Vol. 67.] THE FOSSIL ECH1N01DKA OF CYRENAICA. 679 



EXPLANATION OF PLATES XLVII-XLIX. 



Plate XLVII. 



Fig. 1. Clypeaster biarritzensis Cott., var. trotteri, nov. Operculina Limestoue : 

 Aquitanian. Half a mile east of Ain Sciahat. Fig. la, the test 

 from above; fig. 1 b, the test from below ; both 8/9 nat. size. (Cy98.) 

 (See p. 662.) 



2. Amphiope duffi, sp. nov. Slonta Limestone: Priabonian. Near Ain 



Sciahat, Cyrene. Natural size. (See p. 667.) 



3. Amphiope duffi, sp. nov. Slonta Limestones at Sidi Eof Diasasia, 



south-east of Cyrene. Slightly reduced (37/40). (Cy 66.) 



4. Schizaster ederi, sp. nov. Operculina Limestone : Aquitanian. Ain 



Sciahat, Cyrene. Fig. 4 a, specimen from above ; fig. 4 b, from 

 below ; fig. 4 c, from the side ; natural size. (Cy 100.) (See p. 674.) 



Plate XLVIII. 



Fig. 1. Echinolampas cherichefensis Gauth. A specimen of var. a from Messa, 

 Fig. 1 a, seen from above, slightly reduced (57/59) ; fig. 1 b, the same 

 from the side, slightly enlarged. (Cy 281.) (See p. 669.) 



2. The lower surface of a specimen of var. b. Slonta Limestone: 



Priabonian. East of Messa. Slightly reduced (52/55). (Cy 217.) 



3. Sarsella lamberii sp. uov. Operculina Limestone : Aquitanian. Near 



Ain Sciahat, Cyrene. Fig. 3 a, specimen seen from above ; fig. 3 b, 

 from below ; slightly reduced (37/42). (Cy 274.) (See p. 675.) 



Plate XLIX. 



Fig. 1. Echinolampas chericherensis Gauth. A specimen of var. b from the 

 Wadi Jeraib, east of Gasr el Migdum. Fig. 1 a, the lower side 

 slightly reduced (55/57) ; fig. 1 b, the same from the side, slightly 

 enlarged. (Cy 144.) (See p. 670.) 



2. The uppermost surface of a specimen of var. a. Slonta Limestones. 



Slightly reduced (55/59). (Cy 295). (See p. 670.) 



3. Specimen of a varietv from the Wadi Firyah. Slightly reduced (41/47). 



(Cy 279.) (See p.'670.) 



Discussion. 



Br. 0. W. Andrews congratulated the Authors on this valuable 

 contribution to our knowledge of the geology of a little-explored 

 district, and remarked that the suggestion that Crete was con- 

 nected with the mainland in late Pliocene or early Pleistocene 

 times was supported by the discovery by Miss Bate, on that island, 

 of Elephas antiquus, a dwarf elephant (E. creticus), and a Hippo- 

 potamus near to H. pmilandi. 



Dr. Teall referred to the approximate horizontality of the Eocene 

 beds over large areas both in Cyrenaica and in Egypt, and to the 

 great difference of level of corresponding members of this formation 

 in the two regions. He asked Prof. Gregory whether he had formed 

 any opinion as to how this difference in level was to be accounted for. 

 Had the whole of the vast Egyptian area been lowered by faults of 

 the kind to which reference had been made ? He (the speaker) 

 thought that the paper was of great interest in connexion with the 

 tectonic features of the eastern half of the Mediterranean area. 



Mr. A. Wade said that he was glad that the paper furnished 

 another link connecting Egyptian geology with that of other 



