3 6 4 



LAMELLA. 



B. Rudimentary false septa reduced to knobs. 



GENUS 74. LAMELLA BRUN, 1894. 



Valves bacillar, dilated at the median 

 portion and at the apices ; the latter with 

 hyaline inflations. Girdle face showing 

 bosses (false rudimentary septa ?) clearly 

 displayed and very smooth. 



This genus has been proposed by Prof. Brun 

 for a fossil form found in Totata, Oamaru, New 

 Zealand, L. oculata Brun, which will be found 

 represented in the text. 



Fig. 116. 



Lamella oculata. 



COHORT OF SURIRELLINE^E. 



Tribe XVI. Surirelle^. 



Valves undulated transversely, undulations visible in the girdle face, striate, 



and showing several bands transversely shaded . . . Cymatopleura. 



' Valve elliptic, sometimes constricted in the middle, fur- 

 nished with a pseudo-raphe crossed at the median por- 

 tion and longly bifurcated at the longitudinal apices . Hydrosilicon. 



f Valves cuneate, furnished with costae and 



beads; valves flat, without alas . Podocystis. 



Valves not 



transversely 



undulate. 



j Valves flat or spirally torsive, furnished 

 Raphe not j with costas and moniliform striae, frus- 

 bifurcate. tules alate . . . Surirella. 



Valves saddle-shaped, with pseudo-raphe 



arranged in the two valves in the form 



[_ of a cross . 



Campy lodiscus. 



