152 Contributions to Indian Malacology, [No. 2, 



Vonderibuschiana,) and also in both Adams's figures of different species 

 of Monocondylcea from S. Am erica. The same occurs in Anodon and 

 in the type species of Margaritana of Schumacher,* (if. margaritifera, 

 L.). I have not had an opportunity of examining the animals of the 

 Burmese species of Monocondylcea ^ and therefore cannot say if the 

 gills are free or not. 



Besides the above forms, a minute species of Anodon is stated by 

 Mr. Benson to inhabit ponds in Bundelcund, J. A. S. B., V. 750. 



P. S. No. 2a. — Unio spurius, Gm. Tranquebar. 



Mya spuria, Gm, vol. I, Pt. VI, p. 3222, No. 16. 



Unio spuria, Lam. VI, 80, No. 45. 



Mya spuria, Wood, Ind. Test. p. 12, pi. 2, No. 35. 



Since writing the note on this species at p. 146, T have found that it 

 was described originally as from India. GTmelin refers to Schroeter 

 Einl. in Conch. II, 617, No. 9, pi. 7, f. 5, so perhaps the name may 

 have been given by Schroeter, though that by no means follows from, 

 the reference. The description is very brief : " M. testa rhombed I'viridi, 

 nations glabris" and the shell is said to be like corrugatus, but near- 

 ly twice the size and perfectly smooth in front of the beaks ( u praeter 

 vulvae regionem tota glabra" Grm. 1. c). Wood's figures are all poor. 

 The shell can scarcely be a young form I think, if considerably larger 

 than corrugatus. 



Mya radiata,f I find, is attributed to Malabar by Gmelin, (p. 3220,) 

 from whom Wood appears to have only copied his localities. The species 

 is, I think, correctly attributed to Chemnitz by Mr. Benson, although 

 other authors give G-melin as their authority. Gmelin's description 

 runs thus — " M. testa ceguivalvi pellucida tenuissime transversim stri- 

 ata viridi flavicante livido radiata ; valvis altero latere latissimis, alterp 

 angustissimis ." I know of no form of Indian Unio to which this de- 

 scription would be applicable, and I cannot help suspecting that the 

 writers who have applied the name to an American species may very 

 possibly be right. Wood's figure, also, does not recall any Indian 



* It is by no means clear that Margaritana and Monocondylcea are more than 

 subgenera, or even artificial sections of Anodonta. M. Vondenbuschiana is inter- 

 mediate between the second and last in characters of the shell, and there is no 

 known essential distinction in the animal. 



f The Linnaean genus Mya, like most Linnsean genera, was an artificial group 

 to some extent Besides Mya as now understood, it comprised Unio and seve- 

 ral other genera. 



