ORTMANN: UNIONID© OF WESTERN PENNSYLVANIA. 202 
Seventeen forms have been found ‘They all have been reported 
previously from Lake Erie and its drainage in Ohio. (See Sterki, 
Proceedings Ohio Academy of Sciences, 4, 1907. ) 
1. Lampsilis ventricosa (Barnes). 
Miles Grove ; outer beach of Presque Isle ; and Presque Isle Bay. 
The lake form is peculiar, being smaller and lighter in color, than 
the typical form of the Ohio drainage. ‘This species has also been 
found in Conneaut Creek, and there represents the typical form. 
2. Lampsilis luteola (Lamarck). 
Outer beach of Presque Isle, beach pools, and Presque Isle Bay. 
It also is found in Conneaut Creek. 
The lake form is peculiar, small and stunted. ‘The form in Con- 
neaut Creek agrees with the form from the Ohio drainage. 
3. Lampsilis recta (Lamarck). 
In a beach pool of Presque Isle, and in Presque Isle Bay. 
4. Lampsilis nasuta (Say). 
Miles Grove. Beach pools of Presque Isle and Presque Isle Bay. 
5. Proptera alata (Say). 
Presque Isle Bay. 
Smaller than the typical form. 
6. Proptera gracilis (Barnes). 
Presque Isle Bay. 
7. Ptychobranchus phaseolus (Hildreth). 
Presque Isle Bay. 
8. Strophitus undulatus (Say). 
In Conneaut Creek (not as yet found in the lake in Pennsylvania). 
9g. Anodonta imbecillis Say. 
Beach pools of Presque Isle and Presque Isle Bay. 
1o. Anodonta grandis footiana Lea. 
Beach pools of Presque Isle and Presque Isle Bay. 
This variety of 4. grandis is very constant in the lake, and. there 
are only very rare cases of individuals approaching the typical form. 
11. Anodontoides ferussacianus subcylindraceus (Lea). 
Beach pools of Presque Isle and Presque Isle Bay. 
This form is extremely abundant in certain beach pools, and rather 
uniform in character, no intergrades toward the typical ferussactanus 
having been observed. 
12, Symphynota compressa Lea. 
A single individual was found by the writer in a beach pool on Presque 
Isle. 
