3G4 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XI. 

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



Fig. L Anodonta cataracta Say. Gravid female of pond-form, of good size, from 

 Pond near Paper Mill, Lockhaven, Clinton Co., Pennsylvania, collected August 24, 

 1909; C. M. Cat. No. 6L4173. 



Fig. 2. Anodonta implicata Say. Normal specimen, rather swollen, from Timber 

 Creek, Newbold, Gloucester Co., New Jersey, collected by C. H. Conner; C. M. Cat. 

 No. 61.4442. 



Fig. 3. Anodonta implicata Say. Young specimen of the river-form, from Dela- 

 ware River, Yardley, Bucks Co., Pennsylvania, collected August 24, 1908; C. M. Cat. 

 No. 61.3693. 



Fig. 4. Anodonta ohiensis Rafinesque. Gravid specimen, rather large, from Lake 

 Erie, beach-pool of Presque Isle, Erie, Erie Co., Pennsylvania, collected June 2, 1908; 

 C. M. Cat. No. 61.3291. 



Fig. 5. Anodontoides ferussacianus (Lea). Specimen of medium size, from Little 

 Shenango River, Greenville, Mercer Co., Pennsylvania, collected June 5, 1908; C. M. 

 Cat. No. 61.3294. 



Fig. 6. Anodontoides ferussacianus buchanensis (Lea). Typical specimen of 

 medium size from Lake Erie, beach-pool of Presque Isle, Erie, Erie Co., Pennsylvania, 

 collected June 2, 1908; C. M. Cat. No. 61.3295. 



Fig. 7. Alasmidonta (Alasmidonta) undulata (Say). Gravid female of normal 

 shape, from Conodoguinet Creek, Carlisle, Cumberland Co., Pennsylvania, collected 

 August 13, 1910; C. M. Cat. No. 61.4660. 



