ZONITES. 191 



white below, suture impressed; whorls 6, subplanulate, regularly 

 slowly increasing, the last subdilated, depressed, periphery 



rounded. 



Sicily. 



H. obscurata, Benoit, non Porro. 



II. ISSELTANA, Paulucci. PI. 57, figs. 15-17. 



Rather narrowly umbilicated, depressed, planulate above, thin, 

 fragile, rugosely striulate, olivaceous corneous ; whorls 5^, at first 

 slowly, afterwards rapidly increasing, suture profound, last whorl 

 planulate above, compressed below. Diam. 15'5 mill. 



Central Italy. 

 II. MERIDIONALIS, Paulucci. PI. 58, figs. 20-22. 



Rather widely umbilicated, depressed, planorbiform, planulate 

 above, thin, fragile, pellucid, yellowish olivaceous, lighter colored 

 below ; whorls 5 J-6, regularly increasing ; the last wider, com- 

 pressed, subdilated towards the aperture, a little descending, 

 suture well-impressed. Diam. 15 mill. 



Central Italy. 

 II. INCERTA, Drap. PI. 57, figs. 18, 19. 



Moderately umbilicated, shining, smooth, striulate, brownish 

 corneous above, yellowish white below, suture impressed, minutely 

 wrinkled ; whorls 5J, periphery rounded. Diam. 18 mill. 



Southern France. 



Formerly confounded with H. olivetorum, Gmel., but is smaller, 

 more globose, with narrower umbilicus, etc. 



Yar. VAFRA, Westerlund. 



Olivaceous corneous above, dark greenish below, last whorl 

 wide, aperture ovately lanate, columellar margin widely expanded 

 above, spire produced conoidal. Diam. 26 mill. 



Bayonne. 

 H. SUPERFLUA, Rossmiissler. PI. 58, figs. 23-25. 



Umbilicated, depressed, rather solid, with incremental striae 

 above, decussated by very minute spiral lines, diaphanous, some- 

 what shining, cinnamon-color, spire rather plane, suture im- 

 pressed ; whorls 5J-6, somewhat convex, the last whorl striate 

 and white on the base. Diam. 18 mill. 



Ins. Crete. 



