536 MR. H. B, TRISTRAM ON THE TERRESTRIAL [June 27, 
51. Hexurx wtieata, Mill. 
In the Lebanon. 
52. Hewix soxipa, Ziegl. 
Between Nablous and the Jordan. 
53. Hexrx pacuya, Bourg. 
Near the Lake of Gennesaret, and north of Beyrout. 
54, Hetix ENGADDENSIS, Bourg. 
In the wilderness of Judzea. 
These six species appear to me to be very closely allied, the most 
important differences being in the aperture, which is almost circular 
in H. cavata (a species closely allied to H. figulina), and is oval and 
elongated in H. prasinata and H. engaddensis. The differences in 
size and colour are certainly very great; yet I am inclined to believe 
that they are attributable rather to climate and locality, and that 
further research will embrace all in two or at most three species. 
In the immense series we collected, it is difficult anywhere to draw 
a satisfactory line. 
55. Hewix verRmMicutaTA, Mill. 
A dwarf form of this widely spread and variable shell occurs be- 
tween Beyrout and Tripoli. In Northern Syria it is as large as in 
North Africa. 
56. Butimus acutvs, Drap. 
Common on the sandy banks near the shore between Beyrout and 
Sidon; scarcer to the southward. 
57. BuLimus DECOLLATUS, Brug. 
Found by us sparingly in the plain of Sharon. This is, so far as 
I am aware, the most eastern locality hitherto noticed for this shell. 
I cannot altogether agree with the remark of Bourguinat, that B. 
decollatus does not vary in the east and west, excepting in size, those 
from the east being considerably larger than from the west. I pos- 
sess an extensive series collected by myself in every country border- 
ing on the Mediterranean, from Spain and Morocco to Asia Minor, 
Cyprus, and Syria. The specimens from Algeria and Tunis are very 
much larger than any on the northern side, reaching the length of 
2} inches without the rejected portion of the apex. The Spanish 
specimens are much more obtuse, and with fewer whorls, than those 
from countries further east; and the further we proceed eastward, 
the longer and the more attenuated do we find the shell, till in Cy- 
prus and Palestine it reaches its extreme attenuation, though not 
approaching African specimens in size. It does not appear to occur 
in Egypt. 
58. BuLimus FAscio.atvs, Oliv. (var. eburnea). 
Scarce, in the neighbourhood of the Wady Kelt, near Jericho. 
