27 (26) Test is only partly uncoiled, i.e., the later chambers reach back toward the initial coil; 

 test is compressed throughout; wall is coarsely arenaceous. Length as much as 1.90 mm, 

 breadth 0.55-0.70 mm, thickness 0.40-0.50 mm Ammotium cassis 



X60 



27 (26) Test has a coiled initial stage followed by a straight uniserial part 28 



XlOO 



28 (27) Test is cylindrical; uniserial chambers are low; sutures are horizontal and 



inconspicuous. Length 0.30-0.35 mm. a. Side view; b, top view Aminobaculites exiguus 



28 (27) Test is compressed; apertural end is contracted 29 



29 (28) Coiled part constitutes the major part of the test; sutures indistinct, not deeply 

 depressed. Length as much as 1.00 mm, width of coiled part about 0.60 mm. 

 a. Side view; b, top view Ammobaculites dilatatus 



X40 



29 (2S) Coiled part constitutes a minor part of the test; sutures distinct, slanting, depressed. 



Length 0.50-0.70 mm. a. Side view; b, top view Ammobaculites crassus 



12 



^ X60 



