TERRESTRIAL AND FLU VI ATI LE MOLLUSC A. 199 



175. Mclanopsis costata. Oliv., Voy. ii., p. 294. 



Very abundant in the Huleh (waters of Merom), the Lake of Galilee, 

 and the Upper Jordan. In immense quantities in a sub-fossil state round 

 the Dead Sea. 



176. Alelanopsis jordanica. Roth. IMoIl. Spec, p. 25, pi. il., 

 f. 12, 13. 



Peculiar, so far as we could ascertain, to the Lake of Galilee and the 

 Jordan below it. 



Rossmassler, as well as Roth at an earlier period, considered this to be 

 a variety of the preceding species. There is, however, a striking difference, 

 not only in the shape and coloration, but in the habit of the living animal. 

 yJ/. costata is always found adhering to the stems and the under surface 

 of the leaves of aquatic plants ; while the obtuse and striped form, 

 M. jordanica, adheres only to rocks and stones. M. costata we never 

 met with south of the entrance to the Lake of Galilee in a living state, nor 

 J\I. Jordanica to the north of it. 



177. JMclanopsis ercmita. Tristram. P. Z. S., 1865, p. 542. 



Long. 16, diam. 6\ mill. ; apert. long. 5, lat. 3^ mill. 



Collected only in the little stream of the Wady Um Bagkek, between 

 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 Mclanopsis may be at once 

 recognised by its peculiarly brilliant gloss. It may be remarked, that in 

 the same region which supplies the smallest of its group, the common 

 Jllclanopsis pi'cerosa attains its greatest magnitude. 



Besides the species here enumerated, the following have been 

 named by Bourguinat, but no descriptions published. They are unknown 

 to me, and are : 



178. Mclanopsis prophctarnm. 



Elisha's Fountain. Beyrout. Lake of Antioch. 



179. Mclanopsis ovum. 

 Lake of Galilee. 



