224 F. Stoliczka — Notes on Terrestrial Mollusca. [No. 3, 



an expanded outer peristome and by usually possessing a spacious 

 umbilicus. Albers places in the genus also II. Tuckeri, Pfi\, 

 fallaciosa, Pfr., ruginosa, Fer., and nilagirica, Pfr. Of these only the 

 first is probably referable to the genus, the others I would prefer 

 classifying in Planospira, considering nilagirica as the most aberrant 

 form. Mr. W. T. Blanford (Ann. Mag. N. H., 1863, 3rdser., vol. xi, 

 p. 85) added to the genus* H. delibrata, Bens., gabata, Gould, (= 

 Mcrguiensis, Pfr.), Belferi, Bens., vittataf Mill., proxima, Fer., and 

 crassicostata, Pfr. The three last named species have, I believe, again 

 to be referred to Planosptra, but the three others participate of the 

 generic characters of asperella and must, therefore, be considered 

 as belonging to Trachia. I could quote a few other species, as for 

 instance H. squalus, Hinds, JT. mendax, Martens, and others, but 

 they do not strictly speaking belong to the Indo-Burmese fauna. 



Planospira of Beck differs from Trachia by the solidity of the 

 shell, thickened inner lip, &c. Campylcea is, however, much more 

 closely allied to Trachia, both in form and structure of the shell ; 

 indeed there are strictly speaking no external characters to distin- 

 guish the two. But the former, with its type H. cingulata, is 

 said to possess a 4 — 6 ribbed jaw, and the genital organs have 

 numerous appendages, while in H. delibrata, (the only species of 

 Trachia of which I have examined the animal), the jaw has a great 

 number of ribs and the genital organs are of a very simple form. 

 Should, however, these characters prove to be of no avail for pur- 

 poses of classification, the two genera must be united into one, 

 and this is by no means improbable. 



The structure of the shell of Trachia also exhibits considerable 

 relation to some of the species of Dorcasia, and Fruticicola, the 

 latter apparently represented in India by the Helix similar is group. 

 I have examined some animals of this species from Penang, and 

 I find that the dentition agrees, but the jaw and genital organs 

 are different from those of Trachia ; the former being generally 

 costate, and the latter with a thick amatorial gland. 



It is difficult to predict in the present stage of our knowledge of 

 the animals what extent should be given to the genera Dorcasia • 



# Quoted by a misprint as ' Tachia* 



f 1 agree with Mr. Blanford that there is no need of proposing a new 

 genus for this species, as has been done by Albers. 



