358 Description of two new Species of [June, 



the confluence of the shelly matter. The impending wing also shews 

 a greater tendency to a retroverted and tabular form. 



It is probable that Sowerby's Cyclostoma bilabiatum, from Salem 

 in the Madras presidency, will form a fourth species of Pterocyclos, 

 distinguished by the sinuated addition at the back of the true lip. 

 When I examined it in London, I thought that it was identical with 

 P. rupestris, and that my specimens of the latter had not attained 

 their full growth ; a further search in the locality of the species, and 

 the consideration that the sinuated lip must have been of previous 

 formation to the reflected circular aperture, have contributed to alter 

 my opinion on the subject. 



Cyclostoma saturate has the aspect of an immature Pterocyclos. Its 

 habitat is, I believe, Demarara. 



I had prepai'ed the whole of my notes on the collection both of 

 land and fresh- water shells during a period of leisure previously to the 

 close of last year, bat I have since then been prevented by want of 

 time from correcting and arranging them. Dr. Pearson's hint, in 

 his report on the Museum, has called forth this first brochure, consist- 

 ing of the land-shells, I fear in rather an unfinished state, for which 

 I trust that circumstances will prove an apology. The fresh-water 

 shells shall follow at the earliest practicable period. 



V. — Description of two new species belonging to a new form of the 

 Meruline Group of Birds, with indication of their generic character. 

 By B. H. Hodgson, Esq. Resident in Nepdl 



These birds have the wings, tail, and feet of Turdus ; and if we conti- 

 nue the comparison from the external to the internal characters, we find 

 a similar construction of the tongue, stomach, and intestines in both. 



Both, too, have a similar regimen, habits, and manners. Yet they 

 are strikingly contradistinguished by the respective forms of the 

 bill. In the thrushes that member is compressed, and has its arched 

 maxilla freely exserted from the frontal feathers, and very little cut out 

 by the nasal fossae. In the birds now in question, on the contrary, 

 the bill is so much depressed as to be more than twice as broad as 

 high at the base ; and its straight maxilla, greatly incumbered by the 

 frontal plumes, has the nasal fosse so far produced to the front as to 

 pass the centre of length of the bill. 



In the birds before us, too, the head is furnished with a garruline 

 crest ; which is never observed in Turdus. The tarsi are lower than 

 in the generality of thrushes ; and the tail is somewhat longer and less 

 even at the end. Like most of the Nipalese thrushes, these birds are 

 common to all the three regions of the kingdom. They are shy in 



