28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. '^'J 



Genus LITUOTUBA Rhumbler, 1895 

 Plate 4, fig. 2 



Test of two distinct parts, an early close-coiled portion and a long 

 tubular uncoiled later portion ; wall arenaceous, with an excess of 

 cement, either indistinctly or irregularly divided. 



Genus AMMOBACULITES Cushman, 1910 

 Plate 4, fig. 3 



Test free, composed of several chambers, early portion close 

 coiled in a single plane, later portion uncoiled and made up of a more 

 or less linear series of chambers ; wall coarsely arenaceous, usually 

 rather thick ; aperture single at the distal end of the last formed 

 chamber in the adult uncoiled specimen, but in the young usually at 

 the base of the apertural face. 



Genus HAPLOPHRAGMIUM Reuss, i860 



Test in the early portion close coiled, planospiral, later becoming 

 uncoiled and straight ; chambers distinct, not labyrinthic ; wall arena- 

 ceous ; aperture in the adult consisting of a number of pores, the 

 apertural face often becoming sieve-like. 



Genus LITUOLA Lamarck, 1804 



Plate 4, fig. 4 



Test crozier-shaped, the early portion planospiral, the later portion 

 uncoiled and straight, test arenaceous, the chambers labyrinthic with 

 radial vertical partitions and secondary septse; aperture typically of 

 several pores. 



Genus PLACOPSILINA d'Orbigny, 1850 



Test attached, composed of numerous chambers, the early portion 

 close-coiled, later portions uncoiling and spreading out in an irregular 

 but in general a linear series of chambers, building no floor ; last 

 portion of the test may be entirely free, made up of an irregular series 

 of chambers ; wall coarsely arenaceous, aperture rounded, at the end 

 of the last-formed chamber. 



Genus ROTALIAMMINA Cushman, 1925 



Test rotaliform, attached by the ventral side, all chambers visible 

 from above, only those of the last-formed coil from below, chambers 

 numerous with thick arenaceous walls of matted spicules, the areas 

 between softer and somewhat flexible; aperture ventral, along the 

 growing edge of the test. 



