1901.] NATURAL SCIENCES OF PHILADELPHIA. 651 



Var. KIIENSIS Pils. Kurozu, Nachi and Tomisato, Prov. Kii 

 (Hirase). 5 



Group of C. ptychochila. 



C. BERXARDII Pfr. [Siam ? Riukiu Islands ?] 

 r. CRENILABIUM Pils. Prov. Kunchan, Okinawa (Hirase). 

 C. PIYCHOCHILA Bttg. [China ? Riukiu Islands ?] 

 C. EXCELLENS Pfr. ( C. prceclara Old. preoc.). Okinawa 

 (U. S. N. P. Exp.). 



Group of C. Pinto. 



C. PINTO Pils. Tane-ga-shima, Osumi (Hirase). 

 C. PTYCHOCYMA Pils. Tane-ga-shima, Osumi (Hirase). 

 Var. YAKUSHIMJE Pils. Yaku-shima, Osumi (Hirase). 



Group of C. munus. 

 C. MUNUS Pils. Oshima, in the Riukiu Islands (Hirase). 



Section ZAPTYX Pilsbry. 



C. HIRASEI Pils. Kagoshima and Sakura Island, Satsuma 



(Hirase). 

 Var. KIKAIENSIS Pils. Kikaigashima, Osumi (Hirase, Nos. 557, 



5576X 



C. HYPEROPTYX Pils. Okinawa; Yaeyama (Hirase). 

 C. HACHIJOENSIS Pils. Hachijo Island, Izu. 



Section TYRANNOPH2EDUSA Pilsbry. 

 Group of C. mikado. 



C. MIKADO Pils. (C. omiensis Mlldff. ). Ibuki, Omi, and Akas- 



aku, Miuo (Hirase). 

 C. IOTAPTYX Pils. Ibuki and Ryozen, 6 Omi (Hirase). 



Var. CLAVA Pils. Senzan, Awaji; Ikoma, Kii (Hirase). 

 C. ORTHATRACTA Pils. Akasaka, Mino (Hirase). 



5 Smaller than platydera ; more swollen below and more attenuate above- 

 Whorls 8-10. Length 16-17, diam. 4} mm. 



6 Specimens of C. iotaptyx f rom Ryozen, Omi, have 12 to 13 whorls, but 

 otherwise are like the types from Ibuki, Omi. The shells from Ikoma, Kii, 

 are somewhat intermediate between iotaptyx and clava, but nearer the latter. 



