Mr. W. H. Benson on new species of Cyclostoma. 193 



inquirers have hitherto abruptly terminated. At one spot, near 

 this border, a goodly-sized Cyclophorus, possibly the small variety 

 of C. stenomphalum, Pfr., appears at Bhamoury, a few feet above 

 the point where the Lower Himalaya springs from the forest of 

 the Terai. Proceeding along the Himalaya, to the east of Nipal, 

 Darjiling, in Sikkim, furnishes C. Himalayanumt Pfr. MSS., 

 Aurora, constriction, Phcenotopicum, and funiculatum, nobis, and 

 the country of Bhotan C. pauper culum, Sow., a species nearly 

 allied to the last. Crossing the Burhampooter river, the hills 

 to the south of Assam present us with C. zebrinum, Pearsoni, and 

 sarritum, nobis, also with Pterocyclos hispidus, and parvus, 

 Pearson. 



Singular as it may appear, the whole of the extensive tract of 

 Gangetic plains stretching from the Desert west of the Jumna to 

 the seaboard of the Delta, in Bengal, fails to furnish a single 

 species, except where the rocks of the mountain-ranges south of 

 the Ganges impinge on the stream below Patna in Bahar. At 

 these places C. Involvulus, Mull., and Pterocyclos rupestris, nobis, 

 make their appearance, but they seem to be interrupted towards 

 the west by the sandstone formation of the Vindhyan chain. 

 Still further west, and north of the Nerbudda river, C. semi- 

 striatum, Sow., appears at Neemuch, in lat. 25° N., and extends 

 to the south as far as Poonah, which lies south-east of Bombay. 

 On the eastern side its place is taken, in the Northern Circars 

 of Madras, by C. aratum, nobis, where according to Jerdon this 

 species is accompanied by Pterocyclos rupestris. 



Near Bombay again, at Elephanta, C. Indicum, Desh., and 

 C. stenomphalum, Pfr. (the large var.) are found, the former ex- 

 tending to the Nilgherries, where C. Jerdoni and cceloconus, 

 nobis, stenostoma, Sow., Trochlea, ravidum, cuspidatum and^z/o- 

 cinctum, nobis, also C. nitidum, Sow. (on the authority of Pfeiffer 

 and Mr. Cuming's collection), add materially to the list, while at 

 their eastern base the singular Pterocyclos bilabiatus, Sowerby, 

 occurs. 



Descending southward to the rich island of Ceylon, we find 

 C. Menheanum, Phil., Ceylanicum, Pfr. (if distinct from the true 

 Indicum), C. annulatum, Trosch., halophilum, nobis, helicinum, Ch., 

 Itieri, Guerin (cornu venatorium, Ch.?), and Ho ffmeisteri, Trosch., 

 of which the specimens found by myself at Galle, and agreeing 

 apparently with TroschePs short description, cannot be con- 

 founded with Kuster's figure of the species previously named. 

 To the same island belong also the magnificent Pterocyclos Cu- 

 mingi, Pfr., recently published*, and a fine species captured by 

 Dr. Bland at Trincomalee. 



* In the 1st No. of the ' Zeitschrift ' for 1851, Pfeiffer publishes a review 

 of Pterocyclos as at present known, following the synonymy given in my 

 Ann. $ Mag. N. Hist. Ser. 2. Vol. viii. 13 



