390 FAUNA ANTIQUA SIVALEJSTSIS. 



Eemaeks on the List. 



The total number of fossil species belonging to fresbwater 

 genera is 15. 



Tbe total number of recent species brought from the same 

 country is 15. 



Four of the fossils are identical with recent species. 



The remainder are probably extinct forms. They consist 

 of:— 



1st. A Paludina, which, though extremely near P. Be7i- 

 galensis, must be regarded rather as its representative than 

 its homologue. 



2nd. A Melania which is very distinct from any Indian 

 form I can find a record of, and which appears to have taken 

 the place of the existing Melania thiarella. I have seen 10 

 Indian Melanice ; it is none of them. 



3rd. Of a series of JJniones which are different from any spe- 

 cies of which I can find a record. In 1838 Mr. Lea enumerated 

 13 species as the total number of known Asiatic JJniones. 

 Of the 10 Sewalik fossil species, 1 only is identical with any 

 of these 13 species, so that 9 remain to be accounted for. 

 The common Vnio of India appears to be Z7. marginalis of 

 Lamarck, which is not to be found among these fossUs. 



Of the species found fossil which are identical with recent 

 forms, the only JJnio appears to be identical with one of the 

 commonest existing species of India. The Paludina is the 

 P. unicolor which is found among the shells of the Paris basin, 

 and also in the mammUliferous crag of England. At present 

 this species ranges from Egypt to India. The AmpuUaria is 

 remarkable for bearing a more close resemblance to the 

 individuals of the species from the Jumna than to those 

 existing at present in the Sewalik district. 



Besides these fossil freshwater shells there is a species of 

 Pupa or Bulimus with which I am unacquainted. 



On the whole I am inclined to regard the evidence of the 

 Sewalik Molluscan fauna as indicative of the older Pliocene 

 period — at latest, 



E. Forbes. 



