KHASI HILLS. 179 



peculiar ciimatal conditions which occur in the district under consi- 

 deration, are amply sufficient to have produced, during the lapse of 

 ages, those peculiar and striking gorges which we have described. 

 And certainly few grander instances of the force and amount of fresh- 

 water denudation could be quoted. 



FOSSILS. 



Note. — The unfortunate loss of the collection of fossils made by me during my visit 

 to the Khasi Hills, when on its way to England for examination, has prevented my 

 adding much to our paljeontological knowledge concerning these rocks. In the valuable 

 work of Messrs. D'Archiao and Haime, on the fossils of the Nummulitic group of 

 India, sixteen species are given as occurring in Eastern Bengal. Of these, one rhizo- 

 pode {Alveolina oi-oic^ea^ is identified; six species of Nummulites, (N. Scahra; oblusa; 

 Lueasana; Beaumonti ; exponens ; spira), and a single species in each of the 

 following genera, but in all cases indeterminate ; — Cardium, Modiola, Pecten, Ostrea, 

 Terebratula, Melania, Pileolus, Trochus, Cerithium. To this limited number I can 

 add, fi'om a few poorly preserved duplicates which remained of my collection : 



Nummvlites perforata ; N. Icevigata ? ; iV. Li/elli ? ; N. 2 species undetermined ; — 

 Echinolampas 1 species; — Pecten corneus ? ; P. Boueil — P. species undet.; Kerita 

 Schmideliana ? Ovula depressa. 



Some future opportunity may occur of replacing the lost collection, and it will then 

 be found that the fauna of the Nummulitic group in Eastern Bengal is nearly as rich 

 in species as that of well known localities in Western India. 



