SOUTH AFRICAN MARINE MOLLUSKS. 107 



second at some little distance posterior to the suture. Beginning 

 with the thud whorl, a slender, spiral thread makes its appearance 

 half way between the two strong cords ; this increases steadily in size 

 and on the last turn it bears nodules almost as strong as those of the 

 other two cords. In addition to the spiral sculpture, the whorls are 

 marked by slender, vertical, axial ribs, the junction of which with 

 the spiral cords render them tuberculated. Of these ribs, 20 occur 

 upon all but the last, which turn has 22. The spaces inclosed 

 between the axial ribs and the spiral cords form well impressed pits. 

 The tubercles of the cord. at the summit are strongly rounded; those 

 of the median cord are merely thickened lines at the junction on the 

 first two whorls where they occur, while on the last, they are oval, 

 their long axis coinciding with the spiral cord. Those of the third 

 cord are truncated posteriorly, sloping gently anteriorly. Sutures a 

 little broader than the sulci between the spiral cords. Periphery of 

 the last whorl marked by a spiral sulcus which is about as broad as 

 the one separating the supraperipheral from the median cord on the 

 last whorl. Base well rounded, marked by two spiral cords, the first 

 of which is immediately below the periphery, the second half way 

 between this and the insertion of the columella. In addition to the 

 above mentioned sculpture, the entire surface of the shell is marked 

 by fine lines of growth and microscopic, spiral striations. Aperture 

 strongly channeled anteriorly, feebly so posteriorly, decidedly 

 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 this sculpture; columella short, very stout, covered on its 

 inner edge by a strong callus which is reflected over the parietal 

 wall and renders the peritreme complete. 



Cat. No. 249680, U.S.N.M., contains three specimens from Port 

 Alfred (Coll. No. 952). One of these, the type, has six postnuclear 

 whorls, and measures: Length, 3 mm.; diameter, 1.4 mm. 



TRIPHORIS, species? 



Cat. No. 250353, U.S.N.M., contains the tip of a dusky cylindric 

 species, which we are unable to identify, from Port Alfred (Coll. 

 No. 1226). 



TRIPHORIS FUSCESCENS Smith. 



The United States National Museum contains four lots of this 

 species from Port Alfred, as follows: Cat. No. 186808, two specimens 

 (Coll. No. 174). Cat. No. 220061, one specimen (Coll. No. 173a). 

 Cat. No. 227721, two specimens (Coll. No. 816). Cat. No. 249674, 

 two specimens (Coll. No. 946). 



TRIPHORIS CEREA Smith. 



Cat. No. 249681, U.S.N.M., contains three specimens from Port 

 Alfred (Coll. No. 953). 



