SOUTH AFRICAN MARINE MOLLUSKS. 5 



Genus VOLVULA A. Adams. 

 VOLVULA, species? 



Cat. No. 250583, U.S.N.M., contains one specimen of this genus, 

 from Port Alfred, which unfortunately has lost part of the lip, which 

 renders positive identification impossible. (Coll. No. 1456). 



Family SCAPHANDRIDAE. 



Genus CYLICHNA Loven. 



CYLICHNA AFRICAN A, new species. 

 Plate 1, fig. 8. 



Shell, white, subcylindric, spire deeply sunken, giving the apex a 

 perforate appearance. The body whorl is somewhat contracted in the 

 middle, rendering the outline of the sides concave. The entire surface 

 is marked by slender, subequally spaced axial riblets, which give it 

 a finely fluted appearance. Aperture long, narrow posteriorly, 

 roundly expanded anteriorly; outer lip parallel to the parietal wall 

 except at the expanded basal fourth of the shell. The outer lip pro- 

 jects considerably above the summit of each preceding turn, marking 

 the highest elevation of each turn. The parietal wall of the last turn 

 is covered with a thin callus, which is continued posteriorly to form 

 the parietal wall of that part of the aperture which projects above 

 the summit of the preceding turn. The outside of the parietal wall 

 within the perforated top, is marked by the continuations of the 

 riblets. Columella with an inconspicuous oblique twist near the 

 middle, short, slender, finely curved, connected at the base with the 

 parietal callus. 



The type and three specimens, Cat. No. 187147, U.S.N.M., were 

 collected at Port Alfred (Coll. No. 694). The type measures: Length, 

 3.4 mm.; diameter, 1.4 mm. 



This species resembles Cylichna hoernesi Weinkaufffrom the Mediter- 

 ranean. It is, however, a little less contracted posteriorly, has the 

 outer lip extending much higher posteriorly, and lacks the fine stri- 

 ations of the spire as well as the strongly incised spiral lines of the 

 base. 



CYLICHNA TUBULOSA Gould. 



Plate 3, fig. 5. 



Cylichna tubulosa Gould, Proc. Bost. Soc. Nat. Hist., vol. 7, p. 40, 1859. 



Shell cylindric, a very little wider anteriorly than posteriorly, white 

 or creamy yellow. Spire submerged and covered; posterior end 

 slightly concave, the highest portion being in line with the backward 

 continuation of the outer lip. Left outline of the body whorl almost 

 straight, curving gently toward either end. Inner lip quite evenly 

 80737°— Bull. 91—15 2 



