UNIO 657 
Unio wrwinensis Lea, Pr. Ac. N. Sci. Phila., II, 1872, p. 159; 
Jl. Ac. N. Sci. Phila., VITI, 1874, p. 44, pl. xv, fig. 42; Obs. 
XIII, 1874, p. 48, pl. xv, fig. 42. 
Unio infuscus Lea, Pr. Ac. N. Sci. Phila., II, 1872, p. 160; 
Pisce N. oc, Phila, Vill, 1874, p. 51, pl. xvi, fig. 40: 
Obs., XIII, 1874, p. 55, pl. xvn, fig. 49. 
Umiorroims Tra, Pr. “ic. N. Sci. Phila., Il, 1872, p. 160; Jl. 
Ac. N. Sci. Phila., VII, 1874, p. 52, pl. xvi, fig. 51; Obs., 
XIII, 1874, p. 56, pl. xvmt, fig. 51. . 
Umo basalis Lea, Pr. Ac. N. Sci. Phila., II, 1872, p. 161; Jl. 
Ac. N. Sci. Phila., VIII, 1874, p. 48, pl. xvi, fig. 46; Obs., 
DOME TS 74." p. 52,‘ ply xvi, fie. 46. 
Unio subolivaceus Lea, Pr. Ac. N: Sci. Phila., IIT, 1973), p: 
A22 i Ac ON Sa. Phila; VIL 1874, "p. 57; pl. xx, fig. 56; 
Ons 1874) p61, ple xx fies'56: 
Unio infulgens LEA, Pr. Ac. N. Sciv Phila., III, 1873, p. 422; 
ieAcwne sen Bhilai; WIT 1874, >p- 60; plo xx fig. 59; Obs., 
Xi 1874; ps 64, spl xt, fig-50. 
Cmaarerratus aaa, (Pr Ac. N. Sei: “Phila. LI, 1873,;p: 422% 
Pi SNcrNe oeioiila Wi 18745. p. 55; pl. xix, fies-533 
Obs. 2c 1874. ps0, pl. xx, fig. 53. 
Umo corneus LEA, Pr. Ac. N. Sci. Phila., II, 1873, p. 423; Jl. 
On hes Sch eiid.. Ville 1674, 0p; 50; pl. xx), fic...58.5:Obs., 
Pane Tes Acc pod pl Sex, fig <5 8: 
Arconaia provancheriana Piispry, Nat. Canadienne, XX, 1890, 
fest teoin, Ae. Neila. LoQ24p. 132, pl.cwit, fiss.:4-6. 
This species was described by Solander in Latin, but the 
manuscript was never published and is now in the British Mu- 
seum. Mr. Edgar A. Smith kindly examined it for me and 
informed me that Dillwyn’s description in the catalogue is a 
translation from Solander. The name Mya complanata was 
used by Lister in Hist. Sive. Conch. (1770, p. 150), but Lister 
was not a binomial author. The Portland Catalogue is anony- 
mous and a mere sale list. 
Complanatus Dillwyn and purpureus Say both date from 
1817, and it is now impossible to determine which name had 
actual priority. But in view of the fact that the name com- 
