370 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XIV. 



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



Fig. 1. Obovaria {Obovaria) subrotunda (Rafinesque). Probably male according 

 to shape, diameter 68 percent of length, from the Monongahela River, Charleroi, Wash- 

 ington Co., Pennsylvania, collected by G. A. Ehrmann; C. M. Cat. No. 6L2840. 



Fig. 2. Obovaria {Obovaria) subrotunda (Rafinesque). Probably a female, judging 

 from the shape; diameter 62 percent of length, from the Monongahela River, Charleroi, 

 Washington Co., Pennsylvania, collected by G. A. Ehrmann; C. M. Cat. No. 6L2840. 



Fig. 3. Obovaria {Obovaria) subrotunda levigata (Rafinesque). Male, diameter 50 

 percent of length, from the Shenango River, Clarksville, Mercer Co.^ Pennsylvania 

 collected September 21, 1908; C. M. Cat. No. 61.3558. 



Fig. 4. Obovaria {Obovaria) subrotunda levigata (Rafinesque). Female, diameter 

 52 percent of length, from the Shenango River, Clarksville, Mercer Co., Pennsylvania, 

 collected September 21, 1908; C. M. Cat. No. 61.3558. 



Fig. 5. Actinonaias ligamcntina (Lamarck). Male of medium size from the 

 Allegheny River, Kelly, Armstrong Co., Pennsylvania, collected October 4, 1907; C. M. 

 Cat. No. 61.3108. 



Fig. 6. Actinonaias ligamentina (Lamarck). Gravid female of medium size from 

 the Allegheny River, Kelly, Armstrong Co., Pennsylvania, collected October 4, 1907; 

 C. M. Cat. No. 61.3108. 



Fig. 7. Amygdalonaias truncata (Rafinesque). Male from the Ohio River, In- 

 dustry, Beaver Co., Pennsylvania, collected September 8, 1908; C. M. Cat. No. 61.3569. 



Fig. 8. Amygdalonaias donaciforrnis (Lea). Male from the Missouri River, St. 

 Joseph, Buchanan Co., Missouri, collected by W. I. Utterback, November 1, 1913; 

 C. M. Cat. No. 61.6887. 



Fig. 9. Amygdalonaias donaciforrnis (Lea). Female from the Missouri River, 

 St. Joseph, Buchanan Co., Missouri, collected by W. I. Utterback, November 1, 1913; 

 C. M. Cat. No. 61.6887. 



Fig. 10. Plagiola lineolata (Rafinesque). Adult male from the Ohio River, Cook's 

 Ferry, Beaver Co., Pennsylvania, collected September 12, 1908; C. M. Cat. No. 61.3565. 



