THE 
* CONCHOLOGISTS’ 
EXCHANGE. 
67 
and carinate to apex; aperture oval and half 
the length of the shell. 
This fine shell is very common in all our 
river sloughs and small lakes, and is sometimes 
found in the river. It is a variable shell in 
respect to outline and the carination of its 
_ whorls. Sometimes all its whorls are carinate ; 
“again, the body-whorl is perfectly rounded. It 
is alee equally variable in regard to thickness, 
as often the body-whorl is very finely reticulat- 
ed with revolving striz, and at other times de- 
void of them. The habits of the animal seem 
to be very similar to those of Can:peloma. 
To be Continued 
NOTES UPON THE UNIONIDA OF 
SOUTHERN FLORIDA. 
BY DR. 
BER 
S. HART WRIGHT 
LIN H. WRIGHT. 
AND 
We 
w 
We have collected extensively of Uniones in 
the upper St. John’s River region during the 
past threg years, and have satisfied ourselves 
concerning certain points. Now we will give 
to the readers of THE CONCHOLOGISTS’ Ex- 
CHANGE the results. 
Unio Anthonyi, Lea. 
This shell is found in the St John’s River, 
in the vicinity of Blue Springs Landing, about 
175 miles south of Jacksonville. It is nota 
plentiful shell, but may always be recognized 
by its flattened sides and plicated posterior 
slope. It properly belongs to the plicate group, 
as Dr. Lea suspected. 
Unio aheneus, Lea. 
We found this shell in but one locality, viz: 
Lake Ashby, Volusia County. Mr. J. B. Upson 
has collected it in a small creek which. flows 
into the St. John’s River, near Palatka. The 
form in Lake Ashby is not typical, but is 
heavier, has a more arched dorsal line and 
heavier teeth, and the hinge line is shorter, 
‘The figure given by Dr. Lea is of a young 
shell. 
| Le pidus, ( 
Unio amyedalum, Lea. 
eae) ’ 
This species is found in Lake Dias, Volusia 
County, also in Lake Monroe, Lake Beresford, 
and in the St. John’s River, at Blue Springs 
Landing. We have a great many forms which 
we have doubtfully referred to this species 
Possibly further research will result in finding 
some new species of this general form. The 
forms found run into C7220 troszzlus, Lea and 
rould, 
Unio angustatus, Vea. 
This shell has been collected in Black Creek, 
near Palatka, by Mr. J. B. Upson. The speci- 
mens are very characteristic. 
Unio arctatus, Conrad. 
This species may be credited to Southern 
Florida with a doubt. Some of our best con- 
chologists have pronounced a shell which we 
think a variety of U. aheneus, Lea, to be this 
species. Possibly we are mistaken. All of 
the shells which we have seen, while bearing 
the general outline of U. arctatus, Conrad, are 
too much inflated, and have a rougher epider- 
mis and different nacre. 
To be Continued. 
THE GIBRALTAR AND TANGIER FORMS 
OF PARMACELLA. 
BY T. D. A. COCKERELL, 
In the * Journal of Conchology,”’ for 1886, 
I described some spirit-preserved specimens of 
Parmacella from Gibraltar, and pointed out 
the characters wherein they differed from the 
most nearly-allied species, the P. Valenciennti of 
Webb and Van Beneden, Since then I have 
received living examples from Tangier, on the 
opposite African coast, differing in no respect 
from the Gibraltar forms, and a careful exami- 
nation of them has led me to consider them 
rather as varieties of P. Valenciennt? than a 
distinct species, particularly as the form found 
| by Hidalgo in the central part of the peninsula 
