33 (32) Test is minute, narrow but thick, of nearly equal breadth throughout. Length about 



0.30 mm Spiroplectammina biformis 



X150 



X120 



33 (32) Test is compressed, somewhat tapering. Length about 0.42 mm Spiroplectammina typica 



X75 



34 (32) Test is thick; chambers are in a plane, sutures are generally horizontal. Length 0.40- ^3 



0.50 mm Textularia earlandi 



34 (32) Test is minute, delicate, compressed; chambers are in a warped plane, as if the test were 

 twisted around its elongate axis; sutures generally slanting at about 45°. Length about 0.30 

 mm. a. Side view; b, top view Textularia torquata 



35 (20) Coiling is milioline; wall is finely arenaceous, smoothly finished, siliceous, hence insoluble in hydrochloric acid 36 



35 (20) Coiling is spiral 37 



14 



