ZONITES. 157 



H. De NATALE, Benoit. PL 51, figs. 76-78. 



Openly umbilicated, discoidal, plane above, with very narrow 

 volutions, very minutely striulate and with microscopic spiral 

 lines, subopaque, yellowish corneous; whorls 7, with channeled 

 suture, last whorl much larger, slopingly depressed to a subbasal 

 peripheral angle, aperture subtriangularly lunate. 



Diam. 13 mill. 



Sicily, Pisa, etc. 

 II. Uzielli, Issel = II. Villae, Bonelli (non Mort.), is a s} T non3'in. 



II. POMELIANA, Bourg. PI. 50, figs. 62-64. 



Umbilicus moderate, shell discoidal, plane above, thin, sub- 

 diaphanous, narrowly striate, greenish corneous; whorls 6, nar- 

 row, suture channeled. Diam. 10 mill. 



Bona, Algeria. 

 H. CIRCUMLINEATA, Kustur. PL 50, figs. 65-67. 



Widely umbilicated, subdiscoidal, thin, hyaline, with close 

 spiral stria? above ; whorls 5, narrow, suture deeply impressed. 

 Diam. 5'5 mill. 



Dalmatia. 

 Veiy distinct by its spiral sculpture. 



H. ZAPATERI, Hidalgo. PL 50, figs. 68-70. 



Umbilicus moderate, shell thin, pellucid, somewhat shining, 

 almost smooth, corneous, suture rather deep; whorls 5^, narrow, 

 slowly enlarging, the last very obtusely angulated, base convex, 



subplanulate. Diam. 10 mill. 



Belalcazar, Spain. 



Partakes somewhat of the characters of a Patula. 



H. ISSERICA, Letourneux. PL 50, figs. 71-73. 



Discoidal, with carinated periphery, planulate or slightly con- 

 cave above, more convex, with moderate umbilicus below, 

 fragile, sub pellucid, narrowly striate, corneous above, becoming 

 milk}' white on the base ; whorls 6, suture impressed, whorls 

 narrow, slowly enlarging, the last much dilated, convexly declin- 

 ing above, convex below, aperture angularly lunate. 



Diam. 14'5 mill. 



Kdbylia. 

 H. SVJBPLICATULA, Bourg. PL 50, figs. 74, 75. 



Rather narrowly umbilicated, depressed, pellucid, shining, 



