670 PEOF. J. W GREGOKY ON [Nov. I9H, 



Dimensions in millimetres. — The following list shows the 

 range of variation in shape and size : — 



Var. a. 



Length. Breadth. Height. 



Cy 60. Labruk 56 52 25 



„ 58 54 24 



131. East of Wadi Gliarib 49 45 23 



229a. East of Slonta 51*5 50'5 22-5 



229c. Do. do ? 50? 22 



284. South of Wadi Firyah 53 50'5 23 



295. Slonta 60 55 25 



267. Wadi Firyah 51 45 ?24 



279. Do. do ?59 56 25 



291. North of Roman Camp, 



north-west of Slonta ? 54 27 



Var. o. 



144 59 57 21-5 



279 56 51 V23 



60 .. 57 52 22 



217 55 51 21 



E. falloti Cotteau ... l^ f 5 |J 



Var. c. 



82 ?57 50 28 



74 60 ?50 25 



264 55 51 285 



E. perrieri de Loriol . 52/56 82 % 42/45 % 



Do. Cotteau... 62 55 = 89% 28=45% 



E. zignoi Opp 49 84 % 43 % 



Var. d. 



151 59 57 30-5 



221 47 46 23, 



229 56 51? 29 



2296 55? 52 265 



295« 55? 49 28 



Dr. Oppenheim's f 53 45 27 L: has 2:1 



hydrocepha his \ 77 64 34 L : h as 7 : 3 



Distribution. — Upper Eocene : characteristically Priabonian in 

 Tunisia, in the Wadi Cherichera, G. Gebil (Djebil), Gebel Nasser, 

 Allah, Gebel Batene and Wadi Bogal, etc. • in Northern Italy at 

 Lonigo, Possagno, etc. 



?Bartonian : beds with Nummulites ficliteli, east of Siwa. 



Cyrenaica : in the Slonta Limestone. 



Var. a at Labruk, east of Wadi Gharib (the westernmost locality 

 at which Echinolampas was found) ; Messa ; Wadi Firyah ; and 

 between Wadi Firyah and the shrine of Sidi Mahomet Mahridi, 

 east of Slonta ; north of the Homan Camp, north-west of Slonta. 



Var. b at Wadi Jeraib, east of Gasr el Migdum (Cy 144) ; 

 Labruk (Cy 60) ; Wadi Firyah (Cy 279); Bir Hu, 5 miles south of 

 Cyrene ; 2 miles south-east of Messa (Cy 217). 



Var. c : Ain Sciahat. 



