SOUTH AFRICAN MARINE MOLLUSKS. 17 



marked by 10-12 prominent, broad, low, rounded, somewhat pro- 

 tractive axial ribs which are truncated posteriorly by the channel, their 

 terminations forming cusps. Intercostal spaces about twice as wide 

 as the ribs. The ribbed portions of the whorls on the spire are 

 covered by five, equal and equally spaced, incised, spiral lines. Sum- 

 mit of the whorls appressed, rendering the sutures ill defined. Base 

 of the last whorl moderately long, marked by the feeble continua- 

 tions of the axial ribs and on the posterior half by five incised spiral 

 lines equaling those on the spire in strength and spacing and forming 

 a continuous series with them. Anterior portion of base with about 

 seven ill -defined spiral lirations. Aperture narrowly elongate pyri- 

 form, sinus shallow immediately below the sutures; outer lip some- 

 what sinuous; columella strong, slightly sigmoid. The coloration 

 of the type consists of a creamy white ground, which is almost un- 

 marked in the subsutural channel and on the anterior half of the base 

 on the last turn. A few dots of brownish orange appear near the 

 summit between the ribs of the preceding whorls. The ribbed por- 

 tion of the whorl between the anterior and posterior portion of the 

 base is strongly mottled with brownish orange in the intercostal 

 spaces, less so on the summits of the ribs, while a little posterior to 

 the middle the base is marked by two slender spiral lines of the 

 same color. 



The type, Cat. No. 18796, U.S.N.M., has lost the early whorls; the 

 four and one-half remaining measure : Length, 1 3 mm. ; diameter, 7 mm. 

 It comes from Port Elizabeth. 



CLIONELLA SEMICOSTATA Kiener 



Cat. No. 16913, U.S.N. M., one specimen from Cape of Good Hope. 



CLIONELLA TURTONI, new species. 

 Plate 2, fig. 2. 



Shell fusiform, covered with thick brownish olive epidermis. 

 (Nuclear whorls decollated.) Post-nuclear whorls flattened except- 

 ing the contraction of the anal sulcus, which is a little anterior to the 

 posterior third of the space between the sutures; slightly shouldered 

 at the summit. Subsutural cord well rounded, marked by feeble 

 extensions of the ribs, which have a retractive slant. Anal sulcus a 

 mere constriction. Posterior to the sinus the last whorl is marked by 

 very low, poorly developed, somewhat sinuous protractive axial ribs, 

 each of which bears a weak nodule at the sulcus. In addition to the 

 axial ribs the entire surface of the spire and base is marked by numer- 

 ous strong lines of growth and spiral striations, the combination of the 

 two giving the surface a finely reticulated appearance. Sutures 

 strongly marked. Periphery of the last whorl well rounded. Base 

 moderately long with a slender fasciole at the insertion of the col- 



