60 CURVELLA, SOUTH AFRICA. 



curved, transverse stride, which are crossed by a greater 

 number of regular, microscopic, spiral stride, the last whorl 

 being less than the spire ; aperture ovate ; labrum thin, simple, 

 well arched forward in the middle, labium thickened and 

 thrown back, quite covering and closing the umbilicus; colu- 

 mella slightly curved obliquely to the left ; callus-scar extend- 

 ing from the suture well above the columella, and com- 

 pletely covering the umbilical region. Long. 6.5, lat. 2.75 

 mm. (Burnup). 



Makowe, Zululand, Natal (J. Crosly). 



Curvella croslyi BURNUP, Proc. Malac. Soc. London, vi, 

 1905, p. 302, pi. 16, f. 3, 4. 



"This beautiful shell is much the largest of the South 

 African Curvellce yet discovered, and I have much pleasure 

 in naming it after the discoverer, Mr. J. Crosly. 



"It is a thin, white, shining shell of six whorls, of which 

 the last three are rather ventricose, and the upper three 

 flatter. The irregular transverse sculpture, following the 

 line of growth, which, -like the outer lip, is well curved for- 

 ward, is easily seen with a weak lens; while the fine spiral 

 sculpture is only visible under a strong magnifier. 



"With the type are four 'dead' specimens, probably not 

 quite mature, the largest measuring only 10.5 mm. in length, 

 in which the umbilicus is open and the callus not well de- 

 veloped, but in other respects they agree with the type. I 

 have -also before me two of the calcareous eggs which were 

 syringed from the shell ; they are white, nearly spherical, and 

 measure about 1.3 mm. in diameter" (Burnup). 



24. C. ELEVATA Burnup. PI. 8, figs. 29, 30. 



"Shell elongate-conic, umbilieate, pale ashy straw-color, 

 thin shining, translucent; with 6 slightly ventricose whorls, 

 not much impressed art the sutures, the apex being blunt, and 

 the last whorl 2.5 mm. of the length of the shell, very finely, 

 irregularly sculptured with curved, transverse striae, with 

 traces of microscopic spiral lines over the umbilicus; colu- 

 mella paler, nearly straight, slightly bent to the left. Long. 

 6.5, lat. 3 mm. (Burnup). 



