35 



Pyeamidella sulcata, Ol.S. 



Shell minute, wliite, sliining, ventricose, with short acute 

 spire ; whorls, 6 convex ; body whorl half the length of 

 shell ; with the exception of a rather wide space under 

 impressed suture, the whorls are ornamented with regular 

 equi-distant spiral sulci, 11 on last whorl ; aperture ovate, 

 nearly equalling spire in length ; columella abbreviate, with 2 

 thick oblique plaits ; outer margin thin. Long. 4mil., lat. 

 2mil. Long aper. 2 lat. 1. Eare, Table Cape. 



YOLUTA StEPHENSI, U.S. 



Shell broadly fusiform, turreted ; ^^ullus moderately large, 

 of about If turns ; apical angle, 50 ^ to 60 ^ ; spire conical of 5 

 whorls besides the pullus, each whorl ornamented with 14 to 18 

 angular sigmoid longitudinal ribs (14 on last whorl), extending 

 from a point near the suture (from which they expand into a 

 crown of more or less sharply angled tubercles) to the base, 

 towards which the ribs tend to become obsolete ; the 

 tubercles on the last whorl expand almost at right angles to 

 axis, and as they approach pullus they become less and less 

 distinct ; immediately under suture a second row of broad, 

 almost obsolete, tubercles, surmount the larger row above the 

 interspaces ; the space between the rows varies, being 

 slightly concave on the upper whorl, and almost deeply 

 angular on the last ; tubercular expansion on last whorl 

 about 16mil. ; nodes and interspaces finely striate with lines 

 of growth ; spiral lines indistinct or absent ; mouth, with a 

 slight posterior channel, oblong, narrowed in front ; inner lip 

 slightly curved, with 4 slender rather angular equidistant 

 oblique plaits ; spaces betvreen plaits concave ; outer lip thin, 

 simple, not expanded into a wing. Length llOmil., breadth 

 of body whorl 55mil., relative length of body whorl -j^^g 

 relative length of penultimate whorl y^^. This is a very 

 distinct shell, and differs from V. IIan7iafordi, McCoy, to 

 which it bears some resemblance, in the smaller pullus, the 

 more angulate appearance, and the absence of spiral striae 

 and expanded wing. Eare, only 1 perfect specimen found 

 at Table Cape. 



YoLUTA AlLPORTI, 71.S. 



Shell large, ovately fusiform, of six regularly increasing 

 whorls, besides a small pullus which is too imperfect in the 

 various specimens for description ; spire acute ; apical angle 

 45 deg., slightly concave in outline ; whorls slightly convex, 

 and only ornamented with fine longitudinal lines of growth ; 

 aperture rather narrow, elliptical ; lip not expanded into a 

 wing, simple ; columella curved, with 4 distinct slender 

 oblique plaits ; length, when perfect, about 8 inches, or 



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