of the Cyclostomacea in Hindostan. 415 



milium, nobis, a dwarf species from the warm southern valleys, 

 perhaps belongs to this type. Again traversing westerly the 

 Gangetic plain of Bengal, C. pyrotrema, nobis, appears among 

 the first rocks met with in the outlying portions of the Rajmahal 

 range, where the stream of the Ganges makes a bend to the 

 south ; and the genus proceeds along the ranges, with a southerly 

 tendency, towards the western side of the peninsula, skirting 

 the north bank of the Nerbudda, and is represented by a fine 

 new species, C. Pirrieanus, Pfr., in the Khoondah hills ; by C. 

 stenomphalum at Chyabasa in Singhboom ; and at Mandoo, west 

 of Indore, by a species not well ascertained, but which has been 

 attributed, erroneously, to C. Volvulus, Miill., although widely 

 differing from the Pulo Condore form. Traversing the river- 

 valleys of the Nerbudda and Tapty, we find C. Indicus, Desh., 

 inhabiting the warm region of the Concan (enclosed between 

 the sea and the high Western Ghauts) and the adjacent islets. 



A small species, from the description evidently new, and 

 probably attributable to this type, was found near the ridge of 

 these hills by Lieut. A. E. Benson, at the Caves of Karli, but 

 unfortunately was broken and the fragments thrown away. 

 This hint may assist in securing its detection when a concho- 

 logist may have an opportunity of visiting the spot. Still 

 farther south, on the summits of the range at Mahabuleshwar, 

 C. altivagus, nobis, adds another form to the genus; and at 

 the expanded southern termination of the ridge, the Nilgherries 

 present a rich series in C. Nilagiricus, Jerdoni, cceloconus, cuspi- 

 datus*, and ravidus, nobis, and Stenostoma, Sow., the two last 

 belonging, equally with the Darjiling C. Phcenotopicus, to the 

 planorbular type. It is to be remarked that Cyclophorus, after 

 obliquely crossing Central India, is confined to the high ridge 

 on the western side of the peninsula, and that no species has 

 yet been discovered on the eastern coast, nor in the intermediate 

 hills and plains, its place being partially supplied by other 

 genera of the Cyclostomacea. 



Alycceus, Gray. 



This is the most northerly and westerly genus of the Cyclo- 

 stomacea in Hindostan. Its head-quarters appear to be in the 

 Sikkim Himalaya, where Al. constrictus and AL Urnula, nobis, 

 inhabit Darjiling. To the north-west the genus is represented 

 by Al. strangulatus, Hutton, in the sub- Himalayan ridges of 



Fowlatt. An elegant variety has been sent from Chittagaon, in the north- 

 east angle of the Bay of Bengal, in which the peristome is of a beautiful 

 translucent yellowish-orange colour. 



* A specimen of C. cuspidatus with the operculum shows that it belongs 

 to Cyclophorus. Pfeiffer had placed it among the species incerta sedis. 



