PSFiLTDOnON 1089 



PsEUDouoN cuMiNGii (Lea). 



Shell irregularly subrhomboid, convex, scarcely subsolid, in- 

 equilateral : beaks not prominent ; posterior ridge rather full, 

 rounded or imperfectly double, ending in a blunt point or a 

 feeble biangulation near the base ; anterior end somewhat nar- 

 rowed, rounded ; dorsal line curved ; dorsal slope obliquely 

 subtruncate ; base curved, fullest about at the middle ; surface 

 with irregular growth lines ; epidermis brownish to blackish, 

 smooth and shining, though slightly smoky ; teeth single in 

 each valve, subcompressed, smooth ; dorsal scars deep ; muscle 

 scars well marked ; nacre bluish or purplish, sometimes brown 

 tinted. 



Length 85, height 53, diam. 26 mm. 



Malacca ; Perak ; Siam ; Cambodia. 

 Anodonta cmmngii Le.-^, Pr. Zool. Soc. Loud., 1850, p. 199. — 



MusGROVE, Phot. Conch., 1863, pi. i, fig. 6. 

 Magaron (MonocondyUva) ctimingii Le.\, Syn., 1852, p. 50, 



1870, p. 73. 

 Monocondykca cnmiiigii Lea, Jl. Ac. N. Sci. Phila., IV, i860. 



p. 235, pi- XXXIII, fig. 114; Obs., Vn, i860, p. 53, pi. xxxiii, 



fig. 114. 

 Anodon cumingii Reeve, Conch. Icon.,X\'IL 1870, pi. xxxi, 



fig. 122. 

 Microcondykca cumingii Clessin, Conch. Cab. .\no., 1876, p. 



259, pi. Exxxiii, figs. 3, 4. 

 Pseudodiis cumingii de Morgan, Bull. Soc. Zool. de Fr., X, 



1885, p. 422. 

 Fseudodon cumingii SniPSON, Syn., 1900. p. 837. 



Very close to F. %'ondcinbuschianus, but darker colored, 

 rather more solid and inflated and having a higher posterior 

 ridge. It is quite probable that a large series from dififerent 

 localities would show that the two intergraded. 



PsEUDODON .ENEOLUS Drouct. 



vShell elliptic rhomboid, subcompressed. subsolid, inequilat- 

 eral ; beaks low and subcompressed ; dorsal outline lightly 

 curved, ending in a low wing behind ; dorsal slope subtrun- 



