430 NOTES ON FLORIDA UNIONIDAZ—SIMPSON. 
is more inflated, has compressed cardinals, aud a narrow hinge plate, a 
shell I should refer to chickasawhensis. Another, a right valve, was | 
entered with this species inthe Museum collection (Museum No, 84574), 
and credited to West Florida; Maj. Le Conte, in the record book; but 
Lea does not mention this valve in his description, and states that buta _ 
single specimen was sent by Le Conte. 
Sometime ago, in working over the Lea duplicates, I found a left valve 
that recalled succissus, and, on comparing, saw that 1t belonged with the 
one said to come from west Florida. Dr. Lea had labeled it and the 
shells with it “ Unio rubiginosus Lea, cerinus Con., Alexandria, La., Dr. 
Hale.” Itis not rubiginosus or succissus, inmy opinion, but agrees pretty 
well with the description and figure of Conrad’s species, which is probably 
a valid one. Unio cacao, described from a single shell from west Florida 
seven years later, is merely a younger specimen of succissus, and agrees 
with the type of that speciesin every respect. Lea has placed the latter 
in his collection with chickasawhensis, rotundatus, and lenticularis, and 
the former with amabilis, tellicoensis, and glandaceus, more than a thou- 
sand numbers distant. 
GROUP OF UNIO ANODONTOIDES. 
A striking assemblage of species typified in America by a common 
Mississippi Valley form, with a very wide and extra lmital distribution, 
but which is quite constant in its characters throughout its entire range. 
The well-known JU. pictorum and several HKuropean and west Asiatic 
species probably group with it. 
Unio anodontoides Lea. 
(Plate LxxI, Fig. 7; Plate Lxxm, Figs. 1, 2, 4.) 
Onio anodontoides Lea, Obs. I, p. 91, Pl. vi, Fig. 11, May 7, 1830. 
Unio floridensis Lea (Plate LXxu, Fig. 3), Obs. v, p. 30, Pl. xx1, Fig. 31, Mar. 5, 1852. 
Chacktaéhatchi River, west Florida; Maj. Le Conte 
This species is so well known that itis scarcely necessary to comment 
on it. It is abundant throughout the Mississippi area, and over most, 
if not all, that part of the United States which is drained into the Gulf, 
as such localities as ‘Colorado River, Texas;” ‘‘ Withlacoochee River, 
Florida;” ‘Marietta, Ohio;” and Lodge Pole Creek, Colorado, where 
it was collected by the writer, will show. In the Ohio River, Texas, 
and some of the other Southern States it attains large dimensions; in 
south Georgia and Florida it becomes more fragile, is of moderate size, 
and is often more rounded on the posterior margin, and this form is evi- 
dently what Dr. Lea has described as U. floridensis. Specimens col- 
lected by Mr. C. W. Johnson from the Withlacoochee River, now in the 
Museum (Museum No. 104037) agree exactly in outline with the figure 
and description of that shell m the fifth volume of the Observations. 
Lea speaks of this species as having remarkably small teeth, a char- 
acter always found in anodontoides, and of its resemblance to the latter 
Bh 
nin 
