209 ANNALS OF THE CARNEGIE MUSEUM. 
(Ortmann); Raystown Branch, Everett, Bedford County (PE. 
Nordgren); Shober’s Run, Bedford Springs, Bedford County (A. 
Koenig); Frankstown Branch of the Juniata River, Huntingdon and 
Alexandria, Huntingdon County (Atkinson); Frankstown Branch, 
Hollidaysburg, Blair County (Ortmann); West Branch Mahantango 
Creek, Richfield, Juniata County (Atkinson); Middle Creek, Free- 
burg, Snyder County (Atkinson); Canal at Watsontown, Northumber- 
land.County (Atkinson); West branch of the Susquehanna, Williams- 
port, Lycoming County (Atkinson); Driftwood Branch of the Sinne- 
mahoning Creek, Driftwood, Cameron County (Ortmann); Beaver 
Dam Creek, Flinton, Cambria County (Atkinson); Cush-Cushion 
Creek, Green Township, Indiana County (Atkinson). 
14. Unio fisherianus Lea. 
White Clay Creek, Chester County (Hartman & Michener); one 
specimen was found in the Schuylkill at Philadelphia (Gabb). It is 
a species belonging to the Potomac drainage, but has not yet been re- 
ported from any place in that drainage in Pennsylvania. 
Not represented from the state in the Carnegie Museum. 
Unio fuliginosus Lea from Cobbs Creek (a branch of Darby Creek, 
near Essington, Philadelphia County) is quoted twice by Simpson 
under U. complanatus (p. 723) and under UV. zcferinus Conrad (p. 
727). The latter is a southern form, and it is not very likely that it 
is found in Pennsylvania. 
The above list at least somewhat extends our knowledge of the dis- 
tribution of the eastern Unionide. 
Unio complanatus seems to be as ubiquitous in, and characteristic 
of, the Atlantic drainage as U. gébbosus is for the Ohio drainage. It 
goes far up into the headwaters of the Susquehanna drainage. ‘The 
same is the case with Strophitus undulatus, Symphynota viridis, 
Alasmidonta undulata, and Alasmidonta marginata varicosa, yet it 
seems as if these four species are not so frequent in the larger rivers. 
According to the present records, ZLampsilis cariosa and Lampstlis 
radiata seem to prefer the larger rivers, although they ascend also toward 
the headwaters. The distribution of Lampsilis ochracea remains 
to be investigated. It is known from the region of tidewater, but 
not farther up. Lampszlis nasuta so far is restricted to the Delaware 
drainage, and is absent from that of the Susquehanna and farther 
