I 



ZONITES. 171 



H. PERDITA, Desh. PL 53, figs. 15-17. 



Umbilicus moderate, shell subdiscoidal, shining, light yellow- 

 ish, li3 T aline ; whorls 4, narrow, slowly increasing, a little flattened 



on the base. Diam. 3 mill. 



Near Pekin, and Eastern Mongolia. 



II. DOENITZII, Reinh. PL 53, figs. 18-20. 



Narrowly perforate, thin, polished, veiy lightly striulate, 

 amber-colored, whitish below ; whorls 5 J, slightly convex, regu- 

 larly increasing, suture white-margined. Diam. 7 mill. 



Japan. 

 II. RADIATELLA, Reinhardt. PL 53, figs. 21-23. 



Narrowly perspectively umbilicated, fulvous corneous, shining, 

 radiately striate ; whorls 3J, rapidly increasing, tlie last double 

 the width of the penultimate, suture narrowly margined. 



Diam. 3 mill. 



Japan. 



II. YESSOENSIS, Reinh. PL 53, iigs. 24-2C.. 



Perspectively umbilicated, corneous, somewhat shining, irreg- 

 ularly striated ; whorls 4-| f), a little convex, with deep suture, 

 periphery subangulated, base more convex. Diam. fi'75 mill. 



Japan. 



Un figured Species. 



H. SINULABRIS, Martens. Siam. 



II. MITIS, Pfr. Lao Ms., Cambodia. 



H. ARCTISPIRA and H. OBTUSA, Westerlund. Japan. 



(Section ZONITOIDES, Lehmann, 1864. 



II. NITIDA, Miiller. PL 53, figs. 27, 28, 29-32. 



Moderately umbilicated, thin, shining, yellowish corneous, 

 delicately striate, pellucid ; whorls 5, a little convex, rather 

 slowly increasing, periphery compressed and almost obtusety 

 angulatecl, base excavated around the umbilicus. 



Diam. 7*5 mill. 



Europe ; United States, Japan and Australia (introduced). 



The S3 r nonyms are H. hydrophila, Ingalls (for American spe- 

 cimens); H. tennis, Dillw.? H. succinea, Stud.; H. nitescens, Andz. 



