1901.] NATURAL SCIENCES OF PHILADELPHIA. 465 



ADDITIONS TO THE JAPANESE LAND SNAIL FAUNA, IV. 

 BY HENRY A. PILSBRY. 



lu the present coninmnicatiou the description of Japanese 

 Clausiliidie is continued, and that of the Pupidce begun. The 

 genesis of ^a^m-like forms in Japan is considered in some detail, 

 together with various other divergent branches from the Euphsedu- 

 soid phylum. 



For most of the material described I am indebted to the liber- 

 ality of Mr. Y. Hirase, a corresponding member of this Academy. 



Mr. E. R. Sykes also has entrusted to me certain specimens col- 

 lected in Japan by Dr. Hungerford, many years ago, representing 

 species described but not figured by Dr. O. von Mollendorff; and 

 I have included herein some account of such of these as are closely 

 related to my new forms. IMy thanks are due to both of these 

 co-workers for their kind assistance. 



Section ZAPTYX Pils. 



Proc. A. N. 8. P., 1900, p. 672. 



This strongly differentiated group has hitherto been known from 

 southern Kiushiu and the Loo Choo Islands only ; but a represen- 

 tative has now been found to the north and east in an island 

 belonging to the province of Izu, I have attempted below to 

 explain its presence there. 



Typical Clausilia (Zaptyx) Hirasei occurs at Kagoshima, the 

 type locality, and on Sakura Island in Kagoshima Bay. A more 

 slender form, of a richer, darker brown color, but the same internal 

 structure, has been sent by Mr. Hirase (No. 557) from Kikai,^ 

 Osumi, at the head of Kagoshima Bay. Many specimens are 

 very small, length 7^ mm., but others reach 10 J mm. in length. 

 As the shell is quite slender, this is one of the smallest Clausilias 



^ In treating of Eulota cormivens, Proc. Malac. Soc. Lond., IV, p. 77, 

 Mr. Glide has confused this locality with the island Kikai-ga shima, of the 

 Oshima group, south of Kiushia. This island is in the Loo Choo group, 

 broadly speaking, but belongs for administrative purpeses to Kagoshima 

 Ken or prefecture. 



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