COLD-BLOODED VERTEBRATES. 35 



Salvelinus fontinalis (Mitchill) — Brook Trout. 



Formerly brook trout were doubtless to be found in the 

 cooler streams^ though now where they occur are largely the 

 result of restocking. Native trout were reported from the 

 basin of Crum Creek, at least in a tributary known as Trout 

 Run, in earlier times. Though the salmon (Salmo salar) was 

 introduced in the Delaware River many years ago, and a few 

 subsequently reported, none were ever noted from these limits. 



Osmerus mordax (Mitchill) — Smelt. 



Ascends the Delaware in small numbers during the spring 

 to the head of tide. Smelts have occasionally been found 

 near Chester. 



Anguilla chrisypa (Rafinesque) — Eel. 



Common in most all waters. Marcus Hook, Marcus Hook 

 Creek ; Chester, Chester Creek ; Wawa, Rocky Run ; Ridley 

 Creek, :\Iedia ; Crura Creek, Darby Creek, Whetstone Run, 

 Cobb's Creek ; Tinicum Island, Long Neck. 



Hybognathus nuchalis regius (Girard) — Silvery Minnow. 



Abundant in the Delaware tide-water. Found at Tinicum 

 and Chester. 



Semotilus bullaris (Rafinesque) — Fall-fish. 



Common in most all waters, where it is the largest and 

 most vigorous cyprinoid. Brandywine Creek, Chad's Ford, 

 Painter's Run, Brandywine Summit ; Marcus Hook Creek ; 

 Chester Creek, West Branch at Concordville, Markham and 

 Chester Heights, Green Creek, East Branch near Wawa and 

 Rocky Run ; Ridley Creek ; Crum Creek, tributary above 

 Reese's Run ; Darby Creek, Whetstone Run, Collar Brook, 

 Broomall, near Manoa and above ; Cobb's Creek, Naylor's Run. 



Semotilus atroniaculatus (Mitchill) — Creek Chub. 



Abundant in the smaller streams, where it often associates 

 with small fish, as suckers, dace, red-fins, etc. Brandywine 

 Creek, Chad's Ford, Painter's Run, Brandywine Summit ; 

 Chester Creek, West Branch at Chester Heights, Markham 

 and Concordville ; Ridley Creek ; Crum Creek and Trout Run ; 

 Darby Creek, Fawkes Run near Newtown Square, head of 

 north branch of L,angford Run, Collar Brook, Cobb's Creek. 



