1882.] 0. F. von Mollendorff — On a collection of Japanese Clausiliae. 5 

 9. Clatjsilia ducalts. 



1876. Clausilia ducalis, Kobelt, Jahrb. D. M. G. iii, p. 152, t. v, f. 7. 



1877. Bottger, Claus. Stud. p. 63. 



1878. Syst. Verz. p. 56. 



1879. Kobelt, Fauna Jap. p. 83, t. viii, f. 10. 



Two magnificent specimens of a Megalophaedusa from Hakoni agree 

 fairly well with Kobelt's diagnosis and figure of Clausilia ducalis. They 

 are, however, longer — 38 millim. instead of 36, — of a dark chestnut colour 

 with a slight violet tint, not " yellowish horn-coloured" {liiteo- cornea) as 

 Kobelt describes his G. ducalis^ and the subcolumellar lamella is completely 

 immersed so that it can only be seen by holding the shell in an oblique 

 position. There being but two specimens known of Clausilia ducalis., ib 

 seems advisable to class the specimens collected by Mr. Hungerford with 

 that species provisionally, although they may deserve a new name as a 

 variety. 



d. Group of Clausilia cylindrica, Gray = Cylindirophaedusa, Bottger (Claus. Stud. 

 p. 64). 



10. Clausilia gracilispira, n. sp., PI. I, Fig. 3. 



Testa elongato-fusiformis, subcylindrica, tenera, pellucida, suhtiliter 

 costulatO'Striata,viridiflava, anfractus 10-11 sulplani suturd v aide distinct a 

 discreti ; apertura parva, suhohli^ua, rotundato-piriformis, peristoma con- 

 tinuum solutum, superne leviter sinuatum, hreviter expansum. Lamella 

 jparietalis supera onarginalis, ohliqua, satis valida, cum spirali continua, 

 infera remotissima^ vix conspicua, suhcolumellaris immersa ; plica princi- 

 palis mediocris, lunella nulla, plicae palatales tres quarum prima et tertia 

 suhaequales, media hrevis, Clausilium angustum linguiforme^ acumina- 

 tum. 



Alt. 9| — \^\, diam. 2, apert. long. 2, lat. 1^ millim. 



Hab. Near Kobi. 



A very well-marked species, which I can only compare to Clausilia 

 cglindrica, Gray. The slender, subcylindrical shape, the small aperture, 

 the absence of a lunella, the very remote and oblique lower parietal lamella, 

 the immersed subcolumellar lamella indicate its relation to the group 

 Cylindrophaedusa created by Bottger for CI. cylindrica. It differs, besides 

 size, shape, colouring, and sculpture of the shell, by the spiral lamella com- 

 pletely continuous with the lamella supera instead of " fere contigua," by 

 the tliree palatal plaits instead of two. I think, therefore, that the Japanese 

 species has to be placed in the group Cylindrophaedusa. The clausilium 

 is like that of the next group, Hemipliaedusa. 



Before passing on to the last-named group, I shall here enumerate two 

 new species which do not very well agree with any of Bottger's subsections 

 of Phaedusa, and for which I should propose to make a new group, if I 



