THE - CONCHOLOGISTS’ - 
EXCHANGE 51 
Science, page 54, says that the types of my 
Unio Upsonit came from the Mississippi River 
in the western border of Mercer County. 
This is a’mistake as my types of Unzo Upsoniz 
came from Kishawaukee River, Winnebago 
County, Illinois, and I have never laid any 
claims to having found this shell in Mercer 
County. There are a number of Southern 
species closely resembling Uxzo igamentinus. 
The light-colored variety is often received 
from collectors as Unio crassus, Say, but Mr. 
Lea said that the true crassws of Say was an 
European species. 
21.— Unio luteolus, Lam. 
This is a handsome and extremely variable 
species and is probably the most widely dis- 
tributed Uno in North America, having been | 
found as far north as the Red River of the | 
North, and is also reported from Texas. There 
are many Southern species very closely resem- 
bling /e¢eolus. It is found here in Pope and 
Edwards Creeks and abundantly in the sloughs 
of the Mississippi River. There seems to be 
four varieties of this shell here; one variety, 
found in Pope Creek, is entirely devoid of rays, 
in this respect closely resembling the Southern 
form, Unio stamineus, Con.; the second variety, 
found in Edwards Creek, is quite flat and 
beautifully rayed; the third variety, found in 
the river sloughs, is very much inflated and the 
male differs greatly from the female in outline, 
while the fourth variety is found in the river 
proper, and is very difficult to separate from 
the green variety of Unio Agamentinus, Lam- 
ark, as itis a thick, solid variety and very 
straight on the dorsal and ventral margins. 
22.— Unto lacryvmosus, Vea. 
® 
A fiae pustulose species found sparingly in 
the river sloughs and in the small lakes on 
the Bog Island, and seems to delight in the 
muddy bottoms of the sloughs and _ lakes. 
I.acrymosus is certainly closely allied with 
asperrimus, Lea, if not identical with it. In 
most cases I have found it associated with 
three of our rarest species, viz: mzltiplicatus, 
Mississitpiensis, and Margaritana confragosa. | 
) Fare. 
23.—Unio monodontus, Say. 
This very rare species in any beater is 
really a Margaritana, but was described as a 
Unio, and io generally classed as such. It 
occurs here only in the river and it certainly is 
a rare occurrence to find it here at all. I have 
never found one alive, but frequently find dead 
shells, which is probably owing to its very 
peculiar habits. I am informed that this 
species is usually found in or near the channel 
of the river, deeply imbedded in loose gravel 
and usually sheltered by some large rock, and 
seldom if ever moves unless disturbed by 
some agency no. its own. 
24.— Unio metanever, Raf. 
A beautiful pustulose species found very 
abundantly in the Mississippi river in deep 
water. It is a thick, heavy shell, usually cov- 
ered with very beautiful arrow-head markings, 
although a variety, which we also have here, 
is provided with a very dark green epidermis 
and is entirely destitute of rays. It is a slug- 
gish species and is found near the channel of 
the river, usually embedded in the banks of 
coarse gravel and sand. Years ago it occured 
rarely in Edwards Creek, but is now extinct in 
that stream. 
To be continued. 
NEW LOCALITIES. 
Ed. Conchologists’ Exchange, 
Sir :—A new locality, and the only one 
I have found, for Union amygdalum, \.ea, is 
Lake Dias, Volusia Co., Florida. Unzo oc- 
cultus, Lea, 1 have found in Lake Monroe, 
also, at the inlet of Lake Woodruff, but it is 
S. Hart Wright, M. D.., 
March 15, 1887. Lake Helen, Fla. 
PUBLICATIONS RECEIVED. 
List of Unionidz received during 1885 and 
Cana- 
dian Etomologist.—Science Observer (‘The 
Proceedings of the Boston Scientific Society). 
Bulletin of the Brookville (Ind.) Society of 
Natural History. 
Land Shells of the Hawaiian Islands, 
Mr. D. D. Baldwin, from the author. 
by 
