15 (J 2) Wall is finely agglutinated, thin, test consists of a tapering tube; surface fine 

 grained, creased by transverse wrinkles. Length 0.35-0.55 mm. a, Exterior; 

 b, top view; c, section Hippocrepina indivisa 



xioo 



16 (75) Neck is distinct from the main body of the test; wail consists of a mixture of fine 



and coarse grains. Length 0.42-0.65 mm Saccammina difflugiformis forma typica 



16 (15) Neck tapers to the apertural opening; wall consists of relatively large grains, 

 smoothly finished by the addition of finer grains in the interstices. Length 0.60- 

 0.80 mm Saccammina difflugiformis forma atlantica 



X50 



X50 



1 7 (13) Test is rigid, relatively large; wall thin, consists of a mixture of coarse and fine sand 

 grains, both exterior and interior surfaces rough. Length indeterminate because speci- 

 mens are fragmentary; diameter about 0.80 mm Rhabdamminal sp. 



X20 



17 (13) Test is collapsible; wall consists mostly of mud with the addition of minor amounts of 

 coarse grains or shell fragments. Length as much as 3 mm or more; diameter 0.4 mm or 

 ™ore Pelosina cylindrica 



X25 



