130 BULLETIN 91, UNITED STATES NATIONAL MUSEUM. 



The type, Cat. No. 187669, U.S.N.M., comes from Port Alfred 

 (Coll. No. 607). It has almost four postnuclear whorls and measures: 

 Length, 2.3 mm. ; diameter, 1.5 mm. Cat. No. 249704 U.S.N.M., con- 

 tains another specimen from Port Alfred (Coll. No. 976). 



Genus RISSOINA Orbigny. 



RISSOINA ALFREDI Smith. 



Cat. No. 186816, U.S.N.M., two specimens from Port Alfred (Coll. 

 No. 182). 



RISSOINA CALIA, new species. 

 Plate 5, fig. 1. 



Shell elongate-conic, bluish white. Nuclear whorls decollated. 

 Postnuclear whorls moderately rounded, strongly appressed at the 

 summit, which lends them a somewhat curved outline near the 

 summit; marked with numerous, very regular, slender, flexuous 

 axial ribs, of which 26 occur upon the first, 32 upon the second, 36 upon 

 the third and fourth, 40 upon the fifth, and 46 upon the penultimate 

 turn. The moderately impressed spaces enclosed between these ribs 

 are about as wide as the ribs, and are crossed by slender spiral threads, 

 of which about 13 occur between the sutures. The spaces enclosed 

 between the spiral threads and the axial ribs are a little wider 

 than the spiral threads and appear as well-impressed pits. Periph- 

 ery of the last whorl Avell rounded. Base somewhat prolonged, 

 well rounded, marked by the continuations of the axial ribs, which 

 become somewhat enfeebled anteriorly and 16 spiral threads; 

 the latter are a little more accentuated on the anterior portion than 

 they are upon the spire. Aperture irregularly ovate, somewhat 

 channeled anteriorly; posterior angle acute; outer lip moderately 

 thick, showing the external sculpture within; inner lip scarcely 

 differentiated from the body whorl, to which it is appressed; parietal 

 wall covered with a thin callus. 



The type, and four specimens, Cat. No. 186817, U.S.N.M., come 

 from Port Alfred (Coll. No. 183). The type has seven postnuclear 

 whorls, which measure : Length, 6.7 mm. ; diameter, 2.2 mm. Cat. No. 

 227738, U.S.N.M., contains 10 specimens from the same locality 

 (Coll. No. 833), and Cat. No. 227739, contains six specimens from 

 the same source (Coll. No. 834). 



Cat. No. 249707a, U.S.N.M., contains a badly worn specimen 

 (Coll. No. 979). 



RISSOINA, species? 



Cat. No. 249696, U.S.N.M., contains a badly worn specimen of a 

 small species from Port Alfred, having closely spaced, decidedly 

 protractive ribs and without spiral sculpture. It is too badly worn 

 to serve for a proper diagnosis (Coll. No. 968). 



