142 ZONITES. 



shining ; whorls 6, rather flattened, umbilical region impressed, 

 aperture very narrowly lunar. Diam. 4*7 mill. 



Middle and Northern Europe. 



It is H. hyalina, Fr. (figs. 44-46;, H. contorta, Held., and //. 

 vitrea, Bielz. 



Yar. REITTERI, Bottger. PL 46, figs. 47, 48. 



Very narrowly perforate, spire slightly convex; whorls 4^-5, 

 distinctly striated at the suture. Diam. 2'75 mill. 



Ins. Lesina, Dalmatia. 



This variety has been considered identical with H. subrimata, 

 Reinhardt which the Marchioness Paulucci makes a variety of 

 H. diapliana. 



H. PETRICOLA, Paulucci. PL 46, figs. 49, 50. 



Perforate, convex, depressed, whitish, crystalline, fragile, 

 shining, polished, very slightly striulate above, smooth below ; 

 whorls 5-6, subconvex, regularly rapidly enlarging, suture pro- 

 found, margined. Diam. 3'25-4'25 mill. 



Isl. Sardinia. 

 H. ERJAVECI, Brusina. PL 47, figs. 54, 55. 



Imperforate, thin, hyaline, shining, very slightly irregularly 

 striate ; whorls 6J-7, very slowly enlarging, with impressed 

 suture, last whorl scarcely wider than the penultimate. 



Diam. 3-5 mill. 



Croatia, littoral Austria. 



Differs from H. diapliana in the slower increase of the whorls, 

 the last one not dilated, and in the narrower aperture. 



H. HILGENDORFI, Reinhardt. PL 47, figs. 56-58. 



Imperforate, whitish, diaphanous, lightly striate, somewhat 

 convex ; whorls 4^, moderately increasing, the last dilated, suture 



narrowly margined. Diam. 2'75 mill. 



Japan. 



H. MICRODISCUS, Reinhardt. PL 47, figs. 59-61. 



Imperforate, narrow whorled, whitish diaphanous, rather flat- 

 tened above, more convex below ; whorls 3-^-4, regularly enlarg- 

 ing, the last a little dilated, suture narrowly margined. 



Diam. 1*5 mill. 



Japan. 



