C03MI0DISCUS. 



521 



GENUS 184. COSMIODISCUS GREV., 1866. 



Valve with hyaline margin, puncta 

 arranged in radiating rows, interrupted 

 at various points by hyaline rays ; 

 centre with scattered puncta. 



This genus, which was included in the 

 Fig. vj^Comiodiscus tenuis. Coscinodiscus by Rattray, deserves in my 



opinion to be preserved. The hyaline margin and its rays, equally hyaline and 

 distant, easily determines the species which ought to he included in it. 



The figure in the text is that of C. tenuis Grun., which is found fossil in 

 the Monterey deposit. 



GENUS 185. -ANISODISCUS GRUN., 1886. 



=9 



Fig. 275. Anisodiscus Pantocsekii. 



Valves circular, furnished with a margin of small distant spines, 

 difficult to see. The two valves dissimilar ; the superior, with rows 

 of puncta in distant lines, alternately short and long, the inferior 

 valve with puncta in approximate lines of equal length. 



This genus only includes a single species, A. Pantocsekii Grim., found in 

 a fossil state in Hungary, the figure of which is reproduced after Grunow 



(fig- 2 75)- 



