292 Geological Society. 



(iii) Foraminifera, Ostracoda, and Parasitic Funpi from 

 the Xaiuozoic Limestones of Cyrenaica. Uy Frederick 

 Chapman, A.L.S., F.li.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 Nummulites gizeJiensis, which is represented in the 

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

 the typical form and a new variety of i\r, ciu-vispli-a. At a higher 

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

 litic limestone containing a\'. gizehensis, var. hjelli. 



Some limestones at Wadi Umzigga contain LepidocycUna ele- 

 pliantina, and are referred to the Aquitanian or Stampian, 



Further details are given of the structure of Ortliophragmina 

 jrratti. A new species of Loxoconcha is described. The boring 

 fungus Palceachgla perforans occurs perforating LepidocycUna. 



(iv) The Fossil Echinoidea of Cvrenaica. By John "Walter 

 Gregory, D.Sc, F.K.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 echiuoids come from four horizons : the oldest fauna 

 belongs to the Middle Eocene ; the Upper Eocene or Priaboniau 

 fauna is represented by an unusually early species o? Amphiope, 

 and by an Echinolampas which is widely distributed through the 

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

 Some echinoids from the Cyrene Limestones are of Aquitanian 

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

 Miocene. The ailinities of Hypsochipeus hemisphericus (Greg.) 

 are considered. The echinoid faunas show that the Eocene rocks 

 containing tliem 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 Patersou MacDonald, M.A., B.Sc. 



The microscopic examination of the limestones of Cyrenaica 

 shows that tliey are 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 beeu partly dolomitized. The chalky limestones near the 

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

 commonest organisms present are foraminifera, echinoderms in- 

 cluding holothuriun plates, niollusca, and calcareous algrc, which in 

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

 the limestones arc oolitic. 



