368 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XIII. 



All figures are three-fourths natural size, a, lateral view; h, dorsal view. 



Fig. 1. Ellipsaria fasciolaris (Rafinesque). Gravid female from the Mahoning 

 River, Mahoningtown, Lawrence Co., Pennsylvania, collected August 4, 1908; C. M. 

 Cat. No. 6L3589. 



Fig. 2. Ellipsaria fasciolaris (Rafinesque). Inside of female shell, showing the 

 marsupial depressions, from the Shenango River, Pulaski, Lawrence Co., Pennsylvania, 

 collected July 19, 1909; C. M. Cat. No. 61.4128. 



Fig. 3. Ellipsaria fasciolaris (Rafinesque). Form of Lake Erie, female, from Lake 

 Erie, Presque Isle Bay, Erie, Erie Co., Pennsylvania, collected July 12, 1910; C. M. Cat. 

 No. 61.4748. 



Fig. 4. Obliquaria reflexa Rafinesque. Male, largest found in Pennsylvania, from 

 the Ohio River, Industry, Beaver Co., Pennsylvania, collected October 5, 1909; C. M. 

 Cat. No. 61.4423. 



Fig. 5. Cyprogenia stegaria (Rafinesque). Largest specimen found in Pennsylvania 

 in the Allegheny River, Godfrey, Armstrong Co., Pennsylvania, collected July 27, 1910; 

 C. M. Cat. No. 61.4760. 



Fig. 6. Ohovaria (Obovaria) retusa (Lamarck). The only male (dead shell) found 

 in Pennsylvania in the Ohio River, Industry, Beaver Co., Pennsylvania, collected 

 October 22, 1908; C. M. Cat. No. 61.3556. 



Fig. 7. Obovaria (Obovaria) retusa (Lamarck). Gravid female, the only living 

 specimen found in Pennsylvania, in the Ohio River, Industry, Beaver Co., Pennsylvania, 

 collected August 29, 1908; C. M. Cat. No. 61.3555. 



Fig. 8. Obovaria (Pseudoon) olivaria (Rafinesque). Male from the Ohio River, 

 Portland, Meigs Co., Ohio, collected September 22, 1910; C. M. Cat. No. 61.4776. 



Fig. 9. Obovaria (Pseudoon) olivaria (Rafinesque). Female from the Ohio River, 

 Industry, Beaver Co., Pennsylvania, collected August 29, 1908; C. M. Cat. No. 61.3561. 



