172 ZONITES. 



Var. BOREALIS, Clessin. Figs. 29, 30. 



Shell depressed, spire but little elevated, suture deep. 

 Diain. fi mill. 



Northern Sweden. 

 Var. PARISTACA, Mabille. Figs. 31, 32. 



France, Norway. 



Unffjured Species. 

 II. OLTISTANA, Fagot. S[xiin, HaiKjary. 



H. NORVEGICA, E sin ark. Norway. 



II. LOANA, Gredler. China. 



Section NAUTILTNUS, Mousson, 1872. 



H. CLYMENE, Shuttlew. PI. 53, figs. 33, 34. 



Minute, widely umbilicated, depressed, discoidal, thin, smooth, 

 diaphanous, brownish corneous, a little shining, spire immersed ; 

 whorls 3, rapidly increasing, convoluted, the last large, inflated, 



very slightly deflected in front. Diam. 2 mill. 



Teneriffe. 



Its habit is different from the Hyalinre generally, living in wet 

 moss, associated with Physa, Ancylus, Htjdrocena, etc. 



Section CONULUS, Fitzinger, 1833. 



Dr. Kobelt, in considering the Conulus section so numerously 

 represented in Japan, has proposed three groups, distinguished 

 as follows : 



I. DISCOCONULUS. Contains depressed forms, with narrow 

 whorls and no carina. H. sinapidium, H. ampla, of Japan, II. 

 spiriplana of China, and H. Gundlachi of Cuba. 



II. EUCONULUS. The bullet-shaped species, without keel or 

 only a slight one. H. fulva of Europe, H. pupula, pustulina, 

 phyllopliila and incerta. Most of the Asiatic and American 

 species belong here. 



III. TROCHOCONULUS. Usually troc Inform, plainly keeled. H. 

 acutangula, H. labilis, H. tenera and H. obtusangula of Japan are 

 examples (Silzb. Berlin, 82, 1883). 



I have not adopted these divisions, mainly because of the 

 variability of H. fulva, the best known species, extreme forms 

 of which might enter the third group, whilst the t}q)e belongs to 

 the second. 



