54 LAND AND FKESIIWATER 



Original description : — " T. magni/lca, fragilis, ve^itricosa, epider- 

 mide rigida fuscescente induta, obsolete spiraliter- striata ; anfr. 3 + • 

 Apertura ampla, suhcircidaris, ad columellam vix incrassata. Axis |, 

 diam. l|poll. (Plate LXXII. fig. 1.) 



" Inhabits Hongkong in ravines near summits of hills. 



" By far the largest species yet described ; approximates closely 

 to H. aynjjulla, Bs." 



Tryon (in Man. Conch. 2nd ser. vol. i. 1885) says: "the largest 

 species of the genus." Perhaps belongs to same group as FT. prcestans, 

 Gould. Westerlund has described, but not figured, a var. imperatriv. 



And the following probably belong to the same genus : — 



H. coch'bicJiinensis, Morelet. 



H. hinnanicus, Phil. Diam. 9-3 mm. 



//. sumatrensis, Schepman. Diam. 7*5 mm. 



It may be said with truth that the area embraced by the countries 

 enumerated on the titlepage of this work is large enough to attack 

 already without overstepping its bounds ; but in a generic sense I 

 find it impossible to keep within its limits and, so far as I can 

 attempt it, to give at the same time a clear elucidation of certain 

 genera that are found within it and define the exact limits of their 

 range. For example, there still seems to exist in the minds of 

 some naturalists an idea that the genus Girasia and its allies 

 are not separable from Parmarion and its allied forms. I shall 

 therefore introduce into this Part descriptions and drawings of 

 the genera Damayantia, Parmarion, and Microparmarion, to show 

 the marked difierences that exist between the slug-like forms of 

 India and Bu^rmah and those that have been found on the islands 

 of the Malay Archipelago. 



In an excellent paper by Dr. Heinrich Simroth on a new Parma- 

 rion genus, published in the work ' Zool. Ergebnisse einer Reise in 

 NiederlJindisch Ost-Indien' (1893), he seems unwilling to acknow- 

 ledge the priority of Gray's Girasia over Fischer's Parmarion, which, 

 after all, was only by a few weeks. I was guided in my adoption 

 of Gray's genus not on this account so much as by the fact of 

 finding the true type of G. hoolceri in the British Museum, while the 

 exact type of Parmarion was doubtful, and was not likely to be 

 discovered with, the same certainty as to habitat; in the case of 

 Girasia its collector, Sir Joseph Hooker, was recorded. Still I did 

 not lose sight of an important point which was known, viz. that 

 the habitat of Parmarion, whatever the species might be, was 

 restricted to Java. 



The above valuable paper, and my own work among the Indian 

 slugs, shows very clearly now that both these subgenera of the 

 Helicarioninaj can be retained, and inhabit very well-marked areas, 

 and it is happily quite immaterial when and by whom the generic 

 terms were created. In the several details of their anatomy they 



