140 
THE NAUTILUS. 
Pisidium variabile Pme. Ditch at Kaighn’s Point. 
Pisidium compression Pme. Canal at Manayunk. 
UNI0NID.E. 
Unio complanatus Solander. Delaware and Schuylkill Rivers, 
very common; canal at Manayunk, very fine specimens; Muckini- 
pallus Creek, Glenolden, Delaware Co. (Vanatta); Corinthian 
Reservoir (Ford). 
Unio nasxtius Say. Delaware and Schuylkill Rivers, common. 
Typical locality. 
Unio radiatus Lam. Canal at Manayunk, abundant; Delaware 
River, not common. 
Unio heterodon Lea, Canal at Manayunk, uncommon ; canal in 
27th Ward (John Ford) ; Neshaminy Creek (C. W. Johnson). 
Unio ochraceus Say. Delaware River, common. (Type local¬ 
ity). 
Unio cariosus Say. Delaware River, rare. (Type locality.) 
Margaritana undulata Lea. Raccoon Creek, N. J.; Canal at 
Manayunk; Muckinipallus Creek, Glenolden, Delaware Co. (Van¬ 
atta); Neshaminy Creek (Johnson); “Delaware and Schuylkill 
Rivers” (Say). 
Margaritana marginata Say. Tohickon Creek, Bucks Co.; Ne¬ 
shaminy Creek (C. W. Johnson); Muckinipallus Creek, Glenolden, 
Delaware Co. (Vanatta). 
Anodonta fluviatilis Lea. Delaware and Schuylkill Rivers; 
canal, Manayunk, moderately common; Muckinipallus Creek, 
Glenolden, Delaware Co. (Vanatta) ; Wister’s Dam, Germantown 
(Stone) ; Lily Pond near Memorial Hall (V.). 
Ariodonta fluviatilis Tryoni Lea. Typical localities, Schuylkill 
River above Phila., and Delaware River at League Island; West- 
ville, N. J. (Fox). 
Anodonta undulata Say. Canal, 27th Ward (J. Ford). 
NOTE ON THE SPECIES OF VERONICELLA FOUND IN CENTRAL AMERICA. 
BY T. D. A. COCKERELL, N. M. AGR. EXP. STA. 
It must be confessed that our knowledge of the Central American 
forms of Veronicella is singularly inadequate, and the purpose of 
this note is mainly to draw attention to the matter, in the hope 
that those who have the opportunity will add to our information. 
