98 



42b Keels eccentric to the median axis, directly opposite; 



frustules rectangular in cross section, transversely striate 

 or punctate, capitate ends, medianly constructed - HANTZSCHIA 



] 



Diagrammatic cross-section of Hantzschia , (7) 



Fig. 163. Hantzschia amphioxys , (5), cells 20-lOOu long, 5-10u wide; 

 carinal dots not elongate, 5-8 in lOu; 13-20 striae in 

 lOu. X 1000. In the southwest. 



valve view 



Notes : 



Fig. 164. Hantzschia virgata , (5), cells 20-150U long, 6-12u wide; 

 carinal dots elongate, k-6 in 10n; 9-15 striae in 10vi. 

 X 1000. 



TTfpTTrr-^rrrffTffTT? 



valve view 



Notes 



