174 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



half by incised lines which correspond in every way with those on the 

 spire. The anterior half is free of spiral sculpture. Aperture 

 oblique, subcircular; posterior angle obtuse; outer lip rather thick, 

 strongly curved; inner lip strongly curved and slightly reflected. 

 A thick callus fills the posterior angle of the aperture. 



The type, Cat. No. 250553, U.S.N.M., comes from Port Alfred 

 (Coll. No. 1426). It has one and one-fourth postnuclear whorls, and 

 measures: Altitude, 0.6 mm.; greater diameter, 1 mm. 



Family NERITIDAE. 



Genus NERITA Lamarck. 



NERITA ALBICILLA Linnaeus. 



Cat. No. 21820, U.S.N.M., one specimen from Algoa Bay. Cat. No. 

 97991, U.S.N.M., four specimens from Kaffraria, South Africa. Cat. 

 No. 187086, U.S.N.M.,four specimens from Port Alfred (Coll. No. 629). 

 Cat. No. 250486, an additional specimen from the same locality (Coll. 

 No. 1359). Cat. No. 272143, U.S.N.M., two from South Africa. 

 Genus NERITINA Lamarck. 



NERITINA, species ? 



Cat. No. 187088, U.S.N. M., contains a specimen from Port Alfred 

 (Coll. No. 631), which is different from any of the Neritinas hereto- 

 fore reported from South Africa, or known to us, but is too poor to 

 serve for a description. Cat. No. 250487, U.S.N.M., must be referred 

 here for the same reason (Coll. No. 1360). 



NEPIONIC SHELLS. 

 Plate 30, figs. 6, 7. 

 Cat. No. 187087, U.S.N. M., contains two nepionic shells of neri- 

 tinid shape, from Port Alfred (Coll. No. 630). They are very finely, 

 spirally lirate. I do not know where they belong, but place them 

 here simply on account of their shape. Cat, No. 249760, U.S.N.M., 

 contains two additional specimens of the same species (Coll. No. 1032). 



Family HALIOTIDAE. 



Genus HALIOTIS Linnaeus. 



HALIOTIS MIDAE Linnaeus. 



Cat. No. 43068, U.S.N.M., one specimen from the Cape of Good 

 Hope. Cat. No. 89103, U.S.N.M., three specimens from the Cape of 

 Good Hope. Cat. No. 98002, U.S.N.M., six specimens from Albany, 

 South Africa. Cat. No. 9S003, U.S.N.M., eight specimens from 

 Albany. Cat. No. 1S6886, U.S.N.M., three specimens from Port 

 Alfred (Coll. No. 256). Cat. No. 187118, U.S.N.M., one specimen 

 from the same place (Coll. No. 664). Cat. No. 249895, U.S.N.M., 

 another specimen from the same locality (Coll. No. 1167). 



HALIOTIS SANGUINEA Hanley. 



Cat. No. 85, U.S.N.M., seven specimens collected by William Stimp- 

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



