116 Annals of the South African Museum. 



Fam. CYTHEBIDAE. 



GENUS CYTHEKE, Miiller. 



CY.THEKE POSTCULTBATA, sp. nov. 



(Plate XV, figs. 18, 6.) 



Description. Valve subrhomboidal, rounded in front, tapering 

 behind to the acuminate extremity; dorsal edge straight, ventral 

 obliquely truncated. Surface higher at the post-ventral region, and 

 sloping away to the front and dorsal border. Near the ventral edge 

 in the posterior region is a keel-shaped prominence curving inwards 

 and merging into the surface about the middle of the ventral edge of 

 the valve. Surface relieved with a few irregularly disposed pittings. 



Dimensions. Length, '527 mm.; height, '3 mm.; depth of valve 



08 mm. 



Relationships. There appear to be no closely related forms, either 

 fossil or recent, with the exception of Dr. G. S. Brady's " Challenger" 

 species, Cythere cytheropteroides* a form dredged at 150 fathoms from 

 the Cape of Good Hope. The present species, however, is more pyri- 

 form in outline. 



SUMMARY OF EESULTS. 



Upper Quarry. 



The meagre series of Foraniinifera obtained from this locality does 

 not afford any data which can be used to decide the age of the deposit. 

 The genera found, viz. MiUolina, Textularia, Anomalina, and Pulvinu- 

 lina, are all widely distributed at the present day, and the species, 

 where they could be determined, denote moderately shallow water con- 

 ditions. Further than this, they are components of similar faunas as 

 far back as the Cretaceous and even earlier Mesozoic strata. In thin 

 sections the particular types of polyzoa appear to indicate a relationship 

 to the like fauna of the Lower Quarry. 



Loiver Quarry. 



The following list of species of Foramiuifera and Ostracoda throws 

 a decided light on the age of this bed. 

 Foraniinifera : 



Haplophragmiiim neocomianum, Chapm. 

 Spiropleda anceps, Eeuss sp. 



* Eep. ChalL, vol. i, Zool., pt. iii, Ostracoda, 1880, p. 78, pi. xv, figs. 5a-d. 



