NO. 4 FORAMINIFERA CUSHMAN 4I 



Genus ALLOMORPHINA Reuss, 1850 

 Plate 7, fig. 7 



Test made up of a few ovate chambers in a coil, each chamber 

 making up 120° of the volution so that but three chambers are visible 

 from the exterior ; wall thin, translucent, finely punctate ; aperture a 

 narrow slit at the base of the chamber. 



Genus SEABROOKIA H. B. Brady, 1890 



Test composed of a series of chambers, each partially or entirely 

 inclosing the preceding one ; wall thin, hyaline, perforate ; aperture 

 terminal, rounded, with a slightly thickened lip. 



Genus ELLIPSOIDINA Seguenza, 1859 

 Test uniserial, each chamber added from the base of the preceding 

 one and entirely enclosing it ; aperture terminal with a projecting lip, 

 often connected interiorly by a tubular neck with the preceding 

 aperture. 



Family 7. GLOBIGERINIDAE 



Test composed of numerous chambers, usually much inflated, 

 arranged typically in a trochoid coil, but in some species becoming 

 planospiral ; often umbilicate ; wall calcareous and perforate, usually 

 with a more or less regular reticulation and in perfect specimens in 

 some species with long slender spines ; aperture either large and 

 simple or with numerous accessory openings. 



Genus GLOBIGERINA d'Orbigny, 1826 



Plate 8, fig. 7 



Test composed of numerous inflated chambers arranged typically 

 in a trochoid manner, but which in later development may be 

 variously arranged ; wall typically coarsely perforate, reticulate ; 

 aperture large, arched, at the base of the inner margin of the chamber, 

 in some species opening on the umbilicus, in others with numerous 

 accessory openings. 



Genus ORBULINA d'Orbigny, 1839 

 Plate 8, fig. 8 

 Test in the early stages composed of several G!obigcn>ia-\ike cham- 

 bers rapidly increasing in size as added, finally entirely stuTOunded 

 by the adult chamber which is spherical, with numerous small pores, 

 and one large circular orifice, or occasionally more than one ; wall 

 reticulated, in living condition with long, fine spines. 



