age 
426 NOTES ON FLORIDA UNIONIDA—SIMPSON. 
found this species rather abundant in Horse Creek, Manatee County, | 
and these specimens had a rough, dark epidermis, and were wedge- _ 
shaped when viewed from the base. Five shells from the St. Johns, 
donated to the Museum by Mr. B. H. Wright (Museum No. 91137 ) are 
much like those from Horse Creek, but show a dark-greenish ground 
with feeble rays when wetted or held up to the light. The species is 
larger, not quite so obovate, less inflated, and thinner than U. minor. 
A specimen in Mrs. Andrews’s collection from F. Rugel, and labeled by 
him “ Alabama,” I regard as this species. 
Unio amygdalum Lea. 
(Plate Lxvu, Fig. 3.) 
Unio amygdalum Lea, Obs. tv, p. 33, pl. XXxIx, Fig. 1. Aug. 18, 1843, Lake George; 
S. B. Buckley. 
It is quite probable that this species and the one preceding and the one 
following it are forms of the same thing, yet with the limited material I 
have I hardly feel justified in uniting them. Several of Lea’s speci- 
mens of this are very thin, yellowish ash, quite stron gly rayed, and are 
fringed at the posterior end by the frayed outgrowth of the epidermis. 
Another in his collection, from Lake George (Mus. No. 86128), is wider, 
darker, and solider; closely approaching vesicularis. 
It inhabits from Dooly County, Ga., to central Florida. 
Unio lepidus Gould. 
(Plate Lxvil, Fig. 1; Plate Lx1x, Fig. 3.) 
Unio lepidus Gould, Proc. Bost. Soc. Nat. Hist., vol. vi, p. 15. Creek near Lake 
Monroe. 
From Gould’s description this is very close to the last two species, 
as he says it is nearly allied to U. trossulus, but is larger, more fragile, 
and the cardinal teeth are more compressed. (Otia Conchologica, p. 
222.) The species is not in Lea’s collection, but there are among the 
Museum shells three fine examples from the St. Johns, donated by 
Mr. B. H. Wright (Museum No. 91140), and by him labeled lepidus, 
which are, no doubt, that species. They are a little wider than vesieu- 
laris or most of the examples of amygdalum I have seen; are more 
oblique; are yellowish, shading to dark green on the posterior portion, 
and more or less rayed throughout. The nacre is shaded salmon and 
bluish, and is iridescent posteriorily. I have other examples before 
me which are evidently the same. 
Unio Singleyanus Marsh. 
(Plate Lxvin, Figs. 4,5.) 
Unio Singléyanus Marsh, Joliet Weekly News (a newspaper), May 1, 1891. The Nau- 
tilus, vol. v, No. 3, p. 29. 
Shell smooth, oval, slightly depressed; inequilateral; valves rather 
thick, squarish before, rounded behind; beaks small and flat; epidermis 
