THE . CONCHOLOGISTS’ - EXCHANGE 5 
flated than the males. The two Southern forms, 
U. latecostatus and U. Eluotli seem to be 
closely allied but as the true zzdzlatus is 
found associated with them they are probably 
distinct. I have never found wdu/atus asso- 
ciated with plcatus. 
44.— Unio ventricosus, Barnes. 
This species is very common in the Missis- | 
sippi River, and it is one of our most showy 
and handsome Unios, the green rayed varieties 
especially so. In respect to its rays and the 
color of. its interior it is extremely variable; 
the nacre of some being bluish white, in others 
it is a beautiful pink varying to pale rose color, 
while in others still it is pale salmon. This 
shell is often found without rays and it is then 
difficult to separate from cafax. It seems to 
bea very active species and is found in both 
deep and shallow water, in the muddy bottoms 
of the sloughs and lakes as well as in the sand 
and gravel beds of the river. It attains an im- 
mense size and becomes very tumid with age. 
The females are very much more inflated pos- 
teriorly than the males. 
45.— Unio zig-zag, Lea. 
| sally. It is a ®very abundant species and is 
| found commonly in all our streams and 
sloughs. It attains an immense size in the 
river, being found there six inches in length 
| including its wing and from six to seven inches 
| wide. It is a very much depressed shell with 
| very small beaks and flattened umbones. Its 
| interior is usually white. The young speci- 
mens are very beautifully rayed and have a 
greenish brown epidermis and very prominent 
growth lines. Animal very active. 
Margaritana rugosa, Bares. 
47- 
Shell rugosely plicate. It is found rather 
sparingly here, and in the creeks only, and at- 
tains an immense size. I have specimens from 
Pope Creek seven inches wide and four inches 
long. It has a dark brown epidermis, which 
in the young specimens is greenish, with beau- 
tiful green rays. Nacre usually white but often 
found of a salmon color. The teeth of the 
adult shell are very large, often trifid. It is 
very constant in its specific characters and has 
a very wide geographical distribution. Animal 
slow in its movements. 
To be Continued. 
This beautiful little shell is rather common | 
in the river and sloughs. As before stated it 
is the female of U7. donactformis. Mr. Lea’s 
types of donaciformis came from Tennessee. 
IT have it from the Cumberland River and it | 
This | 
agrees with the male form found here. 
A CATALOGUE OF THE BULIMI- 
NI FOUND IN CENTRAL 
little shell is usually covered with beautiful — 
green zig-zag rays. 
umbones. It is usually bluish white within, 
but is found sometimes with a pink nacre. 
of low water. 
-Sub-Genus Margaritana, Schu- 
macker. 
46.—Margaritana complanata, Barnes. 
Shell slightly plicate and triangular in out- 
line, symphynote, and very much alated dor- 
The female is very much | 
inflated, very truncate, and has very angular | 
It 
is very active and is often found in consider- | 
able numbers in the course gravel and under | 
flat rocks near the margin of the river at times | 
eats _ ASIA. 
BY C. F, ANCEY, BERROUAGHIA, ALGERIA. 
The principal character of the molluscous 
| fauna of Central Asia, viz: Turkestan, Af- 
ghanistan, and Beluchistan, is the numerous 
species of Bulimini found there. A mono-_ 
graph of these has been published recently by 
myself in the “Bulletins de la Societe Mala- 
| cologique de France,”’ 1886. The following 
_ have been recorded in this monograph, a num- 
ber being new to science. Thibet is not in- 
cluded here. 
