SOUTH AFRICAN MARINE MOLLUSKS. 175 



Hope. Cat. No. 16671, U.S.N.M., two specimens from tne Cape of 

 Good Hope. Cat. No. 42848, U.S.N.M., one specimen from the Cape 

 of Good Hope. Cat. No. 89089, U.S.N.M., one specimen from the 

 Cape of Good Hope. Cat. No. 98004, U.S.N.M., two specimens from 

 Albany. Cat. No. 186885, U.S.N.M., one specimen from Port Alfred 

 (Coll. No. 255). Cat. No. 227786, U.S.N.M., three specimens from 

 the same locality (Coll. No. 8S1). 



HALIOTIS PERTUSA Reeve. 



Cat. No. 33, U.S.N.M., three specimens collected by William Stimp- 

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

 Hope. 



HALIOTIS PARVA Linnaeus. 



Cat. No. 187116, U.S.N.M., two specimens from Port Alfred (Coll. 

 No. 662). Cat. No. 187117, U.S.N.M., one specimen from the same 

 place (Coll. No. 663). Cat. No. 176, U.S.N.M., one specimen collected 

 by William Stimpson on the North Pacific Exploring Expedition at 

 False Bay. Cat. No. 16970, U.S.N.M., one specimen from Cape of 

 Good Hope. Collected by Carpenter. 



HALIOTIS ALFREDENSIS, new species. 

 Plate 24, figs. 7, 8. 



Shell elongate-ovate, irregularly mottled with chestnut brown and 

 very pale olive buff flecks and dottings. The space between the base 

 and the perforations is brown, with narrow radiating bands of pale 

 olive buff which are about one-fourth as wide as the brown bands. 

 The sculpture consists of fine, radiating, decidedly retractively slant- 

 ing threads on the early whorls, which become somewhat coarser, 

 wider, and less sharply defined on the last half turn., and numer- 

 ous fine spiral lirations which become more or less wavy anteriorly. 

 The space between, the perforations and the base is slightly concave 

 on the posterior half and well rounded on the anterior half, and 

 marked by the continuation of the lines of growth and wavy spiral 

 striations. The nacre of the interior has a rosy flush, and a weak red 

 wash within the spire. The spiral sculpture is apparent on the in- 

 side. This shell has the shape of Haliotis midae, but lacks the rugose 

 sculpture of the exterior, the sculpture resembling more that of 

 Haliotis pertusa, but differing from this in being much finer and more 

 regular. 



The type, Cat. No. 250517, U.S.N.M., comes from Port Alfred (Coll. 

 No. 1390). It measures : Altitude, 12 mm. ; length, 55 mm. ; diameter, 

 39.5 mm. 



Family SCTSSURELLIDAE. 



Genus SCISSURELLA Orbigny. 



SCISSURELLA JUCUNDA Smith. 



Three lots of this species are in the collection of the United States 

 National Museum, all from Port Alfred. They are: Cat. No. 187097, 



