NO. 4 FORAMINIFERA CUSHMAN 39 



perforate ; aperture single, either radiate or surrounded with a lip 

 which is usually cut in a radial manner ; surface smooth or ornamented 

 with costse ; microspheric specimens with a coiled development in 

 the earlier chambers ; megalospheric specimens without the coiled 

 chambers as a rule. 



Subfamily 3. POLYMORPHININAE 



Test polythalamous ; chambers usually arranged in an irregular 

 spiral, in later growth sometimes approaching a biserial arrangement 

 or sometimes uniserial ; surface smooth or ornamented by spines or 

 cost?e ; aperture radiate. 



Genus POLYMORPHINA d'Orbigny, 1826 



Plate 7, fig. 8 



Test more or less rounded, usually not equilateral ; chambers few, 

 obliquely placed in a more or less spiral arrangement; aperture 

 terminal, radiate ; wall calcareous, perforate, either smooth or vari- 

 ously ornamented with spines, costas, or tubercles. 



Genus DIMORPHINA d'Orbigny, 1826 

 Test with the early chambers polymorphine, later ones uniserial. 



Subfamily 4. UVIGERININAE 



Test composed of several chambers, typically spirally arranged, 

 especially in the earlier portion, later chambers often becoming loosely 

 arranged, or even uniserial ; wall smooth or variously ornamented ; 

 aperture typically consisting of a neck with a definite phialine lip. 



Genus UVIGERINA d'Orbigny, 1826 



Plate 8, fig. 3 



Test elongate, spiral, consisting of numerous chambers, usually 

 arranged triserially, occasionally in later growth with fewer than 

 three chambers in each volution; wall calcareous, perforate, hyaline, 

 smooth or ornamented with spines or costse or modifications of them ; 

 aperture with usuallv a tubular neck at the end of which is a phialine 

 lip. 



