16 BULLETIN 10 4, UNITED STATES NATIONAL MUSEUM 



Genus CASSIDULINOIDES Cushman, 1927 



Bull. 104, pt. 3, p. 132 {Cassidulina parTceriana H. B. Brady). 



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. 



Genus EHRENBERGINA Reuss, 1850 



Bull. 104, pt. 3, pp. 133-137. 



Family 38. CHILOSTOMELLIDAE 



Test in the early stages of the simpler genera typically trochoid, 

 the chambers all visible from the dorsal side, only those of the last- 

 formed chamber visible from the ventral side, the chambers in later 

 development variously arranged, typically planispiral and involute 

 so that the early stages are completely covered; wall calcareous, 

 perforate; aperture typically on the ventral side, at least in the early 

 stages, in the planispiral forms becoming median. 



Subfamily 1. Allomorphininae 



Test in the adult with usually three chambers to a whorl, the 

 chambers inflated and enlarging rapidly as added; aperture, an elon- 

 gate, curved slit at the ventral border of the last-formed chamber. 



Genus ALLOMORPHINA Reuss, 1850 



Bull. 104, pt. 5, pp. 3,4. 



Subfamily 2. Chilostomellinae 



Test in the adult with two chambers making up a coil, the chambers 

 inflated and enlarging rapidly as added; apertiire variously modified, 

 lateral or terminal. 



Genus CHILOSTOMELLA Reuss, 1850 



Bull. 104, pt. 5, pp. 1,2. 



Subfamily 3. Seabrookiinae 



Test with two chambers forming a coil but entirely embracing on 

 the ventral side, the aperture elliptical and terminal. 



Genus SEABROOKIA H. B. Brady, 1890 



Bull. 104, pt. 5, pp. 4, 5. 



