1919-] B. Prashad : The Anatomy of Indian Mollusca. 295 



nection between the anal and supra-anal is of about the same 

 size as the anal and the supra-anal also is not much larger. 

 The glochidia are semi-circular. 



Pseudodon (Pscudodon), Gould. 



Desha^^es and Julien* published a fairly good figure of the 

 animal of P. moreleti, Crosse and Fischer, but gave no description ; 

 the figure also, owing to its being drawn from the lower surface, 

 does not show some important details. Simpson from this figure 

 described {loc. cit., p. 834) the animal as follows-. '' Animal having 

 the branchiae wide and rounded behind, becoming narrow in 

 front ; palpi enormously long, apparently slender, pointed behind 

 where they project free for some distance, mantle thin with 

 slightly thickened border, faintly papillose behind, there seeming 

 to be but little distinction between anal and branchial openings ; 

 anal opening apparentlj' smooth." Unfortunately no more in- 



O.G. 



y>Br. 



Text-fig. 6. — Animal of Pseudodon salveiiianus, reference lettering same as 

 in fig. I. 



formation can be got from Deshayes and Julien's figure and such im- 

 portant points as the presence or absence of a supra-anal, the 

 mantle connection between the anal and supra-anal and even the 

 distinction between the anal and branchial apertures cannot be 

 made out. Simpson placed P. moreleH in the section Pseudodon^ 

 but the animal of P. salvenianus described below differs materially 

 from that of the other known species of this section, and as P. 

 salvenianus is the t^^pe-species of the section Pseudodon, it seems 

 that the whole grouping requires revision. 



In Simpson's classification the genus is included amongst the 

 Endobranchiae, but the marsupium in P. salvenianus, at any rate 

 is formed by all the four gills and hence it should be included 

 amongst the Exobranchiae, Homogenae. In Ortmann's classifica- 

 tion it will be included in the family Unionidae and the sub-family 

 Unioninae. 



1 Nouv. Arch, dii Afiis., X, pi. v, fig. 3 (1874). 



