1902.] natural' SCIENCES OF PHILADELPHIA. 533 



EXPLANATION OF PLATES XXVII AND XXVIII. 

 [Note.— All figures of corresponding parts are drawn to the same scale.] 



Plate XXVII, Figs. l-d.—Clausilia kttroztiensis. Kurozu, Kii. 



Fig. 4. — Diagram of palatal armature of another specimen. 



Figs. 5-7. — Clausilia pachyspira. Miyai, Kii. 



Figs. 8, 9. — Clausilia plagioptyx. Goto Hizen. 



Fig. 10.— Clausilia plagioptyx. Palatal armature of another spe- 

 cimen. 



Figs. \\-\^.— Clausilia oostoma var. goniopoma. "Wakayama, Ku. 



Figs. 15-18.— Clausilia oostoma MlldlF. (Type of C. japonica var. 

 suritgm'FWs..) Mikuriya, Suruga. 



Figs. 19, 20.— Clausilia oostoma var. dactylopoma. Kashio, 

 Awaji. 



Plate XXVIII, Figs. 1^-2'i.— Clausilia sieloldiYdiX. diptyx. Toyon- 

 ishikami, Nagato. 

 Figs. 2^21.— Clausilia neniopsis. Oshima, Osumi. 

 Figs. 28-^0.— Clausilia rowlandi. Garukawa, near Sapporo, Yesso. 

 Figs, ^l-'db.— Clausilia digonoptyx. Manabe, Hitachi. 

 Figs. 36, Zl.— Clausilia tau. Clausilium of a specimen from Kyoto. 

 Figs. 2,8-A2.— Clausilia subaculus. Nagasaki. 

 Figs. A^-'^b.— Clausilia tau. Nohara, Yamato. 



