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IX. A Monograph of the Ostracoda of the Antwerp Crag. By Gkorge Stewardsox 

 Brady, M.B., F.L.S., C.M.Z.S., Professor of Natural History in the University of 

 Durham College of Physical Science, Newcastle-upon-Tyne. 



Received April 19th, read May 15th, 1877. 



[Plates LXII. to LXIX.] 



After examining and carefully studying a very interesting collection of Ostracoda 

 from the neighbourhood of Antwerp, which has, with great courtesy, been submitted 

 to me by M. Ernest Vanden Broeck, I regret that I am unable to point to any facts of 

 distribution or grouping which can throw the slightest light upon the age or mutual 

 relations of the strata in which they occur. The general character of the collection is 

 about as different as well could be from that of the group described and figured by 

 Professor T. Rupert Jones in his ' Monograph of the Tertiary Entomostraca of England.' 

 Indeed, of the fifty species described in the present memoir, eight only enter into 

 Professor Jones's list — viz. Cythere woodiana, C. plicata, C. wetherellii, C. macropora, 

 C. scahropaimlosa, C. jonesii, Cytheridea pinguis, and C. miilleri ; and of these eight, 

 three (C. woodiana, wetherellii, and scabropapulosa) are of extremely rare occurrence in 

 M. Van den Broeck's collection. Under these circumstances it is obviously impossible, 

 in the present state of our knowledge, to institute any useful comparison between the 

 Tertiary Ostracoda of England and Holland. One noteworthy point in the collection, 

 however, is this — the entire absence of freshwater species. Prof. Jones's memoir 

 contains eight freshwater species from the Eocene and Pleistocene deposits of England ; 

 M. Bosquet's Monograph of the French and Belgian species, on the other hand, has 

 no freshwater species ; neither, to all appearance, have the smaller works of MM. Speyer 

 and Egger. In the case of the Antwerp specimens it would appear that the fauna was 

 deposited in water of a moderate depth, probably not less than 15 or 20 fathoms. 



In the following Table the number of asterisks roughly indicates the comparative 

 abundance of the difl'erent species : — one asterisk denoting scarcity ; two, moderate 

 quantity ; and three, the greatest abundance. 



VOL X. — PART vni. No. 1. — August 1st, 1?>1?>. 3f 



