102 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



No. 950). The type has lost the early nuclear whorls, the last one 

 only remaining. In addition to that it has a little more than 10 

 post-nuclear whorls, and measures: Length, 9.5 mm.; diameter, 

 3.1 mm. 



TR1PHORIS SHEPSTONENSIS Smith. 



Cat. No. 186804, U.S.N.M., four specimens from Port Alfred 

 (Coll. No. 170). Cat. No. 227716, U.S.N.M., six specimens from 

 the same locality (Coll. No. 811). Cat. No. 250351, U.S.N.M., another 

 specimen from Port Alfred (Coll. No. 1224). 



TRIPHORlS MILDA, new species. 

 Plate 11, fig-. 3. 



Shell elongate-conic, light brown. Nuclear whorls decollated. 

 Post-nuclear whorls tabulatedly shouldered at the summit, flattened, 

 marked by three strong, tuberculated spiral cords, of which the first 

 is at the summit, the second halfway between this and the last, the 

 latter being about as far above the suture as it is distant from the 

 median. In addition to the spiral cords the whorls are marked by 

 rather strong, broad, almost vertical axial ribs, of which 14 occur 

 upon the first and second, 16 upon the third, 20 upon the fourth and 

 fifth, 22 upon the sixth to ninth, 26 upon the tenth, 24 upon the 

 eleventh, 26 upon the twelfth, and 28 upon the thirteenth and the 

 penultimate turn. The junctions of the axial ribs and the spiral 

 cords form strong tubercles, of which those on the first cord are 

 truncated anteriorly, forming a decidedly channeled, crenulated 

 suture. These tubercles are of oval outline, having then long axis 

 parallel with the ribs. The tubercles of the median cord are almost 

 rounded, truncated posteriorly, and slope gently anteriorly. Those 

 of the supra-sutural cord are smaller than the rest and a little more 

 strongly truncated posteriorly, sloping abruptly anteriorly. The 

 spaces inclosed between the axial ribs and peripheral cords are well 

 rounded, strongly impressed pits. Sutures strongly channeled, show- 

 ing a portion of the first basal cord. Periphery of the last whorl 

 marked by a sulcus, which is crossed by the continuations of the axial 

 ribs and is about as wide as the sulcus on the spire. Base well rounded, 

 marked by three strong spiral cords, which divide the posterior 

 half of the base, that is, the space between the peripheral sulcus 

 and the insertion of the columella, into equal portions. These 

 three cords become diminished in strength in regular sequence from 

 the one adjacent to the periphery to the one on the columella. The 

 entire surface of the shell is marked by exceedingly fine lines of 

 growth and microscopic spiral striations. Aperture strongly chan- 

 neled anteriorly, less so posteriorly; junction of the basal and outer 

 lip forming a decided angle that projects as a claw-like element; 

 outer lip thin, showing the external sculpture within; columella short, 

 stout, curved, marked by a thick callus which extends over the 

 parietal wall and renders the peritreme complete. 



