104 FORAMINIFERA 



Carboniferous to Recent. Living forms are most abundant 

 in cool or deep waters but are not confined to such habitats. 



Genus AMMOVERTELLA Cushman, 1928 



Plate 9, figures 11, 12 

 Genoholotype, Psammophis inversus Schellwien 



Ammovertella Cushman, Contr. Cushman Lab. Foram. Res., vol. 4, 1928, 



p. 8. 

 Psammojihis Schellwien, Palaeontographica, vol. 44, 1898, p. 266 (not 



BoiE, 1827). 



Test attached, consisting of proloculum and long tubular un- 

 branched second chamber increasing in diameter, the early por- 

 tion planispirally coiled, later and larger portion bending back 

 and forth progressing forward in one general direction; wall 

 arenaceous, usually with much cement; aperture formed by the 

 open end of the tube. 



Carboniferous to Jurassic. Europe and America. 



Genus AMMOLAGENA Eimer and Fickert, 1899 

 Plate 9, figures 17-19 



Genoholotype, Trochaimnina clavata Parker and Jones. 



Ammolagena Eimer and Fickert, Zeitschr. Wiss. Zool., vol. 65, 1899, p. 



673. 

 Trochammina (part) of authors. 

 Webbina (part) H. B. Brady, Proc. Roy. Soc. Edinburgh, vol. 11, 1862, 



p. 711 (not Webbina d'Orbigny, 1839). 

 Webbinella (part) Rhumbler, Arch. Prot., vol. 3, 1903, p. 228. 



Test attached, composed of an oval proloculum flattened on 

 the attached side and a second long undivided tubular chamber 

 of variable length but of nearly uniform diameter; wall with 

 a thin chitinous layer, showing especially on the attached surface 

 with an outer layer of finely arenaceous material with a large 

 proportion of ferruginous cement; aperture circular, at the 

 open end of the tube. 



Carboniferous to Recent. Living forms are most common in 

 fairly deep cold waters but are occasionally found in warmer 

 shallower waters in some numbers. 



The forms included in this family represent primitive tests 

 similar to those from which many of the multilocular forms of 



