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410 NOTES ON FLORIDA UNIONIDA:—SIMPSON. 
Lea attempts to separate his species from Conrad’s on the ground 
that the latter is not figured as a folded shell; that his differs in having 
larger plications, which are more interrupted, and in the color of the 
epidermis, which in infucatus when old is quite black. Yet in his own 
collection some of the specimens of Aleinianus are nearly without seulp- — 
ture, and others are almost jet black, while those of infucatus vary from 
almost absolutely smooth to strongly corrugated throughout. Among 
hundreds of duplicates in the Lea collection from many localities I find 
every gradation, from inflated forms having a well-marked posterior | 
ridge to those which are lenticular; the sculpture varying from ab- 
solutely smooth to completely corrugated, and a range of color from | 
shining black to fulvous, and even green on young specimens. ; 
So far as I know the species is confined to the waters of Georgia and | 
northern Florida. ; 
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GROUP OF UNIO CRASSIDENS. 
Mostly solid triangular shells, with heavy epidermis, and a promi- ) 
nent ridge running from the beaks to the posterior ventral region, the | 
posterior slope of which is usually slightly folded, with nacre varying 
from white to salmon and purple. 7 
U. crassidens, an abundant species in the Mississippi drainage basin, _ 
is one of the largest and most ponderous of Unios. The other species | 
are distributed through the southeastern States. 
Unio Forbesianus Lea. 
5 1c D 7 t- « « : 
(Plates xLIx, Fig. 3, Plate L, Figs. 2, 3.) 
Unio Forbesianus Lea. Obs. v, p. 20, Pl. xvi, Fig. 17, Mar.5,1852. Type, Savannah R. 
Unio Moussonianus Lea. (Plate L, Fig. 4.) Obs. v, p. 24, Pl. xviu, Fig. 22, Mar. 5, 
1852. Type, Georgia; Barrett. 
Unio vestitus Lea. (Plate xix, Fig. 3; Pl. i, Fig. 1.) Obs. 1x, p. 11, Pl. xxv, Fig. 
259, Dec. 24,1861. Ogeechee R., Ga.; Le Conte and Anthony. 
U. Forbesianus and vestitus were described from young specimens, 
and in a careful examination of the types in Lea’s collection, as well as 
that of U7. Moussonianus, Lean not see any difference worthy of even 
varietal names. These shells bear considerable resemblance to the well 
known and abundant U. crassidens, but are less solid and do not attain 
the size of that species. U. Forbesianus has been collected by F. Rugel 
in Lake Monroe and Black Creek, Florida; these specimens, which now 
belong to Mrs. George Andrews, having been compared by the writer 
With Lea’s types. 
Unio monroensis Lea. 
(Plate Li, Fig. 1.) 
Unio monroensis Lea. Obs. Iv, p. 37, Pl. xu, Fig. 8, Aug. 18, 1843. Type, Lake 
Monroe, Fla., collected by Dr. Budd. 
U. monroensis is very close to the last species, differing from it only 
in being slightly less solid, in having more compressed teeth, and in 
