SOUTH AFRICAN MARINE MOLLUSKS. 125 



nodulose, spiral zones about the umbilicus. I am unable to identify 

 it with any of the described species, and it is too worn to serve for 

 a diagnosis of a new form. (Coll. No. 1375.) Cat. No. 187095, 

 U.S.N.M., contains another specimen from the same place. (Coll. 

 No. 639.) 



Family RISSOIDAE. 



Genus NODULUS Monterosato. 



NODULUS PERSPECTUS Smith. 



Cat. No. 186819, U.S.N.M., two specimens from Port Alfred 

 (Coll. No. 185). 



NODULUS AFRICANUS, new species. 

 Plate 31, fig. 5. 



Shell cylindro-conic, white. Nuclear whorls one and a third, 

 smooth, polished, well rounded. Postnuciear whorls rather high be- 

 tween the sutures, appressed at the summit, well rounded, excepting 

 the area immediately below the appressed summit on the later turns, 

 which is slightly concave. Entire surface marked by numerous, very 

 closely spaced, microscopic, spiral striations and exceedingly fine, re- 

 tractive lines of growth. Periphery of the last whorl well rounded; 

 base prolonged, moderately rounded; aperture subcircular; outer lip 

 thick, within shelving to a thin edge; inner lip reflected, almost ver- 

 tical; parietal wall covered by a thick callus which renders the peri- 

 treme complete. 



The type, Cat. No. 250422, U.S.N.M., comes from Port Alfred 

 (Coll. No. 1295). It has 4f postnuciear turns and measures: Length, 

 1 .4 mm. ; diameter, 0.6 mm. The present species differs from Nodulus 

 perspedus Smith by being cylindro-conic, instead of ovate, as well 

 as in other characters. 



Genus SABANAEA Monterosato. 



SABANAEA PYRRHA, new species. 

 Plate 6, fig. 7. 



Shell minute, ovate. Early whorls pale smoky brown, the later 

 ones white. Nuclear whorls apparently not differentiated from the 

 postnuciear turns. All the whorls well rounded, smooth, and ap- 

 pressed at the summit. Sutures feebly impressed. Periphery of the 

 last whorl obscurely angulated. Base short, almost concave in out- 

 line, impressed at the umbilical area, and slightly attenuated ante- 

 riorly. Aperture subcircular, with a very thick peristome. Posterior 

 angle obtuse; outer lip thick; inner lip very thick, curved and 

 appressed to the base; parietal wall covered with a thick callus, which 

 joins the posterior angle of the aperture to the inner lip. 



