FAMILY 37. CASSIDULINIDAE 293 



Test close coiled, lenticular or subglobular, the chambers 

 alternating on the two sides of the periphery; wall calcareous, 

 perforate ; aperture elongate, close to the peripheral plane. 



Tertiary and Recent. 



See Cushman, Notes on the Genus Cassidulina (Contr. Cush- 

 man Lab. Foram. Res., vol. 1, 1925, pp. 51-60, pis. 8, 9). 



Genus CASSIDULINOIDES Cushman, 1927 



Plate 43, figures 17-19; plate 46, figure 4 



Genoholotype, Cassididina parkeriana H. B. Brady 

 Cassidulinoides CusHMAN, Contr. Cushman Lab. Foram. Res., vol. 3, 1927, 



p. 84. 

 Cassidulina (part) of authors. 



Test in the early stages like Cassidulina, but in the adult 

 becoming uncoiled in a series of alternating chambers ; aperture 

 in the young like Cassidulina, later becoming terminal. 



Miocene to Recent. 



Genus ORTHOPLECTA H. B. Brady, 1884 



Plate 43, figure 20; plate 46, figure 5 



Genoholotype, Cassidulina (Orthoplecta) clavata H. B. Brady 

 OHhoplecta H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 

 432. 



Test very elongate, subcylindrical ; chambers in an irregular 

 biserial arrangement in the adult, those of the young appearing 

 more as in Cassidulina; wall calcareous, perforate; aperture 

 nearly terminal. 



Recent. 



Subfamily 3. Ehrenbergininae 



Test in the early stages as in Cassidulina, but the chambers 

 soon becoming compressed in a plane at right angles to that of 

 the early coiling and becoming uncoiled ; aperture elongate, on 

 the ventral side near the periphery. 



