1865.] AND FLUVIATILE MOLLUSCA OF PALESTINE. 543 
tissime striolata; apice acuto, nunquam eroso; anfractibus 
6-8, planis, regulariter crescentibus; sutura parum impressa ; 
apertura ovalis ; peristomate, simplici, acuto ; callo albescente ; 
columella albida et inflexa. 
Long. 16, diam. 6} mill. ; apert. long. 5, lat. 33 mill. 
Collected only in the little stream of the Wady Um Bagkek, be- 
tween Sebbeh and Jebel Usdum, at the south-west corner of the 
Dead Sea, where it was very abundant. 
This beautiful and very small species of Melanopsis may be at once 
recognized by its peculiarly brilliant gloss. It may be remarked, 
that in the same region which supplies the smallest of its group, the 
common Melanopsis prerosa attains its greatest magnitude. 
108. NeriTIna sorDANT, Buttler. 
Found only in the Jordan and its two lakes, Huleh and Galilee; 
but chiefly under the leaves of water-lilies in the Huleh. We never 
discovered it living in the lower course of the Jordan. 
109. NeriTina micuoni, Bourg. 
Abundant in almost every stream and spring throughout the whole 
of Palestine, east and west, except in the Jordan and its lakes. It 
attains its greatest size in the thermal springs of the Ghor. 
110. Neririna BELLARDI, Mouss. 
Ihave not had the opportunity of examining a type specimen ; 
but, from the diagnosis, I believe this species to be that which is 
found in the Jabbok and its affluents. It is certainly different from 
N. michonii, as may be at once recognized by an examination of its 
operculum. 
111. Cyrena cor, Lam. 
Abundant in the Jordan and the Lakes of Huleh and Tiberias. 
In the latter it attains a very large size. 
112. Cyrena FLUviATILis, Mill. 
This species, if it be really distinct, is not uncommon in the J ordan. 
What is the Cyrena crassula of Mousson, found near Jaffa? 
113. Unto TERMINALIS, Bourg. 
This is the common Unio of the Lake of Galilee, and I found it 
also in the Litany (Leontes) River. The Unio jordanicus, Bourg., 
seems to be only a thinner and shorter variety of U. terminalis. 
I have obtained so many intermediate specimens that it appears to 
me impossible to separate the two. U. terminalis also seems to be 
identical with the U. dignatus, Lea, from the Tigris, as I find on 
comparison of type specimens in Mr. Cuming’s collection. 
114. Unto DELESSERTI, Bourg. 
In the Zerka or Crocodile River, in the plain of Sheron. Found 
by M. de Saulcy near Jaffa, in the same plain. 
