380 MEMOIRS OF THE CARNEGIE MSEUUM. 



EXPLANATION OF PLATE XIX. 



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



Fig. 1. Lampsilis ovata ventricosa (Barnes). Quite normal gravid female from 

 French Creek, Cambridge Springs, Crawford Co., Pennsylvania, collected September 

 13, 1909; C. M. Cat. No. 61.3996. 



Fig. 2. Lampsilis ovata ventricosa (Barnes). Typical male from the Shenango 

 River, Clarksville, Mercer Co., Pennsylvania, collected September 21, 1908; C. M. Cat. 

 No. 61.3404. 



Fig. 3. Lampsilis ovata ventricosa (Barnes). Typical half-grown gravid female 

 from the Shenango River, Clarksville, Mercer Co., Pennsylvania, collected September 

 21, 1908; C. M. Cat. No. 61.3404. 



Fig. 4. Lampsilis ovata canadensis (Lea). Male from Lake Erie, Presque Isle 

 Bay, Erie, Erie Co., Penn.sylvania, collected May 21, 1909; C. M. Cat. No. 61.3982. 



Fig. 5. Lampsilis ovata canadensis (Lea). Female from Lake Erie, Presque Isle 

 Bay, Erie, Erie Co., Pennsylvania, collected May 22, 1909; C. M. Cat. No. 61.3982. 



