I094 psEunoDON 



Pseudodon salivenianum Hanlky and Theobald, Conch. Ind., 



1876, p. 5, pi. IX, fig. 4. 

 Pseudodon sahvenianus Simpson, Syn., 1900, p. 838. 



Sowerby and Hanley and Theobald figure what they beHeve 

 is the above species, but the measurements given by Gould are 

 for a shell much longer in proportion to its height than theirs. 

 The species would seem- to be easily distinguishable by its 

 considerable length, and the strong posterior plication. I am 

 doubtful whether the figures in the Conchologia Indica and 

 the Conchologia Iconica really are taken from Gould's shell. 



Pseudodon moreleti Crosse and P'ischer. 



vShell large, subrhomboid, subinflated, rather solid, inequi- 

 lateral ; beaks full, wide, moderately prominent ; posterior 

 ridge full, widely rounded, with one or two small, distinct 

 ridges above ; anterior end a little narrowed, rounded ; base 

 lightly curved or straight ; posterior end obliquely subtruncate 

 above, rounded below ; surface with irregular growth lines ; 

 epidermis dark brown, somewhat shining, roughened on the 

 border of the shell and behind ; teeth single in each valve, not 

 large, smooth and subcompressed ; dorsal scars forming a row 

 under the beaks ; anterior scars impressed ; posterior scars 

 large, semicircular, shallow ; nacre pale purplish, iridescent 

 behind. 



Length 124, height 80, diam. 48 mm. 



Cambodia. 

 Monocondylcca ttimida Deshayes and Juixien, Nouv. Arch. 



de Mus., 1874, p. 117, pi. V, figs. 1-3. 

 Pseudodon moreleti Crosse and Fischer, Jl. de Conch., XXV, 



1876, p. 330. — Simpson, Syn., 1900, p. 838. 



A magnificant specimen of this species with the above 

 measurements is in the National Museum Collection from 

 Cambodia. It is the largest Pseudodon I have seen. The form 

 is slightly obovate, inclining to rhomboid ; the nacre is pale 

 purple and differs in color from that of any species I am ac- 

 quainted with. Deshayes and Jullien figured both shell and 

 animal of this species beautifully in the Nouvelles Archives du 



