AEROPE. 131 



obliquely flattened above, more convex below, umbilicus mod- 

 erate, perspective. Diam. 12, alt. f> mill. 



Natal, So. Africa. 

 Yar. /9, MINOR. Striae less marked. 



Mr. Binney writes of this, that it "is placed by von Martens in 

 Pella, a subgenus of Helix. On examining the animal, however, 

 I find it has no jaw, and that its lingual membrane presents the 

 usual characters of Rhytida. Mr. Gibbons informs me ' that the 

 animal wants the characteristic labial palpi of the latter genus.' 

 There appears to be no central tooth." (Ann. N. Y. A cad. Sci., 

 355, 1879.) 



Genus AEROPE, Albers, 1860. 



A. CAFFRA, Ferussac. PL 25, figs. 13, 14. 



Perforate, inflated, thin, fragile, costulate-striate ; greenish 

 irregularly strigate with greenish brown ; whorls 4 ; aperture 

 large, somewhat pearly within. Diam. 51, alt. 30 mill. 



Gape of Good Hope. 

 Yar. WESSELLTANA, Maltzan. Fig. 14. 



Covered perforate, last whorl more obliquely depressed, incre- 

 mental striae smaller ; aperture oblique. 



