SOUTH AFRICAN MARINE MOLLUSKS. 103 



The type and another specimen, Cat. No. 249685, U.S.N.M., come 

 from Port Alfred (Coll. No. 957). The type has 13$ postnuclear 

 whorls, and measures: Length, 9.6 mm.; diameter, 3 mm. 



TRIPHORIS OREADA, new species. 



Plate 11, fig. 4. 



Shell elongate-conic, flesh colored. Nuclear whorls decollated, ex- 

 cepting a very small portion of the last turn, which is smooth. Post- 

 nuclear turns marked by three lamellar, spiral keels, which are very 

 feebly tuberculated. Of these keels the first is at the summit and the 

 last about as far above the suture as it is from the median, which is half 

 way between the other two. These spiral lamellae are truncated 

 abruptly anteriorly and posteriorly and are somewhat flattened at the 

 summit and are about as wide as the spaces that separate them. In 

 addition to the spiral lamellae, the whorls are marked by numerous, 

 feeble, slightly retractive axial ribs, which are best developed in the 

 grooves between the spiral lamellae, passing up on the sides of these 

 and rendering them weakly nodulous on the two sides. Of these ribs, 

 about 20 occur upon the first' to third, 22 upon the fourth to sixth, 

 24 upon the seventh, 26 upon the eighth, 28 upon the ninth to eleventh 

 and 30 upon the penultimate turn. The spaces inclosed between the 

 spiral lamellae and the axial riblets are squarish, weakly impressed 

 pits. Periphery of the last whorl marked by a spiral cord a little 

 weaker than the lamellae on the spire and separated from the supra- 

 peripheral cord by a sulcus about as wide as those on the spire, which is 

 crossed by the feeble continuations of the axial riblets. Base provided 

 with another spiral cord which is half way between the peripheral cord 

 and the insertion of the columella. Aperture very strongly twisted 

 and channeled anteriorly, slightly less so posteriorly; outer lip pat- 

 ulous, thin, showing the external sculpture within; columella very 

 much twisted and curved, covered with a thick callus which also ex- 

 tends over the parietal wall and renders the peritreme complete. 



Cat. No. 249682, U.S.N.M., contains the type and another speci- 

 men, both from Port Alfred (Coll. No. 954). The type has 13 whorls, 

 and measures: Length, 8.8 mm.; diameter, 2.1 mm. 



TRIPHORIS, species? 



Cat. No. 187045, U.S.N.M., contains a young, broadly conic, brown 

 species, from Port Alfred, which differs from any of the other material 

 we have seen from South Africa, but is too young to be positvely de- 

 termined (Cat. No. 583). 



TRIPHORIS AFRICANA, new species. 



Plate 5, fig. 11. 



Shell elongate-conic, light chestnut brown, except the nucleus 

 and the early post-nuclear whorls which are wax yellow, with the 



