io EARLY TERTIARY OSTRACODA 



is near the northern end of the Sor Range syncline, which is the major structural 

 feature of the Sor Range-Danghari coalfield. " (Reinemund, personal communi- 

 ication 1966). 



Dr. F. T. Banner of University College, Swansea, was kind enough to examine 

 smaller foraminifera from sample 460-i. He has dated this horizon as the Upper 

 Palaeocene (pseudomenardii Zone). 



IV. SYSTEMATIC DESCRIPTIONS 



Subclass OSTRACODA Latreille 1806 



Order PODOCOPIDA Muller 1896 



Suborder PODOCOPINA Sars 1866 



Superfamily CYTHERACEA Baird 1850 



Family TRACHYLEBERIDIDAE Sylvester-Bradley 1948 



Diagnosis. Cytheracea with heavily calcified carapace, often highly ornamented 

 with more or less conspicuous eye-tubercle. Muscle scar pattern basically consisting 

 of four adductor scars (one or more vertically divided in some genera) with a 

 frontal scar which may be simple, V-Shaped, U-shaped or multiple. Posterior 

 characteristically sub-triangular or auricular, but in some genera produced to form a 

 caudal process. Subcentral-tubercle present or absent. 



Remarks. The classification adopted here is to retain the trachyleberids and the 

 hemicytherids in the family Trachyleberididae. Although in general trachyleberids 

 possess a subcentral-tubercle and a V-shaped frontal scar whilst hemicytherids 

 possess divided frontal and adductor scars, an auricular posterior end but lack the 

 subcentral-tubercle there still remain a large number of genera which tend to overlap, 

 thus making it impossible to clearly define the groups at the present time. Hazel 

 (1967) identified two families, the Trachyleberididae having six podomeres in the 

 antennule and the Hemicytheridae with five podomeres. This morphological 

 character is useless palaeontologically and considering the number of trachyleberids 

 which share hemicytherid characters (e.g. divided frontal scars) and hemicytherids 

 having a subcentral-tubercle it would appear optimistic to expect the number of 

 podomeres in the antennule to be so unique as to be restricted to only one group when 

 other, equally good morphological characters obviously are not. 



Pokorny (1964) considered*the Hemicytherinae to be a group having a horizontal 

 classification, and the situation at the present time has not been effectively clarified. 



Genus ACTINOCYTHEREIS Puri 1953 

 Type species. Cythere exanthemata Ulrich and Bassler 1904 



Actinocythereis ? quasibathonica sp. nov. 

 (Plate 1, figs. 1-3, 6, 7, 10-13) 



Derivation of name. Latin quasibathonica, " simulating Bathonian " ; with 

 reference to the resemblance to the Middle Jurassic (Bathonian) genus Oligocythereis. 



