136 Contributions to Indian Malacology. [No. 2, 



Gleanings in Science, Vol. I., Calcutta, 1829. 



Kuster, Mart, and Chem. — Systematisches Conchylien Cabinet von 

 Martini und Chemnitz, 2nd edition, by Dr. H. C. Kiister and others. 

 Vol. IX. Part 2, commencing in 1843 : unfinished. 



Ann. and Mag. Nat. Hist. — The Annals and Magazine of Natural 

 History, London, 3rd series, Vol. X. 1862. 



Trans. Am. Phil. Soc. — Transactions of the American Philosophi- 

 cal Society held at Philadelphia, new series, Vol. IV. 1834 ; Vol. V. 

 1837 ; Vol. VI. 1839 ; Vol. VIII. 1843. 



Jour. Acad. Nat. Sci. Phil. — Journal of the Academy of Natural 

 Sciences of Philadelphia, Vol. IV. 1858-60 ; Vol. V 1862-63. 



J. A. S. B. — Journal of the Asiatic Society of Bengal, Vol. III. 

 1834 ; Vol. IV. 1835 ; Vol. V. 1836. 



Proc. Post. Soc. Nat. Hist. — Proceedings of the Boston Society of 

 Natural History, Vol. I. 1843-44, (not accessible in Calcutta). 



Gould, Ot. Conch. — Augustus A. Gould, Otia Conchologica, de- 

 scriptions of shells and mollusks from 1839 to 1862, Boston, 1862. 



S. Hanley, Supp. to Wood's Ind. Test. — Supplement to Wood's 

 Index testaceologicus, 1855 (not accessible in Calcutta). 



Genus UNIO, Retzius. 



I. — India. 



No. 1. — Unio Corrugatus, Mull. sp. Rivers of Coromandel. 



Mya corrugata, Mull., p. 214, No. 398. 



Unio corrugata, [a.] Lam., VI., 78, No. 34. 



"U. corrugatus, Kuster, Mart, and Chem., p. 289, pi. 97, figs. 3, 4. 



There is the greatest conceivable confusion about this species and 

 the next one, and it is far from clear what Midler's type was. I 

 cannot obtain access to his work in Calcutta, but Kuster copies the 

 description thus : — 



Testa rhombea, viridescens, tenera, pellucida ; (umbonibus corruga- 

 tis ;) valvulm intus siriis radiantibus subtilissimis notantur. 



The figures are, I suppose, those of Chemnitz's types ; they are 

 two in number, one representing the exterior of a subequilateral, nearly 

 elliptical shell, measuring 36 mm. by 24 in its two diameters, and the 

 other the interior of a far more inequilateral shell, also subelliptical, 

 rather smaller than the first, and having every appearance of being a 



3 



