SOUTH AFRICAN MARINE MOLLUSKS. 61 



thread appears midway between the spiral cords. Periphery of the 

 last whorl well-rounded. Base somewhat produced, marked by seven 

 cords equaling those on the anterior portion of the spire in strength. 

 The four grooves between the cords anterior to the periphery have 

 each a slender spiral thread. Aperture irregularly oval, channeled 

 anteriorly and posteriorly; outer lip thin at the edge, where it is ren- 

 dered somewhat sinuous by the external sculpture, thick within and 

 armed by a callus, bearing seven denticles, columella stout, slightly 

 curved, and partly reflected over the body whorl. 



The type has six whorls and measures: Length, 18.5 mm.; diam- 

 eter, 10.1 mm. The type and another specimen, Cat. No. 272130, 

 U.S.N.M., were received from Mr. John B. Henderson in a collection 

 recently donated to the United States National Museum, which was 

 purchased from Sowerby and Fulton, and was labelled " Pentadacty- 

 luslividus Reeve, South Africa." It is not Reeve's species, which 

 comes from the Philippines and which we have in the collection of the 

 National Museum from the type locality. True lividus is a much stouter 

 species with different detailed sculpture. The specimens reached me 

 as this paper was passing through press. I was therefore unable to 

 add a figure of it. 



Genus THAIS Bolteri. 

 THAIS CAPENSIS Petit. 



Cat. No. 186778, U.S.N.M., one from Port Alfred (Coll. No. 139). 



THAIS TEXTURATA Smith. 



Cat. No. 186779, U.S.N.M., two from Port Alfred (Coll. No. 140). 



THAIS CASTANEA Kuster. 



Cat. No. 186782, U.S.N.M., two from Port Alfred (Coll. No. 143). 



THAIS CATARACTA Chemnitz. 



Cat. No. 186781, U.S.N.M., three from Port Alfred (Coll. No. 142). 



THAIS SQUAMOSA Lamarck. 



Cat. No. 186780, U.S.N.M., one from Port Alfred (Coll. No. 141). 

 Genu^ LATIAXIS Swainson. 



LATIAXIS ROSACEUS Smith. 



Cat. No. 186783, U.S.N.M., two from Port Alfred (Coll. 144). 



Family CORALLIOPHILIDAE. 



Genus CORALLIOPHILA H. and A. Adams. 



CORALLIOPHILA RUBROCOCCINEA Melvill and Standen. 



Cat. No. 186784, U.S.N.M., one specimen from Port Alfred (Coll. 

 No. 145). 



Cat. No. 187028, U.S.N.M., one from the same place (Coll. No. 564). 



