FAMILY 4. SACCAMMINIDAE 77 



base flat, dorsal side convex; wall chitinous; aperture circular, 

 in the middle of the ventral face. 



Oligocene, (Rupelton), Mainz Basin, Germany; Northern 

 Italy; France. 



Genus AMMOSPHAEROIDES Cushman, 1910 

 Plate 4, figure 15 



Genoholotype, Ammosphaeroides distoma Cushman 

 Arnmosphaeroides Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 51. 



Test free, consisting of an elongate or subspherical chamber ; 

 wall finely arenaceous with a large portion of reddish-brown 

 cement; aperture typically double, at the end of short tubular 

 portions of the test. 



Recent. Sea of Okohotsk, 82 fathoms. 



Genus THURAMMINA H. B. Brady, 1879 



Plate 4, figures 16-18 



Genoholotype, Thurammina papillata H. B. Brady 



Thurammina H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 45. 



Thyrammina Rhumblek, Arch. Prot., vol. 3, 1903, p. 236. 



Lituola (part) W. B. Carpenter, The Microscope, ed. 5, 1875, p. 533. 



Test typically free, usually nearly spherical but in some species 

 compressed, chamber typically single and undivided ; wall thin, 

 of fine sand with more or less chitin ; apertures several to many 

 at the end of nipple-like protuberances of the surface, occa- 

 sionally wanting. 



Carboniferous to Recent. Most abundant in deep cold water, 

 but at least one species in depths as shallow as 26 fathoms in the 

 Gulf of Mexico. 



Certain specimens seem to indicate that some of the forms 

 assigned to this genus may degenerate from multilocular ones. 



Subfamily 3. Pelosininae 



Test free; wall typically of matted spicules and fine amor- 

 phous material ; aperture usually single. 



