LEPIDODISCUS. 



499 



Fig. 242. 

 Lepidodiscus elegans. 



GENUS 162. LEPIDODISCUS WITT, 1885. 



Valve capuliform, with 

 elevated margin, then 

 abruptly concave and after- 

 wards again slightly eleva- 

 ted near the centre. 

 Margins showing numer- 

 ous narrow septiform de- 

 pressions, elevated portions 

 resembling scales, central 

 portion showing, according 

 to different focussings, 

 sometimes coarse granules, 

 sometimes numerous rays 

 varying in number and 

 coarseness. 

 This genus only comprehends a single species, excessively curious and 



very rare L. elegans Witt. (fig. 242), found at Archangelsk by Dr. O. N. 



Witt and in Ananino deposit by Dr. Pantocsek. 



WITTIA PANT., 

 1889. 



Valve similar to that 

 of Lepidodiscus from 

 which it principally 

 differs by the striae 

 radiant, flame-like, very 

 finely punctate, oc- 

 cupying the whole 

 median portion of the 

 valve, and by the 

 centre being finely 

 punctate, separated 

 from the median por- 

 tion by a hyaline circle. 



A single species. 



Fig. 243. Wittia insignis. 



