AVA NOTES ON FLORIDA UNIONIDAi—SIMPSON. 
an undeseribed species, but as the form throughout is more like U. 
Downiet than any shell | know of, and as there is a complete series con- 
necting with that species, | believe them to be but a southern form oft ; 
the Georgia shell. In all of them the ventral outline is considerably 
inflated, though sometimes slightly constricted nearly opposite the 
beaks; fiers is more or less of a posterior ridge; the dorsal region is — 
full; the anterior cicatrices deep, and the nacre is rather dull colored. 
Three of these specimens, which are among the smallest and farthest— 
removed from the type, were sent from Lake Woodruff, Florida, by 
Berlin H. Wright, and labeled by him U. Anthonyi, Another from— 
the same lake, in Mrs. Andrews’ collection, though of small size, ap-— 
proaches nearer to Dr. Lea’s shells from Georgia and South Carolina. 
arr 
STE ASN ane N TT REELS 
GROUP OF UNIO MODIOLIFORMIS. 
RS en er re 
This assemblage of unios, which contains quite a number of nominal 
species, ranges from North Carolina to Tennessee, west, perhaps, to— 
Mississippi, and south to middle Florida. The group consists of oblong 
Shells, rather thin in structure, more or less inflated, and rounded be- 
fore and behind; varying from tawny yellow or brown to greenish, and 
always more or less rayed, often beautifully so. They approach the — 
parvus group in some characters, but are larger, rather wider, and — 
usually thinner in structure, but often have the same brilliantly irides- 
cent nacre. The line is not very distinct between these species and the - 
group of nashvillensis. The latter are usually solider shells, have often 
reddish or lurid and rarely iridescent nacre, and are more pointed at 
the posterior end, which is usually somewhat angulated in outline. 
Individuals are very numerous, and as a consequence the species are _ 
quite variable. 
= 
Ng I er pe 
Unio modioliformis Lea, 
(Plate Lvi, Figs. 2, 3, 6.) 3} 
Unio modioliformis Lea, Obs. 1, p. 209, Pl. x11, Fig. 40, Feb. 7, 1834. Santee Canal, 
South Carolina; Ravenel. - 
Unio exiguus Lea (Plate Lv1, Fig. 1), Obs. 11, p. 29, Pl. vir, Fig. 1. Dee. 1, 1838. 
Chattahoochee River, Columbus, Ga; Dr. Boykin. 
Unio nigrinus Lea (Plate Ly1, Fig. 4), Obs. v, p. 40, Pl. xxiv, Fig. 44. March 5, 
1852. West Florida; Maj. Le Conte. 
Unio rutilans Lea (Plate Lyi, Figs. 2-5), Obs. v1, p. 59, Pl. rx, Fig. 41. Nov. 4, 1856. 
Othcalooga Creek and Columbus, Ga; Bishop Elliott. 
Unio subellipsis Lea (Plate Lv, Fig. 1), Obs. v1, p. 62, Pl. x, Fig. 44. Nov. 4, 1856, 
Creeks near Columbus, Ga.; Bishop Elliott. 
Unio Averillit B H. Wright (Plate Lvir, Fig 6), Proe. Acad, Nat. Sci., Phila., 1888, 
p. 115, Pl. 1, Fig. 2. Lake Ashby, Volusia County, Fla. | 
i TO 2 EES 
A handsome, widely-distributed, abundant, and very variable species. — 
It ranges north to North Carolina, south to central Florida, and I found 
it among Lea’s duplicates, with shells sent by Spillman, said to be from 
Columbus, Miss. Lea deseribed JU. modioliformis from a fully adult 
female specimen, which accounts for the spreading out of the posterior 
ent fone 
cat int AN 
