SOUTH AFRICAN MARINE MOLLUSKS. 59 



Family MURICIDAE. 



Genus MUREX Linnaeus. 



MUREX UNCINARIUS Lamarck. 



Cat. No. 1 6861 , U.S.N.M., one from Cape of Good Hope. Cat. No. 

 91701, U.S.N.M., three collected by Layard at the same place. Cat. 

 No. 98005, U.S.N.M., three from Albany. Cat. No. 186772, U.S.N .M., 

 one from Port Alfred (Coll. No. 133), and Cat. No. 252155, U.S.N.M., 

 one from Africa without specific locality. Cat. No. 272150, U.S.N .M., 

 one specimen from Algoa Bay. Cat. No. 272151, U.S.N.M., three 

 from the Cape of Good Hope. 



MUREX ALFREDENSIS, new species. 

 Plate 37, fig. 6. 



Shell small, yellowish white, with a zone of wax yellow, which 

 extends over the central half of each whorl, leaving the posterior half 

 between the sutures and the basal tip white. (Nuclear whorls decol- 

 lated); postnuclear whorls well rounded, ornamented with strong 

 lamellar ribs of which ten occur upon all the whorls. These lamellae 

 are slender, recurved, and project at their tips considerably above 

 the strong shoulder of the whorls. The intercostal spaces are scarcely 

 at all depressed, they are about three times as wide as the ribs and are 

 marked by slender and equally spaced spiral threads, of which seven 

 occur upon the first, eight upon the second, and ten upon the penulti- 

 mate whorl between the sutures. In addition to the above-mentioned 

 sculpture, the spire is marked by numerous, very fine axial lines of 

 growth; summits tabulatedly shouldered; the shoulder crossed by the 

 ribs. Periphery of the last whorl gently rounded. Base quite pro- 

 longed, marked by the continuations of the axial ribs which extend 

 quite prominently to the extreme anterior portion of the base, and 

 about fifteen equal and equally spaced, spiral threads, which are 

 equal to those of the spire in strength and spacing. Aperture 

 strongly channeled anteriorly; outer lip reenforced by a very thick 

 varix which is expanded and flattened and is marked by the spiral 

 sculpture; inner Up strongly curved, reflected over and appressed 

 to the base, parietal wall covered by a thick callus. 



The type, Cat. No. 227763, comes from Port Alfred. It has four 

 postnuclear whorls, and measures: Length, 6 mm.; diameter, 3 mm. 

 (Coll. No. 858). 



Genus TROPHON Montfort. 



TROPHON KOWIENSIS Sowerby. 



Cat. No. 187032, U.S.N .M., one from Port Alfred (Coll. No. 568). 

 Cat. No. 227766, U.S.N.M., two specimens from the same locality 

 (Coll. No. 861). 



