66 0. F. V. Mollendorff — Japanese Land and Freshwater Shells. [No. 1, 



(8) Subgroup of CI. hyperolia, v. Mart. 



Of this subgroup, I described in my former paj^er two new species, 

 CI. rectahina and CI. ajptychia, but having since received more material 

 for study from Messrs. Eastlake, Sclimacker, and Anderson I am now 

 convinced that they have to be reduced to varieties, or, perhaps, even 

 mere forms, of CI. hyperoUa. I was led into this error by the scanty 

 supply of specimens ; and this is a characteristic instance of the difficulty, 

 if not impossibility, of getting a correct idea of a species of Clausilia, 

 especially in the Asiatic groups, from single individuals. CI. hyperoUa 

 seems to be very variable in size, shape, etc., but none of the distinguish- 

 ing characters of the various local forms seems to be of specific value. 

 I now propose to distinguish the following varieties. 



32. Clausilia htperolia, v. Mart., type, 17-20 mill, in length. Near 

 Tokio (Hilgendorf, Rein, SchmacJcer), hills on the way to Nikko and 

 Kavasaki (Eastlahe). 



Var. REETALUNA, V. Molldff., somewhat more slender, of pale horny 

 colour, with a rudimentary principal plait ; the other characters given 

 (1. c. p. 9) are not constant, inasmuch as the spiral bands or lines are 

 often deficient in the type itself, whilst the lamella infera often termi- 

 nates in the same way as described in CI. rectaluna. 



Kamatokogiro (Hungerford) . 



Var. APTTCHIA, V. Molldff., larger, up to 25 mill, long, upper parietal 

 lamella somewhat smaller, lower lamella a little more visible in the 

 aperture, the lunella sometimes, but not always, evanescent. 



Dr. Anderson collected this form in some numbers at Hakoni and 

 Chusinji, the former place being the original habitat. It is very 

 variable in size and somewhat also in shape, form of the aperture, and 

 thickness of the peristome. 



Var. PLANULATA, V. MolL, differt a typo testa longiore, multo gracilliore, 

 anfractihus planulatis, lamella superd humili, inferd magis recedente, 

 antice inconspicud. 



Two specimens from Kobi (Eastlahe). Of all the forms, this 

 has perhaps the best claim to specific distinction, and, if the characters as 

 given above prove constant in a greater number of example's, it had 

 better be separated, especially as the locality is widely distant from those 

 of the other varieties. 



33. SucciNEA LAUTA, Gould. Hakodadi, Oginohama, Poronai, 

 Chitose, all on the island of Yeso, where the species had been previouslv 

 found. ^ -^ 



34. LiMNJius JAPONicus, Jay. Lake Chusinji, Yeso. 



35. LiMNJius PERVius, V. Mart. Central Japan. 



36. Altcjius nipponensis, Reinh. Yeddo {Bdnitz, migendorf), 

 Nikko and Hakoni mountains (Eastlake), and Mianoshda (Anderson). 



