VITRINA. 157 



Y. CORNEA, Pfr. PI. 34, figs. 92-94. 



Globosely depressed, very thin, striulate, pellucid, light 

 corneous; whorls 4, the last wide, subdepressed ; aperture 

 obliquely lunar, columellar lip shorly reflected-appressed above. 



Diam. 16, alt. 9 mill. 



Natal, So. Africa. 



Yar. fa with a chestnut line on the periphery. 



Y. PLANTI, Pfr. 



Depressed above, very thin, smooth, pellucid, very shining, 

 yellowish hyaline ; spire plane, suture submargined ; whorls not 

 3, flattened, the last large, inflated below, membraneously mar- 

 gined. Diam. 12, alt. 6 mill. 



Natal, So. Africa. 



Unfigured. Differs from the other species by its nearly plane 

 spire. 



Y. PELLTCULA, Per. PL 34, figs. 95, 96. 



Depressed globose, thin, diaphanous, yellowish white, with 

 the suture narrowly chestnut-margined ; whorls 3^-4, the last 

 somewhat inflated ; aperture lunate-rounded. 



Diam. 13, alt. 9 mill. 



Cape of Good Hope. 



Y. MADAGASCARIENSIS, E. A. Smith. PL 35, figs. 100, 1. 



Imperforate, depressed, very thin, diaphanous, pale greenish 

 yellow, the suture and upper part of the outer lip stained 

 brownish, brilliantly glossy; whorls 3J, suture margined, first 

 whorl microscopically decussated, body-whorl large with dis- 

 tinct growth-lines, here and there subplicate, lower surface w r ith 

 indications of interrupted concentric striae ; lower part of 

 aperture-margin thin, wrinkled. Diam. 15'5, alt. 9 mill. 



Betsileo, Madagascar*. 



Y. BORBONICA, Morelet. PL 34, figs. 97-99. 



Depressed, transversely oblong, thin, diaphanous, shining, 

 greenish yellow, very lightly striate and inconspicuously decus- 

 sated ; whorls 3^, suture margined, last whorl large, dilated; 

 columellar lip narrowly membraneous, reflected above, forming a 

 narrow slit over the umbilical region. Diam. 11, alt. 5 mill. 



Isle of Bourbon. 



