542 MR. H. B. TRISTRAM ON THE TERRESTRIAL [June 27, 
brown colour, and the inside of the mouth a pale purple. It may 
be hereafter separated as a distinct species. 
Var. C, from the waters of Merom and the Lake of Galilee, is 
very large, almost approaching the specimens of Engedi in size, but 
black, more inflated and obtuse, and with a rich deep purple colour 
inside the mouth. Those from the Kishon are similar, but smaller. 
102. MELANOPSIS AMMONIS, 0. Sp. 
T. oblonga, nitida, nigrescens vel fusco-cornea, apice acuto, raro 
eroso ; anfract. 7-9, planis, regulariter crescentibus, non gra- 
datis, levibus ; costis vel striis indistinctis et interdum obso- 
letis sculpta; apertura ovali ; perist. simplici, acuto; callo 
albo, effuso ; columella albida et inflexa. 
Long. 25, diam. 10; apert. long. 7, larg. 5 mill. 
I was at first inclined to place this shell as a variety of M. pre- 
rosa; but its more elegant and elongated shape, the smallness of its 
mouth, and the traces of longitudinal ridges appear to me sufficient 
to justify its separation. Found only in streams at Heshbon and 
Ammon, east of Jordan, where the other species does not occur. 
103. Me.anopsis sautcyi, Bourg. 
In a few restricted localities; chiefly at Ain Sultan, Jericho. 
104. MreLanopsis CoOsTELLATA, Fer. 
In the Kishon. The differences between this and the preceding 
are clearly pointed out by Bourguinat. This species is less fusiform, 
more inflated, does not increase regularly, and its last whorl is three 
times the size of the others united ; while that of M. saulcyi is not 
more than once and a half as large. 
105. Mrxanopsis costaTA, Oliv. 
Very abundant in the Huleh (waters of Merom), the Lake of Ga- 
lilee, and the Upper Jordan. In immense quantities in a subfossil 
state round the Dead Sea. 
106. Mrexanopsis soRDANICA, Roth. 
Peculiar, so far as we could ascertain, to the Lake of Galilee and 
the Jordan below it. 
Rossmissler, 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. M. 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 M. jordanica to the north of it. 
107. MELANOPSIS EREMITA, 0. sp. 
T. fusiformis, semipellucida, elongato-pyramidalis, nitida, resplen- 
dens, vitreo-cornea, longitudinaliter trregulariter sed delica- 
