SOUTH AFRICAN MARINE MOLLUSKS. 151 



tuberculated. In addition to the above sculpture, the entire surface 

 of the post-nuclear whorls is marked by very many, narrow, lamellar, 

 axial threads, which pass over the grooves between the spiral cords 

 and also the tubercles of the ridges. Sutures moderately impressed. 

 Periphery rendered feebly angulated by a spiral cord. Base short, 

 deeply and broadly umbilicated, marked with eight equal and equally 

 spaced, strong, nodulous spiral cords and an equal number of weak 

 nodulous spiral threads which occur half-way between the strong 

 cords. One of these slender threads also occurs between the strong 

 peripheral cord and the first basal. In addition to the above, the 

 entire surface is marked by the continuations of the slender lamellar 

 riblets. No ribs are apparent within the umbilicus. Aperture 

 rhomboidal; outer lip rendered sinuous by the external sculpture, 

 which is also true of the basal Up; inner lip oblique, straight; parietal 

 wall not covered with a callus. 



The type, Cat. No. 186871a, U.S.N.M., comes from Port Alfred 

 (Coll. No. 241a). The type has a little more than two and one-half 

 post-nuclear whorls, and measures: Altitude, 7.2 mm.; greater diam- 

 eter, 8.7 mm. 



CLANCULUS WALTONAE Sowerby. 



Cat. No. 187105, U.S.N.M., one specimen from Port Alfred (Coll. 

 No. 650). Cat. No. 227779, U.S.N.M., one specimen from the same 

 locality (Coll. No. 874). 



CLANCULUS MERULOIDES Krauss. 



Cat. No. 18680, U.S.N.M., one specimen from Cape of Good Hope. 



Genus OXYSTELE Philippi. 

 OXYSTELE MERULA Lamarck. 



Cat. No. 104, U.S.N.M., three specimens collected by William 

 Stimpson on the North Pacific Exploring Expedition at the Cape 

 of Good Hope. Cat. No. 36801, U.S.N.M., one specimen from the 

 Cape of Good Hope. Cat. No. 90152, U.S.N.M., two specimens 

 from the same locality. Cat. No. 98008, U.S.N.M., three specimens 

 from the Peddie coast, South Africa. Cat. No. 186881, U.S.N.M., 

 three specimens from Port Alfred (Coll. No. 251). 



OXYSTELE TIGRINA Anton. 



Cat. No. 98, U.S.N.M., two specimens collected by William Stimp- 

 son on the North Pacific Exploring Expedition at the Cape of Good 

 Hope. Cat. No. 104a, U.S.N.M., six specimens collected by the 

 same party at the same place. Cat. No. 98022, U.S.N.M., seven 

 specimens from Peddie and Albany, South Africa. Cat. No. 186880, 

 U.S.N.M., three specimens from Port Alfred (Coll. No. 250). 



Cat. No. 250491, U.S.N.M., three young specimens from the 

 same locality (Coll. No. 1364). 



