1901.] NATURAL SCIENCES OF PHILADELPHIA. 651 



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



(Hirase). 5 



Group of C. ptychochila. 



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

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

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

 C. EXCELLENS Pfr. ( C. prceclara Gld. 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. YAKUSHIM^E Pils. Yaku-shima, Osumi (Hirase). 



Group of C. munus. 

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



Section ZAPTYX Pilsbry. 



C. HIRASEI Pi]?. Kagoshima and Sakura Island, Satsuma 



(Hirase). 

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



557&X 



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

 C. HACHIJOENSIS Pils. Hachijo Island, Izu. 



Section TYKA^ 7 OPH^EDUSA Pilsbry. 

 Group of C. mikado. 



C. MIKACO 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 8J-10. Length 16-17, diam. 4 mm. 



6 Specimens of (7. iotaptyxfrow 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 iotaptyxand. clava, but nearer the latter. 



