PELECYPODA. 27 



*Alasmidonta marginata (Say). 



Simpson, Descriptive Cat. Naiades, 1914, p. 504. 

 Alasmodonta marginata Say, Nich. Encycl., 1816, vol. 2, pi. 3, 

 fig. 5. [United States.] 



Margaritana marginata Gould, Inv. Mass., 1870, p. 177, fig. 479. 



Me. — Westbrook, Dennys River. 

 N. H. — Connecticut River, Hanover. 

 Vt. — Otter Creek, Wallingford. 



Mass. — Blackstone River, Andover; West Brookfield; Sher- 

 born. 



R. I. — Cunlift' Pond, Providence. 

 Conn. — Housatonic River, Derby. 



*Unio complanatus (Dillwyn). 



Gould, Inv. Mass., 1870, p. 167, fig. 472. Simpson, Descriptive 

 Cat. Naiades, 1914, p. 651. 



Mya complanata Dillwyn, Catalogue, 1817, vol. 1, p. 51. " riv- 

 ers IN Virginia. * * * Maryland and New Jersey. * * * Missis- 

 sippi." 



Me. to Conn. — Common in almost every stream and pond. 



Unio complanatus mainensis Rich. 



Rich, Science, 1915, new ser., vol. 42, p. 580. " Songo Pond, 

 about three miles south of Bethel, Me." 



Me. — Ponds and lakes of Oxford Co. 



*Unio roanokensis northamptonensis Lea. 



Simpson, Descriptive Cat. Naiades, 1914, p. 668. 



Unio northamptonensis Lea, Proc. Acad. Nat. Sci. Phila., 1861, 

 p. 392. " Connecticut River, at Northampton. At Spring- 

 field * * * below Hartford * * * Neuse River, N. C." Lea, 

 Journ. Acad. Nat. Sci. Phila., 1862, ser. 2, vol. 5, p. 190, pi. 25, fig. 

 260. 



Mass. — Northampton; Springfield. 



Conn. — Connecticut River below Hartford. 



