174 



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



Pisidium ventricoswn, 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. 

 Tellma 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 Virginica, Ferussac, Mag. Zool. v, 1835. 

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

 Pisidium abruptum, Haldeman, Proc. Ac. N. S. Phila. i, 53,, 



1841. 

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

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

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



1852. 

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

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

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



1854. 

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

 Pisum abruptum^ Deshayes, Loc. sup. cit. 281, 1854. 

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

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



1858. 

 Musculium abruptum, 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 abruptum, Haldeman. = P. Virginicum. 

 Pisidium acutum, Pfeiffer. = P. Jlensloivianmn. 

 Pisum Adamsi, Deshayes. = P. Jamaicense. 

 Physemoda cequalis, Rafinesque. = P. Virginicum. 

 Pisidium altile, Anthony, r=r P. eompressum. 

 Pisidium amplum, Ingalls. = P. Nov.-Eboracense. 



