SOUTH AFRICAN MARINE MOLLUSKS. 165 



posterior two cords on the base. Umbilicus broad and funnel shaped, 

 the umbilical wall being marked by three weak spiral cords. Aper- 

 ture irregular, ovate; outer and basal lips very thick, rendered sinuous 

 by the external sculpture; inner lip very thick, almost vertical, some- 

 what curved ; parietal wall covered b} r a moderately thick callus. 



The type and another specimen, Cat. No. 187109, U.S.N.M. (Coll. 

 No. 655), come from Port Alfred. The type has four postnuclear 

 whorls, and measures: Altitude, 4.5 mm.; greater diameter, 8 mm.; 

 lesser diameter, 7 mm. Cat. No. 227781, U.S.N.M. (Coll. No. 876), 

 contains three specimens from the same locality. Cat. No. 250513, 

 U.S.N.M., another specimen from the same place (Coll. No. 1386). 



CYNISCA AFRICANA, new species. 

 Plate 28, figs. 4, 5, 6. 



Shell small, white. Nuclear whorls a little more than two, smooth, 

 well rounded, separated by a well impressed suture. Postnuclear 

 whorls almost two, well rounded, ornamented between the sutures 

 by three strong spiral keels of which the first, which is a little anterior 

 to the summit, is nodulous. The deep grooves separating these 

 strong keels are a little wider than the keels. The axial sculpture is 

 reduced to exceedingly fine retractive lines of growth. Periphery 

 of the last whorl marked by a strong keel which equals the one pos- 

 terior to it in strength and is separated from this by a sulcus as deep 

 and broad as that which separates the keel posterior to it from its 

 posterior neighbor. Base deeply umbilicated, moderately well 

 rounded, marked by four strong spiral cords of which the last bounds 

 the umbilicus. This and the one next to it are tuberculated, while 

 the two posterior to it are smooth. The deep, broad sulci separating 

 these spiral cords are crossed by fine axial lines of growth. Aperture 

 oblique, oval; outer lip very thick; inner lip thick, decidedly curved; 

 parietal wall covered with a thick callus. 



The type and two specimens, Cat. No. 187098, U.S.N.M., come 

 from Port Alfred (Coll. No. 642). The type measures: Altitude, 2 

 mm.; greater diameter, 2.6 mm. This species resembles Cynisca 

 forticostata very much, but is at once distinguished from it by its 

 minute size. Cat. No. 250514, U.S.N.M., one specimen from Port 

 Alfred (Coll. No. 1387). 



Genus TEINOSTOMA H. and A. Adams. 



TEINOSTOMA AFRICANA Smith. 



Cat. No. 86884, U.S.N.M., contains two specimens from Port Al- 

 fred (Coll. No. 254). 



TEINOSTOMA ALFREDENSIS, new specie!. 

 Plate 28, figs. 7, 8, 9. 

 Shell small, white. Nucleus consisting of a single smooth turn. 

 Postnuclear whorls two and one-third, well rounded, marked by 

 80737°— Bull. 91—15 12 



