106 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



poorly separated, low, rounded, slightly protractive, axial ribs, of 

 which 16 occur upon the first and second, 18 upon the third, 20 upon 

 the fourth to sixth, and 24 upon the penultimate whorl. The 

 junction of these ribs and the spiral cords form poorly defined tuber- 

 cles. Those on the first cord being very illdefined and oval, while 

 those on the median cord are oval and truncated anteriorly and 

 posteriorly, having the long axis parallel with the spiral sculpture, 

 appearing like a series of strung beads. Those of the anterior cord 

 are truncated posteriorly and are well rounded anteriorly. Sutures 

 channeled, a little more strongly so than the space between the spiral 

 cords of the spire. Periphery of the last whorl marked by a spiral 

 sidcus about as wide as the sulci on the spire and like those crossed 

 by the continuation of the axial ribs which terminate at the posterior 

 edge of the first basal cord. Base moderately rounded, marked by 

 four spiral cords which grow successively weaker from the first, im- 

 mediately below the periphery, to the last, which is on the base of 

 the columella. In addition to this sculpture, the entire surface is 

 marked by exceedingly fine lines of growth and microscopic, spiral 

 striations. Aperture rather large, decidedly channeled anteriorly, less 

 so posteriorly, patulous at the junction of the outer and basal lip; 

 outer lip thin, showing the external sculpture within and rendered 

 sinuous at the edge by the external sculpture; columella covered by 

 a thick callus, which is reflected over the parietal wall and renders 

 the peritreme complete. 



The type, and another specimen, Cat. No. 249677, U.S.N.M., come 

 from Port Alfred (Coll. No. 949a). The type is a perfect specimen 

 having the four nuclear turns and eight postnuclear whorls, and 

 measures: Length, 6.5 mm.; diameter, 2 mm. 



TRIPHORIS, species? 



Cat. No. 249677, U.S.N.M., contains a pure white specimen, re- 

 calling strongly in sculpture TripJioris milda, but it is of a much 

 smaller species with four basal keels; it is not quite adult and we 

 refrain from describing it for the present till better material may 

 be had. It comes from Port Alfred (Coll. No. 949a). 



TRIPHORIS SABITA, new species? 

 Plate 11, fig. 7. 



Shell small, elongate-conic, ovate, light brown, excepting the 

 tips of the tubercles which are flesh colored. The extreme tip 

 of the shell is wax-yellow and the outer lip is white. Nuclear whorls 

 a little more than two, the first smooth, the second finely trans- 

 versely ribbed, the riblets having slender nodules, the first of which 

 is near the summit, the other immediately above the suture. Post- 

 nuclear whorls moderately rounded, the first two ornamented by two 

 nodulose, spiral cords, the first of which is at the summit and the 



