Ortmann : Unionid/k of Western Pennsylvania. 193 



Recorded by Rhoads from the Ohio in Allegheny County. 



A dead specimen was found by the writer not far from Rhoads' 

 locality. It is found living in the Ohio in Beaver County, but is 

 very rare. 



19. Plagiola (Amygdalonajas) donaciformis (Lea). 



Only two specimens are recorded by Rhoads from the Ohio River 

 at Coraopolis, Allegheny County. They are in the Philadelphia 

 Academy, where the writer has seen them. They are both dead shells. 



This is the only one of the species previously reported, which has 

 not been found by the writer. 



20. Tritogonia tuberculata (Barnes). 



Not in Harn's, Stupakoff's, and Clapp's lists. Recorded by Rhoads 

 from the Ohio and Beaver Rivers. 



It occurred formerly in the Monongahela at Charleroi, Washington 

 County (Ehrmann Collection). The writer found several dead speci- 

 mans in Dunkard Creek, Greene County, and live ones in the Ohio in 

 Beaver County, and at various places in the Mahoning and Shenango 

 Rivers, and Pymatuning Creek in Lawrence and Mercer Counties. . 



According to Sterki (Nautilus, 21, 1907, p. 48) this species has all 

 four gills charged in the breeding season (June 10, 1907). This will 

 remove it, in our final arrangement, into the genus Quadnila^ 

 and then the name of the species must be changed, on account 

 of the existence of the species of Qiiadrnla named tuberculata 

 by Rafinesque. None of the synonyms is available : U. pustulata 

 Swainson (1840) being preoccupied by U. pustulatus Lea (1834), 

 and U. gigas (Swainson) Sowerby (1867) being not this species, but 

 equivalent \.o Hyriopsis cumingi (hea) (see: Frierson, Nautilus, 21, 

 1907, p. 49). Thus we are forced to apply a new name, and Quad- 

 rula tritogonia nom. nov. is proposed. (See Nautilus, 22, 1909, 



p. lOI.) 



2 1 . Cyprogenia irrorata ( Lea ) . 



Not mentioned in any of the previous lists, except in that of Rhoads, 

 who reports it from the Ohio, at Beaver. 



The present writer has found only dead shells in the Allegheny 

 River in the northeastern corner of Allegheny County, and in the 

 southern part of Armstrong County. 



22. Obliquaria reflexa Rafinesque. 



First indicated from Allegheny County by Clapp (C/. rornufus), 

 then by Rhoads from the Ohio River in Allegheny and Beaver Counties. 



