470 PROCEEDINGS OF THE ACADEMY OF [July, 



" Mikuriya, prov. Suruga (Y. Hirase). Types Ko. 79,724 Coll. 

 A. K S. P., No. 563 of Mr. Hirase' s collection. 



This species is one of the most extraordinary modifications of the 

 Eupluedusan stock yet known. The large aperture resembles in 

 form that of no other Clausilia known to me, and shows but one 

 lamella, the inferior; the superior lamella being wholly atrophied, 

 and the spiral lamella and principal plica reduced to short laminpe 

 in the region where the clausilium lodges. There is no trace of a 

 lunella. The clausilium remains well developed, is slightly thick- 

 ened distally, and has all the characters of that of Eujjhcedum. 



In the strong development of the inferior lamella, C. euholostoma 

 resembles C. Hungerfordiana IMlldff. and C. moneloismus Pils., 

 which are likewise deficient in the superior lamella. C. euholo- 

 stoma agrees with the typical forms of Reinia in having the aper- 

 ture wide above, not piriform as in the group of C. Hunger- 

 fordiana. It is intermediate between the two groups in number 

 of whorls and in general contour. 



Sectioa EEINIA Kobelt. 



Seinia Kob., Jahrb. d. D. Malak. Ges., Ill, 1876, p. 34, proposed as a 

 section of Balea ; type Balea variegata A. Ad. 



The type of Reinia is a small tapering-pupoid species, with 

 discontlnuom peristome, the aperture being Buliminoid, deficient in 

 lamelhT and ivitliout pliae, lunella or clausiluim. It was included 

 by Bottger next to Balea; but that group as usually constituted 

 consists of no less than three series of species, each totally dis- 

 tinct and unrelated. 



It was Dr. O. von MollendorfT who with keen insight first 

 pointed out the fundamental distinction between Balea and 

 Reinia.^ He recognized in the Chinese C. eastlakeana a less 

 modified form of Reinia, and after discussing the characters of the 

 groii]), declared it to be related to the eastern Asiatic grou]) 

 Fhcedusa. The relation of Reinia to Phcedusa, von jMollendorfi^ 

 further held, is comparable to that of Alopia to the true Clausilia 

 of Europe: " Phylogenetisch diirfte Reinia als der lebende Rest 

 der Vorfahren der heutigen Phceditsa- Avien aufzufassen sein, wie 



2 Jahrb. d. D. Malak. Ges., X, p. 2G2-205, 1833, under description of C. 

 eastlakeana, a species from Fu-dshow, on the island Nan-tai, province of 

 Fu-dshien, southern China. 



