1885.] 0. F. V. MolloiidorfE — Jaimnese Land and Freshwater Shells. G3 



tliey are to be distinguished vary a good deal even at the same locality, 

 especially the more or less visible subcolumellar lamella. If Kobelt's 

 identification of his 01. reiniana with Gl. martense, Herklots, is correct, 

 as I think it is, then CI. yocohamensis, Crosse, will have to follow suit. 

 Perhaps varieties may be distingnished, but for this purpose the habitats 

 of the different forms will have to be more exactly recorded than they 

 have hitherto been. 



Dr. Anderson obtained one dead specimen of a Megaloplmedusa at 

 Mianoshda ; if the two species are to be separated, this would be Gl. 

 yocohamensis, Crosse. 



21. Clausilia ducalis, Kobelt. A single specimen from Hakoni, 

 where Mr. R. Hungerford collected the same species before. 



Group Gylindrojphaedusa, Bottg. 



My friend Dr. Bottger does not quite agree with me in classing Gl. 

 gracilispira, mihi (1. c. p. 5, t. I, f. 5), with the Himalayan Gl. cylindrica, 

 Gray, and would rather propose to insert it in the group of Gl. validius- 

 cula, Mart. (Heniiphaed^isa subgroup 1.). The species does not seem 

 to agree perfectly with either of the two groups, but the shape of the 

 shell and of the lower parietal lamella are certainly nearer those of 

 Gl. cylindrica. Another question is, whether Gylindrophaedusa can be 

 upheld as a separate subsection at all. The investigation of Western 

 and Central China will probably enable us to decide these questions. 



Glausilia micropeas, mihi, is certainly no Gylindrophaedusa, as I shall 

 show further on. 



Group Hemiphaedusa, Bottg. 

 (a) Subgroup of Gl. validiuscula, v. Mart. 



As mentioned above Gl. tetraptyx, mihi, is to be removed from this 

 subgroup. 



(/5) Subgroup of Gl. suhlunellata, MoUdfF. 



The following species form a subgroup of their own within the 

 section Hemiphaedusa, to which they undoubtedly belong on account of 

 their very receding, almost straight, lower parietal lamella and their 

 narrow clausilium. The first subgroup, that of Gl. validiuscula, shows, 

 instead of a lunella, a number of lateral palatal plaits, whilst the following 

 subgroups have a more or less straight lunella and no ' palatales ' except 

 the principal one. 



The following species, however, have below the principal plait, first 

 an upper palatal, after this a very short second one, and then a short 

 straight lunella, which in some forms is somewhat obsolete, but always 

 discernible. We have, therefore, in these forms, a remarkable transitional 

 group between that of Gl. validiuscula and the other Hemiphaedusae. 



