the middle of those whorls, but on the last whorl disappear 

 at about the periphery ; tolerably evident lines of growth appear here and 

 there, crossing the spiral sculpture ; spire less than one third of the shell ; aper- 

 ture a little less than half the length of the shell; pillar straight, simple, pol- 

 ished. Lon. 17.5. Lat. 6.25 mm. 



Station 47, 331 fms. 



A remarkably elegant species, which resembles none of the Northern forms. 



P. (Genota) mitrella n. s. 



Shell white, strong, acutely fusiform, nine-whorled ; nucleus and two nu- 

 clear whorls rounded, smooth, shining, white ; spiral sculpture consisting of 

 two small threads next before the suture separated, by a smoother excavated 

 space representing the notch, from two or three or even four strong flattened 

 threads (the second of which forms the periphery) which distinctly overlie the 

 transverse sculpture, are continued on the last whorl to the canal, and number 

 about twenty-two ; beside these the entire surface is overscored with very mi- 

 nute microscopic spiral stria? ; the transverse sculpture is of twelve to fourteen 

 sharp straight ridges, continuous from the earlier whorls to the last one, except 

 on the final half of the latter and on its anterior two thirds where they become 

 obsolete; suture appressed, indistinct; column straight, simple; outer lip 

 slightly excavated (for the notch) just in advance of the suture, then broadly 

 projecting with its edge somewhat thickened, then falling away toward the 

 canal with a thinner edge ; aperture Long, narrow, somewhat less than half as 

 long as the >hell, internally smooth. Lon. L2.5. Lon. of last whorl, 7.26. 

 Lat. l.-2"t. Lat. of aperture, 1.4 mm. 



Fucatan strait, <i m fms. 



This little species has much the aspect of a small acute rough-sculptured 

 Mitra. 



