62 O. F. V. Mollendorff — Ja^^ancse Land and Fresliivater Shells. [No. 1, 



not break up a specimen at the time, and by looking into the shell I must 

 have got an entirely erroneous view of the clausilium, w^hich is essential 

 for determining the subsection. Furthermore, I had only an imperfect 

 knowledge of Gl. brevior, which is not very well represented by the 

 figure in Kobelt's Fauna Japonica, but of which I have since received 

 authentic specimens. Gl. tetraptyx is a little larger (but this does not 

 matter much, as Gl. hrevior is rather variable in size), the colour is 

 brown with a reddish tint, whilst Gl. hrevior is pale horn-coloured, the 

 peristome is broader, slightly lipped and liver-coloured, its upper sinua- 

 tion somewhat deeper. The palatal plaits are somewhat longer and 

 farther up in the interior of the shell. Altogether I think Gl. tetra]jtyx 

 is hardly more than a variety of Gl. hrevior. 



I subjoin the description of a new form of this interesting little 

 group which Mr. F. W. Eastlake has discovered near Nikko. 



19. Clausilia nikkoensis, n. sp. 



Testa elongato-fusiformis, jpallide cornea, suhtiliter sed distincte 

 striata; anfr. \0\ — 11 convexiusculi ; apertura ovalis, parum ohliqua, 

 jperistoma continuum, superne soUitum jpaullum sinuatum, expansiusculum. 

 Lamella sujoera sat valida, marginalis, cum sjpirali continua, infera valida, 

 valde torta, intus suhfurcata, usque ad "inarginem producta, suhcolumellaris 

 einersa, ]jlica principalis elongata, palatales 5 hreves, superior et infima 

 paullo longiores. Clausilium latum, subtus rotundatum. 



Long. 18, diam. 3| mill. 



This species is distinguished from Gl. hrevior by the longer and 

 m.uch slenderer shell, the more elongate aperture with higher " sinulus", 

 the lower parietal lamella reaching the margin of the peristome, the 

 upper lamella being less high. 



Group Megalopliaedusa, Bottg. 



20. Clausilia martensi, HerHots,MS. — E. v. Martens, Mai. Bl. VII, 

 1860, p. 40; Albers-Mart., Hel. 1860, p. 275 ; Ostas. Landschn. 1867, p. 32. 

 Pfeiffer, Mon. Hel. YI, 1868, p. 494, VIII, 1877, p. 519. A. Adams, A. 

 & M. N. H. 4th ser. I, p. 469. Kobelt, Faun. Jap. p. 79, t. VIII, f. 1—4. 

 Gl. reiniana, Kobelt (olim) J. d. Mai. Ges. II, 1875, p. 330, t. 

 XII, f . 7-9, ibid., Ill, 1876, p. 154, t. V, f . 8. Pfeiffer, Mon. Hel. VIII, 

 1877, p. 471. Gl. yocoJiamensis, Crosse, J. de Conch. XXI, 1873, p. 68, 

 t. V, fig. 3, 3 a. Pfeiffer, Mon. Hel. VIII, p. 481. Bottger, Claus. Stud. 

 1876, p. 62. Kobelt, Faun. Japon. p. 81, t. VIII, f. 5—9 Gl. yocaha- 

 mensis, var. reiniana, Bottger, Claus. Stud. 1876, p. 62. Pfeiffer-Clessin, 

 Nomencl. Hel. p. 392. 



From what I have seen of the big Japanese Glausiliae I do not 

 believe that two species can be recognised. The characters by which 



