274 MEMOIRS OF THE CARNEGIE MUSEUM. 



Localities represented in the Philadelphia Academy: 



Delaware River, Kaighn's Point, Camden, Camden Co., New Jersey (John Ford); Delanco (H. A. 



Pilsbry), Burlington Island (H. W. Fowler), and Florence (H. W. Fowler), Burlington Co., New 



Jersey. 

 Swartswood Lake, Sussex Co., New Jersey (H. A. Pilsbry & S. N. Rhoads), drains to Delaware River. 

 Cohansey Creek, Bridgeton, Cumberland Co., New Jersey (S. N. Rhoads) coastal plain of southern New 



Jersey. 

 Potomac River, Washington, D. C. (John Ford); .Alexandria, Fairfax Co., Virginia (G. W. Tryon, Jr.). 



Distribution and Ecology in Pennsylvania (See figs. 28 & 29) : In Pennsylvania 

 this species has two ranges: one in the extreme eastern end of the state, and the 

 other in the northwest, in Lake Erie. Its metropohs in the east is found in the 

 tidewaters of the Delaware River; farther up (above Trenton, New Jersey) it is 



Fig. 29. 

 • Eurijnia nasuta (western range). 

 + Eurynia recta. 



rare. It also has been reported from the Schuylkill, probably its lower part, 

 as far up as Chester Co. The record from Perkiomen Creek in Montgomery Co. 

 is doubtful (See above). In addition I found a single individual in the Schuylkill 

 Canal. It has never been found in any of the smaller tributaries, and no records 

 are at hand from anywhere in the Susquehanna or Potomac drainages in Penn- 

 sylvania. 



I found it in large numbers in the tidewater of the Delaware opposite Phila- 

 delphia at Fish House. Here it inhabits the shores of the Delaware, which re- 

 sembles rather a lake than a river. The bottom at this point is fine sand, and the 



