376 MEMOIRS OF THE CARNEGIE MUSEUM, 



EXPLANATION OF PLATE XVII. 



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



Fig. L Lampsilis luteola (Lamarck). Male from Mahoning River, Edinburg, 

 Lawrence Co., Pennsylvania, collected September 15, 1908; C. M. Cat. No. 61.3466. 



Fig. 2. Lampsilis luteola (Lamarck). Gravid female from Mahoning River, 

 Edinburg, Lawrence Co., Pennsylvania, collected September 15, 1908; C. M. Cat. No. 

 61.3466. 



Fig. 3. Lampsilis luteola rosacea (DeKay). Male, deep water form, with very 

 regular growth-rests, from Lake Erie, Presque Isle Bay, Erie, Erie Co., Pennsylvania, 

 taken at a depth of fourteen to sixteen feet, collected July 22, 1909; C. M. Cat. No. 

 61.4033. 



Fig. 4. Lampsilis luteola rosacea (DeKay). ]\Iale, form of the open shore, from 

 Lake Erie, outer shore of Presque Isle, Erie, Erie Co., Pennsylvania, from a depth of 

 ten feet, collected July 11, 1910; C. M. Cat. No. 61.4862. 



Fig. 5. Lampsilis luteola rosacea (DeKay). Female, normal form of the bay, 

 from Lake Erie, Presque Isle Bay, Erie, Erie Co., Pennsylvania, taken from shallow 

 water, collected July 9, 1910; C. M. Cat. No. 61.4861. 



Fig. 6. Lampsilis radiata (Gmelin). Male from North Branch Susquehanna 

 River, Tunkhannock, Wyoming Co., Pennsylvania, collected August 21, 1909; C. M. 

 Cat. No. 61.4054. 



Fig. 7. Lampsilis radiata (Gmelin). Gravid female from North Branch of the 

 Susquehanna River, Tunkhannock, Wyoming Co., Pennsylvania, collected August 21^ 

 1909; C. M. Cat. No. 61.4054. 



Fig. 8. Lampsilis ovata (Say). Young specimen, probably male, from French 

 Creek, Cambridge Springs, Crawford Co., Pennsylvania, collected September 13, 1909; 

 C. M. Cat. No. 61.4010. 



Fig. 9. Lampsilis ovata (Say). Young specimen, probably female, but female 

 shape barely indicated, from French Creek, Cambridge Springs, Crawford Co., Penn- 

 sylvania, collected September 13, 1909; C. M. Cat. No. 61.4010. 



