122 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



terior angle decidedly obtuse; outer lip thin, showing the external 

 sculpture within, which renders the outer lip sinuous at the edge; 

 columella oblique, very thin, and slightly revolute. 



The type, Cat. No. 250396, U.S.N.M., comes from Port Alfred (Coll. 

 No. 1269). It has seven postnuclear whorls, and measures: Length, 

 2 mm. ; diameter, 0.7 mm. 



Genus DIALA A. Adams. 



DIALA INFRASULCATA Sowerby. 



Three specimens, Cat. No. 187070, U.S.N.M., from Port Alfred 

 (Coll. No. 608). Cat. No. 187071, three specimens from Port Alfred 

 (Coll. No. 609). 



DIALA AFRICANA, new species. 

 Plate 6, fig. 1. 



Shell elongate-conic, subdiaphanous. Nuclear whorls scarcely 

 differentiated from the postnuclear turns. Postnuclear whorls 

 strongly rounded, marked by numerous lines of growth and exceed- 

 ingly fine spiral striations; the summits of the whorls are appressed 

 to the preceding turns and allow these to shine through them, which 

 gives the shell the aspect of having a double suture; sutures strongly 

 constricted. Periphery of the last whorl somewhat inflated, well 

 rounded. Base broadly umbilicated, well rounded, marked like the 

 spire. Aperture large; outer Up thin, translucent; inner lip free, 

 strongly curved, and somewhat reflected over the umbilicus; parietal 

 wall glazed by a thin callus. 



The type, Cat. No. 187063, U.S.N.M., comes from Port Alfred 

 (Coll. No. 601). It has seven and one-half whorls, and measures: 

 Length, 4.8 mm.; diameter, 2.1 mm. 



The following specimens from Port Alfred are in the collection of 

 the United States National Museum: Cat. No. 187067, one specimen 

 (Coll. No. 605). Cat. No. 227746, three specimens (Coll. No. 841). 

 Cat, No. 249722, two specimens (Coll. No. 994). Cat. No. 250424, 

 three specimens (Coll. No. 1297). Cat. No. 250434, two specimens 

 (Coll. No. 1307). In addition to these I have seen two lots, also from 

 Port Alfred: (Coll. No. 1599), two specimens and (Coll. No. 1593), 30 

 specimens, which were returned to Colonel Turton. 



DIALA DUBIA Sowerby. 



The United States National Museum has seven lots of this species 

 from Port Alfred. Cat. No. 186812, 5 specimens (Coll. No. 178). 

 Cat. No. 187060, 2 specimens (Coll. No. 598). Cat. No. 187464, 

 1 specimen (Coll. No. 602). Cat. No. 187065, 2 specimens (Coll. 

 No. 603). Cat. No. 227744, 3 specimens (Coll. No. 839). Cat. No. 

 249725, 2 specimens (Coll. No. 997). Cat. No. 250430, 2 specimens 

 (CoU. No. 1303). Cat. No. 250433, 2 specimens (Coll. No. 1300). 

 Cat. No. 252202, 15 specimens (Coll. Nos. 1591 and 1597). (In addi- 



