4 8 4 



MONOPSIS. 



Valves elliptic or rounded, furnished with two slight elevations, 

 very large, plain, or covered with radiating puncta. Valve with very 

 fine puncta, arranged in radiating rows, anastomosing. Central puncta 

 sometimes robust, scattered. 



The genus Pseudo-Cerataulus comprehends three fossil forms from Hungary. 

 In the text will be found P. Kinkeri Pant. (fig. 217), reproduced from one of 

 my photographs made from a type specimen that Dr. Pantocsek was good 



enough to forward me. 



GENUS 144. MONOPSIS, GROVE & STURT, 1887. 



Fig. 218. Monopsis mammosa. 



\ 



Valves circular, with centre depressed, margins slightly elevated. 

 A pseudo-ocellus or process, eccentric, round, covered with elongated 

 puncta arranged in radiating rows. Striae very delicate, finely 

 punctate, plumose, arranged in radiating flexed rows, arising from the 

 process. 



A single example, Monopsis mammoso Gr. and Sturt, having its origin in 

 he Oamaru deposit, and shown in the text (fig. 21S), after my photograph. 



