104 Records of the Indian Museum. [Vol,. XXIV, 



Parre.yssia tavoyensis (Gould). 



1843. Unio tavoyensis, Gould, Proc. Boston Soc. Nat. Hist. I, pp. 140, 



1856. Unio tavoyensis, Krister, in Martini and Chemnitz, Conch.-Cab., 



Unio, p. 166, pi. xlviii, fig". 2. 

 1862. Unio tavoyensis, Gould, Otia Conch, p. 190. 

 1864. Unio tavoyensis, Reeve, Conch. Icon. XVI, pi. xiii, fig. 49. 

 1866. Unio tavoyensis, Blanford, Journ. As. Soc. Bengal XXXV, p. 



148. 

 1868. Unio parma, Benson, Sowerby in Conch. Icon. XVI, pi. xclviii, 



fig- 514. 

 1870. Margaron (Unio) tavoyensis, Lea, Synonyms, p. 31. 



1876. Unio payma and U . tavoyensis, Hanloy and Theobald, op. cit., 



p. 61, pi. cliv, tig. 1 and p. 62, pi cliv, figs. 6, 7. 



1889. Unio parma, Tapparone-Canefri, op. cit., p. 239. 



1890. Unio parma, U. savoyensis and U. tavoyensis, Paetel, op. cit., 



pp. 164, 166, 169. 



1899. Unio tavoyensis, von Martens, op. cit., pp. 37, 38. 



1900. Paryeysia tavoyensis, Simpson, op. cit., p. 843. 



1914. Parreysia tavoyensis, Simpson, op. cit., pp. 11 14, 1115. 



1915. Parreysia tavoyensis, Preston, op. cit., pp. 167, 168. 



Unio parma Benson, was doubtfully included by Simpson 

 and Preston in the synonymy of this species ; having before me, 

 however, one of Benson's original specimens, probably a cotype 

 of the species, T am now able to confirm Simpson's conclusions. 

 Tapparone-Canefri's specimen from Bhamo, referred to in his 

 paper cited above as U. parma and another from Tenasserim 

 labelled Unio sp. also belong to this species. Simpson considered 

 Benson's Unio triembohis as a variety of P. tavoyensis, but an 

 examination of one of Benson's type-series of specimens shows 

 that U . triembohis is quite a distinct species. 



The umbones and a considerable part of the valves in the 

 young shells are covered with a beautiful zigzag sculpture ; this 

 however, becomes obsolete with age and hardly a trace of it is 

 left in full-grown individuals. 



P. tavoyensis is represented in the collection of the Indian 

 Museum by a large series of shells from Pegu, Tenasserim, Tavoy 

 and Arrakan. . 



Parreyssia feddeni (Theobald). 



1874. Unio feddeni, Theobald, Journ. As. Soc. Bengal XLII, pt. ii, 

 p. 208, pi. xvii, fig. 3. 



1877. Unio feddeni, Nevill, 'Journ. As. Soc. Bengal XLVI, pt. ii, p. 



38. 



1878. Unio feddeni, Nevill, op. cit., p. 900. 

 1900. Parreysia feddeni, Simpson, p. cit.. p. 165. 



1914. Parreysia feddeni, Simpson,/), cit., pp. 1113, 1114. 



1915. Parreysia (Parreysia) feddeni. Preston, op. cit., p. 165. 



This species was described by Theobald from shells collected 

 by Mr. F. Fedden and said to have been obtained from the Peem- 

 gunga River in Central India. Later Nevill, when reporting on 

 Dr. Anderson's Yunnan collections, stated that the species is tol- 

 erably abundant in the rice-fields at Pegu and also at Yaylay- 

 maw in Burma. He also doubted Central India as the proven- 

 ance of this species from the fact that in the ''carefully kept 



