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villensis in form, but differs in being quite thin and having a yellowish 
ground quite strongly rayed with dark green. It is found in Georgia. 
GROUP OF UNIO BUCKLEYI. 
Unio Buckleyi may be taken as the type of a very extensive group, 
distributed along that part of the Atlantic slope from North Carolina 
to south Florida. The shells are oval to oblong in outline, generally 
rounded before and behind, with rarely a conspicuous posterior ridge, 
and usually shining epidermis, varying from yellowish to chestnut or 
black, often greenish and beautifully rayed, especially in young speci- 
mens, but sometimes becoming squamose or lamellated and dull-colored 
when old. 
The teeth vary from thin and compressed to quite solid; the nacre is 
generally brilliant, and varies from silvery white to coppery or deep 
purple. Ina number of species of this group, as in that of obesus, the 
old shells become greatly developed at the posterior ventral point, so 
that the ventral outline is either straight or arcuate. There is a tend- 
ency in some of the more compressed forms to biangulation in the pos- 
terior region. 
Unio Buckleyi, Lea. 
(Plate Lvul, Figs. 6, 7; Plate Lrx, Figs. 1, 2; Plate Lx, Fig. 2.) 
Unio Buckleyi Lea, Obs. rv, p. 34, Pl. xxx1x, Fig. 2, Aug. 18, 1843. Lakes Monroe 
and George; 8. B. Buckley. 
Unio Buddianus Lea (Plate Lx, Figs. 3, 4), Obs. rv, p. 35, Pl. xi, Fig. 5, Aug. 18, 1843. 
Lakes Monroe and George; 8. B. Buckley. 
Unio Doret B. H. Wright (Plate Lx1, Fig. 3), Proc. Acad. Nat. Sci., Phila., 1888, p. 
115, Pl. m1, Fig.1. Lake Monroe; B. H. Wright. 
Unio Simpsoni B. H. Wright (Plate Lrx, Fig. 3; Plate Lx, Fig. 1), Proc. Acad. Nat. 
Sci., Phila., 1888, p. 117, Pl. v, Fig. 1. Lake Woodruff, Volusia County. 
Unio Dalli B. H. Wright (Plate Lx1, Fig. 2), Proc. Acad. Nat. Sci., Phila., 1888, p. 
119, Pl. v1, Fig. 1. Lake Beresford, Volusia County. 
Unio Oreuttii S. Hart Wright (Plate Lx1, Fig. 1), West Am. Scientist, Vol. 1v, No. 
36, p. 60. 
A protean species, very abundant throughout the greater portion of 
the State of Florida. lLea’s figured type represents a fully adult shell, 
and one that may be considered a fair average of the form under con- 
sideration. Mr. Lea says in his description: 
A number of specimens are before me, and they present many different forms, 
differing in many respects, as the varieties of the U. complanatus do from each 
other. The prevailing color of the nacre, which is very brilliant, is salmon, but 
many are purple; two only are white. The epidermis of all the older specimens is 
dark-brown, some are nearly black and without rays; the younger are smooth and 
polished on the outside, with numerous obscure green rays, larger on the poste- 
rior slope. The general outline of most specimens is like that of U. batavus (Lam.), 
but some individuals approximate to that of Unio ovalis (Flem.). 
There can be no doubt on examining the Lea series that he had a 
very good knowledge of the wonderful variation of this species. It 
== “Proc. N, M. 92 27 
