174 



Pisum ventricosum, H. & A. Adams, Loc. sup. cit. ii, 660, 1858. 

 Pisidium ventricosum, Prime, Cat. Corb. 15, 1863. 



Smith. Inst. Misc. Coll., Prime Monog. Corb. 72, f. 79,. 



80, 1865. U. S. of America.. 



46. P. Virginicum, Bourguignat. 



Tellina Virginica, Gmelin, Syst. Nat. 3236, pi. clix, f. 15,, 



1788. 

 Tellina pusilla (pars), Dillwyn, Cat. ii, 106, 1817. 

 Cyclas duhia, Say, Nichols. Encycl. 1st Amer. edit, ii, 4, pi.. 



i, f. 10, 1817. 

 Physemoda cequalis, Rafinesque, Ann. gen. Sci. phys. et nat.. 



V, 319, 1820. 

 Cyclas Vh'ginica, Ferussac, Mag. Zool. v, 1835. 

 Cyclas dubia, Say, Gould Invert. 75, f. 56. 1841. 

 Pisidium ahruptum, Haldeman, Proc. Ac. N. S. Phila. i, 53^,. 



1841. 

 Pisidium duhium, Haldeman, Loc. sup. cit. i, 103, 1841. 

 Cyclas dubiosa, Catlow & Reeve, Nomencl. 29, 1845. 

 Pisidium duhium, Say, J. N. H. Bost. vi, 354, pi. xi, f. 4 — 6,, 



1852. 

 Pisidium cequale, Rafinesque, Loc. sup. cit. vi, 367, 1852. 

 Pisidium Virginiciwi, Bourguignat, Rev. Mag. Zool., 1854. 

 Sphairium dubium, Deshayes, Brit. Mus. Cat. Conchif. 266,, 



1854. 

 Pisum Virginicum, Deshayes. Loc. sup. cit. 281, 1854. 

 Pisum abruftum, Deshayes, Loc. sup. cit. 281, 1854. 

 Pisum dubium, Deshayes, Loc. sup. cit. 282, 1854. 

 Musculium dubium, H. & A. Adams, Gen. Rec. Moll, ii, 451,. 



1858. 

 Musculium ahruptum, H. & A. Adams, Loc. sup. cit. ii, 451,. 



1858. 

 Musculium Virginicum, H. and A. Adams, Loc. sup. cit. ii, 



452, 1858. 

 Pisidium Virginicum, Bourguignat, Prime, Cat. Corb. 13, 



1863. Smith. Inst. Misc. Coll., Prime Monog. Corb. 



61, 62, 1865. U. S. of America,. 



TO BE EXCLUDED. 



Pisidium ahruptum, Haldeman. = P. Virginicum. 

 Pisidium acutum, Pfeiffer. = P. Hensloivianum. 

 Pisum Adamsi, Deshayes. = P. Jamaicense. 

 Physemoda cequalis, Rafinesque, = P. Virginicum. 

 Pisidium altile, Anthony, = P. compressu7n. 

 Pisidium ampluyn, Ingalls. = P. Nov.-Ehoracense. 



