AND OTHER FAMILIES. 213 



Remarks. — This species iias most resemblance in its general charac- 

 ters to the parvus (Barnes). It is, however, a larger shell, and in the 

 undulations of the beaks it is very different. Like the parvus, the sili- 

 quoideus, the cariosus and crassus, it is sometimes very much truncated 

 behind. In this state it might be mistaken for a different species, did 

 not, as in the abovementioued species, the other characters strictly iden- 

 tify it. 



Unio Blandingianus. Plate XV. fig. 44. 



Testd subtrapezoided, transversd, inxqiiilaterali, subinflalu ; valvulis teniiibus ; 

 natibus p7'ominiilis ; dentlbus cardinalibus compressis; lateralibus longis cur- 

 visque; margariid purpurea. 



Shell subtrapezoidal, transverse, inequilateral, somewhat inflated ; valves thin ; beaks 

 somewhat prominent; cardinal teeth coinjjressed ; lateral teeth long and curved ; nacre 

 purple. 



Hab. St John's river, ? Florida. Dr Blanding. 



My Cabinet. 



Cabinet of Dr Blanding. 



Diam. -9, Length 1-5, Breadth 2-3 inches. 



Shell subtrapezoidal, transverse, very inequilateral, somevv^hat in- 

 flated ; substance of the shell thin ; beaks somewhat prominent, 

 placed near to the anterior margin ; ligament rather long and narrow ; 

 epidermis fuscous, wrinkled ; cardinal teeth compressed, double in the 

 left valve and single in the right; lateral teeth long, curved and some- 

 what lamellar; anterior cicatrices distinct; posterior cicatrices conflu- 

 ent; dorsal cicatrices placed in the centre of the cavity of the beaks; 

 cavity of the shell rather deep; cavity of the beaks wide and shallow: 

 nacre dull purple. 



Remarks. — I owe to the kindness of Dr Blanding the specimens of 



this species which are in my cabinet. They were procured by this 



naturalist while in St Augustine, from an Indian whom he had directed 



to collect for him, and it is presumed they came from St John's river 



56 



