ZONITES. 151 



II. DEILA, Uuurg. PL 49, figs. 60-71. 



Narrowly umbilicatecl, with impressed umbilical region, finely 

 striate, moderately solid, fulvous olivaceous, olivaceous-white 

 below ; whorls 6, regularly slowly enlarging, aperture large, 

 semi-rounded. Diam. 17 mill. 



Near SebastopoL Crimea. 



H. deila (figs. 66-68) was described from a specimen not fully 

 adult, 11 mill, diam.; subsequently Clessin describing an adult 

 specimen, thought proper to give it a new name //. Krynicki 

 (figs. 69-71). 



II. MARGARITACEA, Schmidt. PL 49, figs. 72-74. 



Widely umbilicatecl, thin, rather smooth, bluish white, dia- 

 phanous ; whorls 4J, the last neither dilated nor deflected, mouth 

 Innately rounded, peristome fragile, repand. Diam. 10'5 mill. 



Aschersleben, Germany, Denmark? 



Some conchologists have considered this an albino of H. cel- 

 laria. 



II. SCOTOPHILA, Stefuni. PI. 49, figs. 75-77. 



Umbilicus small, profound, shell subplanulate, rather solid, 

 smooth, shining, pellucid, yellowish corneous above, whitish 

 below, irregularly lightly striate ; whorls 5, regularly enlarging, 

 suture distinct, last whorl a little declined, scarcely or not at all 

 descending at the aperture. Diam. 10'5 mill. 



Sienna. 



Is H. Aquitanica of Bonelli and Martens (non Charp.). 



II. ERCICA, Benoit. PL 49, figs. 78-80. 



Moderately umbilicatecl, polished, diaphanous, dark olivaceous 

 corneous; whorls 5, suture impressed. Diam. 10 mill. 



Sicily, Calabria. 



Benoit first called it H. glaberrima a name several times pre- 

 occupied. 



II. PLANELLA, Pfr. PL 49, figs. 81-83. 



Rather narrowly umbilicated, subdiscoidal, fragile, rugulosely 

 striate, corneous, spire subplanate; whorls 5, suture impressed, 

 last whorl wider, somewhat depressed, periphery obsoletely 

 angulate, base somwhat plane. Diam. 10 mill. 



Sicily. 



