1907.] NATURAL SCIENCES OF PIIILADKLI'JIIA. 499 



NEW CLAUSILIIDiE OF THE JAPANESE EMPIRE-XI. 

 ^^Y HKXRY A. I'lLSliKV. 



The present ])aper^ deals chiefly with species of the Ryukyu Islands 

 and Formosa, and especially with an interesting series of very small 

 Clausilicc relat(Ml to Zaph/x. This series no\v comprises some twenty- 

 nine species, all but one of them discovered by Mr. Hirase and his 

 assistants. No member of tlie Zaptychoid group has been recognized 

 in Cliina. All are insular; and being among the most specialized of 

 all Clausilia^ in structure, they indicate a greater antiquity for the 

 Ryukyuan fauna than zoogeographers have generally been disposed 

 to atlmit. 



Section MEGAL(3PH.T:r)USA Btt-. 

 Clausilia martensi concrescens n. subsp. 



In this form the spaces between the palatal plica) are filled up, 

 making a straight lunella with slightly uneven edge. Cuticle greenish 

 yellow. Length 35, diam. 8.5 to 9 mm. 



Shishikui, Awa, Shikoku Island. Types No. 90,044, A. N. S. P., 

 from No. 1,189 of Mr. Hirase's collection. 



Section LUCHUPHJ^DUSA Pils. 



To the nine species of this section already known two are now to 

 be added. 

 Clausilia inolyta n. sp. PI. XXXII, figs. 1-4. 



Shell rather slender, gradually and regularly tapering from the 

 penultimate whorl to the small apex; extremely thick and solid ; grayish 

 white, being denuded of cuticle throughout; very coarsely sculptured icitk 

 Htrong straight rounded ribs nearly as wide as their intervals, about 24 

 or 25 in number on the last whorl, and not coarser on its back. Whorls 

 about 11, moderately convex, the last smaller than the penultimate, 

 its last half compressed. Aperture small, vertical, ]:)ii-iform ; peristome 



* This is the eleventh paper treating exclusively of Japanese Clausiliidaj col- 

 lected by Mr. Hinvse. Seven of them appeared under tlie title "Additions to 

 tlie Japanese Land Snail Fauna," the rest under various titles. A list of them 

 is appended to this paper. In all 10,5 pages, and 31 plates containing 535 figures 

 drawn by tlie author, have been published. 



