292 Geological Society. 



(iii) Foraminifera, Ostracoda, and Parasitic Funjri from 

 the Ivainozoic Limestones of Cyrenaica. i»y Piederick 

 Chapman, A.L.S., F.R.M.S. 



This paper describes the foraminifera, ostracoda, and a parasitic 

 fungus found in the limestones of Cyrenaica. The foraminifera 

 are mainly from the Middle Eocene ; others belong to the Upper 

 Eocene, and to the Aquitanian or Stampian. The most abundant 

 foraminifer is Nummidites gizehensis, which is represented in the 

 Derna Limestones by its typical form, and is there associated with 

 the typical form and a new variety of N. curvisp'ira. At a higher 

 horizon below Ain Sciahat and in the Slonta Downs is a nummu- 

 litic limestone containing N. gizehensis, var. hjelli. 



Some limestones at Wadi Umzigga contain Lepidocyclina ele- 

 phantina, and are referred to the Aquitaniau or Stampian. 



Further details are given of the structure of Orthojyhragmina 

 jvatti. A new species of LoxoconcJia is described. The boring 

 fungus Palceachgla perforans occurs perforating Lepidocydina. 



(iv) The Fossil Echinoidea of Cyrenaica. By John Walter 

 Gregory, D.Sc, F.li.S., F.G.S. 



The Echinoidea collected in the journey across Cyrenaica are 

 referred to ten species, of which two are new and one is a new 

 variety. The echinoids come from four horizons : the oldest fauna 

 belongs to the Middle Eocene ; the Upper Eocene or Priabonian 

 fauna is represented by an unusually early species of yimjihiope, 

 and by an Eilunolamptas which is widely distributed through the 

 country and is referred to the Priabonian E. chenchennsis Gauth. 

 Some echinoids from the Cyrene Limestones are of Aquitanian 

 affinities, and others seen in the limestone east of Benghazi are 

 Miocene. The airinities of Uypsochjpeus hemisjjhericus (Greg.) 

 are considered. The echinoid faunas show that the Eocene rocks 

 containing them were, as a whole, deposited in a sea of moderate 

 depth. The Miocene strata were formed in comparatively shallow 

 water. 



(v) The Foraminiferal Limestones of Cyrenaica. By 

 David Paterson MacDonald, M.A., B.Sc. 



The microscopic examination of the limestones of Cyrenaica 

 shows that tiiey aro all mainly composed of organic material, and 

 are remarkably free from detrital material. The rocks were laid 

 down under conditions of quiet sedimentation. Some of them 

 have been partly dolomitized. The chalky limestones near the 

 base of the series have been deposited at the greatest depth. The 

 commonest organisms present aro foraminifera, cchinoderms in- 

 cluding holothurian plates, mollusca, and calcareous alga^, which in 

 some specimens form more than half of the whole rock. Some of 

 the limestones are oolitic. 



