5*2 



XANTHIOPYXIS. 



GENUS 175. XANTHIOPYXIS EHR, 1844. 





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Fig. 263. Xanthiopyxis umbonata. 



Valves entirely hyaline, circular, or elliptic, bristling with short 

 spines, robust and erect. 



This genus comprises a dozen curious species, all fossil. We give (fig. 

 263) X. umbonata Grev., found in the Monterey deposit. 



