1 88 FAUNA AND FLORA OF PALESTINE. 



H. prasinala and //. cngaddcnsis. 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 

 of them in two or at most three species. In the immense series we col- 

 lected, it is difficult anywhere to draw a satisfactory line. 



77. Helix vcnnicidata. Miill. Verm. Terr, et Fluv. Hist, ii., p. 20. 



A dwarf form of this widely spread and variable shell occurs between 

 Beyrout and Tripoli. In Northern Syria it is as large as in North Africa. 



78. Bulinuts acittus. (Miill. Verm. Terr, et Fluv. Hist, ii., p. 100.) 



Common on the sandy banks near the shore between Beyrout and 

 Sidon ; scarcer to the southward. 



79. Buliiinis decollates. Linn. Syst. Nat. i., p. ']']},. 



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 possess an extensive 

 series collected by myself in every country bordering on the Mediterranean, 

 from Spain and Morocco to Asia Minor, Cyprus, and Syria. The speci- 

 mens from Algeria and Tunis are very much larger than any on the 

 northern side, reaching the length of 'i\ 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 Cyprus and Palestine it reaches its extreme attenuation, 

 though not approaching African specimens in size. It does not appear 

 to occur in Egypt. 



80. Bulivius fasciolatus. Oliv. Voy. Lev. i., p. 416, pi. 17, f. 5 

 (van cbiirneus). 



Scarce, in the neighbourhood of the Wady Kelt, near Jericho. 



81. Bidivms candelaris. Pfr. P. Z. S. 1846, p. 40. 

 Maritime Plains. 



