1832.] Account of a new Genus of Land Snails. 13 



Sikrigali and at Rajmahal. It is highly probable, that Pterocyclos will 

 be found on the neighbouring outlying rocks of Pirpointi, on the ridge 

 between Patharghata and Kasita, on the isolated hill in the neighbour- 

 hood of an Indigo-planter's house, between Kasita and Kalgaon ; and 

 on a similar hill, at the back of the latter place, as well as on any part 

 of the neighbouring main range of Rajmahal. It wou!d be worth a 



conchologist's while, who may have an opportunity of visiting these 

 rocks in showery weather, or shortly after a fall of rain, to seek for spe- 

 cimens of the shell for the purpose of inspecting the animal. I regretted, 

 that I had no time to spare for a careful search at either of the places 

 cited as localities of the species. Those which I found were with se- 

 veral specimens of a Cyclostoma, a reversed Carocolla and Macrochla- 

 mys*, collected in the space of a few minutes, and in a hurried search. 

 The best method of collecting is to take several servants up the rocks, 

 and after shewing them what objects are required, to employ them in 

 turning over the fallen leaves, and in inspecting the loose rubbish in the 

 crevices of rocks. 



The species, which appears to be confined to rocky hills, I shall 

 name P. rupestris. Its specific character is subjoined. It is probable, 

 that some of the less material characters, which I have added to the 

 generic character, in order to make the description as perfect as possi- 

 ble, will be required to be added to the specific character of P. rupes- 

 tris, when other species shall be discovered, in consequence of their not 

 being found to be common to all. 



P. rupestris. Testa longitudinaliter confertim striata, albida, sub- 

 diaphana, lineis longitudinalibus castaneis supra et infra picta ; versus 

 apicem piscescens, anfracte ultimo fascia media castanea ornato. 



Var. 1. Fascia media omissa. 



Var. 2. Lineis angulatis subtus omissis. 



Var. 3. Testa tota cornea. 



Shell sub-diaphanous, whitish, closely striated across the whorls, 

 marked above and below with angular chesnut lines running across 

 the whorls, and with a band of the same colour on the centre of the 

 last whorl, purplish-brown towards the apex. 



Var. 1. The same without the medial line. 



Var. 2. Ditto without the angular markings underneath. 



Var. 3. The whole shell horn-coloured. 



The medial band in the type specimen, and in the second variety, 

 appears to be composed of arrow-shaped spots, and is only a more pro- 

 nounced expression of the angular lines. 



* A new genus of the Helicidae, separated by me from Helix, in consequence of 

 the wide departure of the animal from the type of that genus. 



