264. [FEBRUARY, 
Anod. denigrata, Lea, 1852, x. 285, 25, 45. 
excurvata, Desay, Zool. of New York, 202, 17, 233. 
fragilis, Zam. An. sans Vert. vi. 85. 
ferruginea, Lea, viii. 225, 19, 43. 
Ferussaciana, v. 45, 6, 15. 
Footiana, Lea, viii. 226, 20, 44. 
gibbosa, Say, Long’s Ex. to St. Peter’s, 1824, il. 265. Lea, Synopsis, 50. 
gigantea, Lea. vi. 1,1, 1. 
glauca, Valen. Lea, Synopsis, 50. 
Delassert, Recueil de Coquilles, pl. 13, fig. 3. 
grandis, Say, Dissem. 1829, 341. 
Lea, Synopsis, 51. 
corpulenta, Cooper, MSS. 
Harpenthis, Lea, viii. 224, 19, 42. 
imbecilis, Say, Dissem. 1829. 
incerta, Lea, 1834, v. 46, 6, 16. 
implicata, Say, Dissem. 350. 
Gould, Invert. of Mass. 118, 78. 
A. Newtonensis, Lea, vi. 79. 21, 66. 
impura, Say, Dissem. 1829. Lea, Synopsis, 53. 
Linneana, Lea, xX. 289, 27, 51. 
lugubris, Say, Disseminator, 1829, 340. 
Marryattana, Lea, vill. 226, 20, 45. 
marginata, (4) Say, Nicholson’s Encyclop. iv. pl. 3. fig. 1. 
Nuttalliana, Lea, vi. '77, 20, 62. 
oblita, Lea, 1852, x. 290, 28, 52. 
opaca, Lea, 1852, x. 285, 25, 46. 
Oregonensis, Lea, vi. 80, 21, 67. 
ovata, Lea, vi. 2, 2, 2. 
pavonia, Lea, vi. 78, 21, 45. 
Pepiniana, Lea, vi. 96, 16, 51. 
plicata, Ha/d. Journ. Acad. Nat. Se. viii. 202. 
salmonia, Lea, vi. 45, 14, 41. 
Stewartiana, Lea, v.47, 6, 17. 
suborbiculata, Say, Amer. Conch. pl. 11. 
subcylindracea, Lea, vi. 106, 24, 117. 
subvexa, Coz., Sillim. Journ. xxv. 341, 1, 12. 
teres, Con. New Fresh Water Shells, 47, 7, 2. 
 virens, Lea, x. pl. 28. fig. 53. 
Wahlamatensis, Lea, vi. 68, 20, 64. 
NOTES. 
(a.) Unio asper. Ferussac considered this species and Say’s apiculatus the 
same; but there is a strongly marked difference in the arrangement of the 
tubercles and in the form of the shells posteriorly. (Guerin’s Mag. 1835.) 
(b.) U. cariosus. In my Monograph I followed Ferussac in referring U. 
luteola, Lam., to this species, but his description does not apply. It very well 
describes U. siliguotdews, Barnes, in an early stage of growth. 
