CAMPVLODISCUS. 



GENUS 79. CAMPYLODISCUS EHR, 1841. 



375 



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Fig. 122. 

 ( 'ampylodiscus parvulus. 



Fig. T2i. Campylodiscus Clypeus. 



Valves circular, furnished with costal 

 usually short. Frustules saddle-shaped, with 

 the median lines of the two valves thrown 

 across one another at right angles. 



The valve is perfectly circular, but it 

 appears to be irregularly circular in conse- 

 quence of its curvature. Endochrome as in 

 the Surirella. 



This genus was in great confusion, but Mr. J. Deby has set it in order by 

 the publication of his Prelude to a Monograph, under the title of " An 



