682 PKOCEEDINGS OF THE ACADEMY OF [1900. 



Ushirohawa, prov. Tosa, Shikoku Island (Mr. Y. Hirase). 



This species seems most nearly allied to C. ignobilis Sykes and 

 C. subaurantiaca Pils. The former species, also from Shikoku 

 Island, differs in the emerging inferior and subcolumellar lamellse; 

 is rather less attenuated above, judging by the figure, but is of 

 about the same size. 1 C. subaurantiaca is a more slender, smoother 

 species, in which the straighter lunella is united with the middle 

 of the upper palatal plica. In C. aurantiaca Bttg. the lunella 

 is I-shaped, and ventral in position, quite unlike the bow-like and 

 lateral lunella of C. shikokuensis. 



EXPLANATION OF PLATES. 



(Figs. 2, 5, 8, 10, 14, 20, 23, 24. 31 are natural size ; the others enlarged.) 



PLATE XXIV. 



Figs. 1, 2, 3. Clausilia (Euphcedusa) comes n. sp. 



Figs. 4, 5, 6. Clausilia (Euphcsdusa) monelasmus n. sp. 



Figs. 7, 8, 9. Clausilia (section ?) iotaptyx n. sp. 



Figs. 10, 11, 12. Clausilia (Tyrannophcedusa) Mikado n. sp. 



Figs. 13, 14, 15. Clausilia (Stereophcedusa) hondana n. sp., type. 



Figs. 16, 17. Clausilia (Stereophcedusa) hondana varieties, 



prov. Suruga. 



Fig. 18. Clausilia (Stereophcedusa*) hondana variety, Bo- 



shiu. 







PLATE XXV. 



Figs. 19, 20, 21. Clausilia (Hemiphcedusa) Nolani n. sp. 



Figs. 22, 23, 24, 25. Clausilia (Hemiphcedusa) tosana n. sp. 



Figs. 26, 28. Clausilia monelasmus. Inner view of clausilium. 



Fig. 27. Clausilia monelasmus. Columellar view of clau- 



silium. 



Fig. 29. Clausilia monelasmus. Outer and basal view of 



clausilium. 



Figs. 30, 31, 32. Clausilia (Hemiphcedusa) shikokuensis n. sp. 



Figs. 33, 34. Clausilia (Zaptyx) Hirasei Pils. Clausilium 

 in profile from palatal side, and view of inside. 



1 In the figure of C. ignobilis, Proc. Malac. Soc. Lond. , I, p. 262, fig. 5, 

 the lunella is represented as connected with the plica principalis. Such a 

 structure would be unique in Japanese Hemiphcedusce, but I think it is 

 probably an error of the artist, and no such connection really exists. 



