COLD-BLOODED VERTEBRATES. 37 



Creek, West Brcanch at Chester Heights, Markham and Con- 

 cordville, Wawa ; Ridley Creek, Media ; Cruni Creek, Trout 

 Run, Reese's Run near Central Square and first small tribu- 

 tary above, Swarthuiore ; Darby Creek, Collingdale, Fawkes 

 Run, Collar Brook, Whetstone Run, head of north branch of 

 Langford's Run, Addinghaui ; Cobb's Creek, Naylor's Run. 



Cyprinus carpio (Liutiaeus) — Carp. 



Introduced in many waters, the carp is now found in most 

 suitable localities. I met with it in the Brandywine Creek, 

 Chad's Ford; Chester; Ridley Creek, Media; Darby Creek; 

 Cobb's Creek and about Tinicum Island. 



Catostomus commersonnii (Lacepede) — Sucker. 



Found in all the creeks, which it ascends in the spring to 

 spawn. Brandywine Creek, Chad's Ford ; IMarcus Hook 

 Creek; Chester Creek, West Branch at Markham, Rock Run 

 at Wawa ; Ridley Creek , Darby Creek, Collingdale, Collar 

 Brook, Addingham, Fawkes Run, Whetstone Run, head of 

 north branch of Langford's Run, Cobb's Creek, Naylor's Run, 

 Tinicum Island, Lester. 



Erimj'zou siicetta oblongus (Mitchill) — Mullet. 



Frequent in some streams, and doubtless more abundant 

 than here determined. Brandywine Creek, Chad's Ford ; 

 Chester Creek, Cheyney, on East Branch ; Ridley Creek ; 

 Darby Creek, Collar Brook. 



Ameitrrus catus (Linnaeus) — White Cat-fish. 



Occurs in the tidal regions of the Delaware. Marcus Hook, 

 Chester and Tinicum Island. 



Ameitirus nebulosus (Le Sueur) — Yellow Cat-fish. 



Common in most all waters. Brandywine Creek, Chad's 

 Ford ; Marcus Hook, Marcus Hook Creek ; Chester Creek, 

 near Wawa, Rocky Run, Cheyney ; Ridley Creek, Trout Run, 

 Media; Crum Creek; Darby Creek, Whetstone Run, Cobb's 

 Creek, Tinicum Island, Lester, Long Neck. 



Schilbeodes gyrinus (Mitchill) — Stone Cat-fish. 



This small species has not yet been recorded from these 

 limits, though doubtless occurs in the region of Tinicum Island. 



