190S.] NATURAL SCIENCES OF PHILADELPHIA. 585 



The clausilium (fig. 13) is bent rather abruptly near the filament; 

 parallel-sided, the apex rounded; the external face is somewhat 

 swollen, inside concave. It is excised on the columellar side near the 

 filament. 



Nase, Oshima (Osumi). Types No. 95681 A. N. S. P., from No. 

 1505 of Mr. Hirase's collection. 



With a general resemblance to Clausilia dadoptyx, this species is 

 entirely distinct from all known forms in the structure of the closing 

 apparatus. 



Explanation of Plates XXX, XXXI, XXXII. 



Plate XXX— Fig. 1 — Clausilia idioptyx Pils. 

 Fig. 2 — Clausilia nakanoshimana Pils. 



Fig. 3- 

 Figs. 4, 5- 

 Fig. 6— 

 Fig. 7— 

 Figs, 8, 9- 

 Fig. 10— 

 Figs, 11, li 



tokarana Pils. 



tokarana saccatibasis Pils. 



hemileuca Pils. 



echo Pils. 



japonica ultima Pils. 



nakadce Pils. 



japonica vespertina Pils. 



Plate XXXI — Figs. 1, 2 — Clausilia tripleuroptyx Pils. 



Figs. 3-5 — Clausilia jacobianajacobiella Pils. Akusekijima. 



Fig. 6 — " " " Pils. Suwanosejima. 



Fig. 7— " nishinoshimana Pils. 



Figs. 8-10 — • " ikiensis tsushimana Pils. 



Fig. 11 — " hemileuca Pils. 



Figs. 12, 13— " agna spicata Pils. 



Figs, 14, 15 — " tosana Pils. Nametoko, lyo. 



Figs, 16, 17 — " " " Ushirohawa, Tosa. 



Figs, 18, 19— " " " Sliimohanyama, Tosa. 



Fig. 20 — " " " Irazuyama, Tosa. 



Plate XXXII — Figs. 1, 2, 3 — Clausilia formosensis hotawana Pils 

 Fig. 4 — Clausilia formosensis H. Ad. Arikawa. 

 Figs, 5, 6 — " taiwanica Pils. 

 Fig. 7 — " sivinhoei H. Ad. I-uirun. 



Figs. 8, 9 — " formosensis H. Ad. Hotawa. 

 Figs. 10, 11 — »" sioinhoei H. Ad. Suganiikei. 



