X50 



120 UI9) Test is rounded on the periphery. According to its environment, the species is highly variable in size, 

 thickness, number of chambers, prominence or absence of umbilical plug, presence or absence of limbation 

 or other ornamentation of sutures, a, b, c, Spiral, umbilical, and edge views of A. beccarii lepida, 

 characteristic of quiet, brackish water; diameter 0.25-0.30 mm. d, e, f. Spiral, umbilical, and edge views of 

 the form of A. beccarii that is characteristic of bays and inlets; diameter 0.22-0.40 mm. g, h, i. Spiral, um- 

 bilical, and edge views of the form of A. beccarii that is characteristic of surf- washed coasts; diameter 

 0.40-0.70 mm Ammonia beccarii (variant forms) 



120 (7/9) Test is angled and keeled on the periphery; umbilical plug is flat. Diameter about 0.35 mm. a. Spiral view; b, 



umbilical view; c, edge view Gavelinopsis praegeri 



39 



