240 FORAMINIFERA 



Genus NODOGENERINA Cushman, 1927 



Plate 33, figure 28; plate 34, figure 17 

 Genoholotype, Nodogenerina bradyi Cushman 



Nodofjenerina Cushman, Contr. Cushman Lab. Foram. Res., vol. 2, 1927, 



p. 79. 

 Sagrina (part) of authors. 



Test elongate, uniserial, straight, chambers increasing in size 

 as added, distinct, inflated ; sutures depressed ; wall calcareous, 

 finely perforate; aperture terminal, central, rounded, with a 

 cylindrical neck and phialine lip. 



Cretaceous to Recent. 



This family although there is a great variety of form in the 

 adult stages, especially of the more specialized forms, shows a 

 compact grouping. The diverse forms are connected by stages 

 showing the relationships. They were all derived from a plani- 

 spiral coiled ancestry of calcareous perforate type such as 

 Spirillina. In Heterohelix, the biserial portion is becoming the 

 adult character as it is in a few of the other genera which are 

 primitive ones in the family. On this biserial stage are built 

 the adult characters, broad low chambers becoming annular in 

 Pavonina, globular chambers, spiral in Pseudotextularia or in 

 a plane, in Plmioglobulina, or triserial in Eouvigerina and 

 Pseudouvigerina or finally uniserial in several of the genera 

 representing terminal forms on various lines of development. 

 There is no tooth in the aperture and apparently internal siphons 

 are lacking, two characters which in addition to the planispiral 

 beginning will distinguish these from the Buliminidae, and the 

 perforate calcareous test will separate them from the Textu- 

 lariidae which are arenaceous. 



For a more detailed discussion of the relationships in this 

 family, see Cushman, Phylogenetic Studies of the Foraminifera 

 (Amer. Journ. Sci., vol. 13, 1927, pp. 321-326) . 



FAMILY 30. HANTKENINIDAE 



Test planispiral, at least in the young, involute ; each chamber 

 with a long acicular spine ; wall calcareous, perforate or in some 

 species vesicular on the exterior; aperture, a high arched open- 

 ing often with basal lobes or divided. 



