34 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. JJ 



Genus BIFARINA Parker and Jones, 1872 



Test with the early chambers Hke Boliviua but in later develop- 

 ment becoming uniserial. 



Subfamily 3. VERNEUILININAE 



Test with the early chambers tri serial, in some genera later beci^m- 

 ing biserial or uniserial. 



Genus VERNEUILINA d'Orbigny, 1840 

 Plate 5, fig. 4 



Test free, more or less elongate, tapering, in cross section round or 

 triangular, composed of a series of chambers spirally arranged, but 

 in three vertical columns ; walls variable, arenaceous or hyaline ; aper- 

 ture a slit at or near the base of the inner margin of the chamber. 



Genus VALVULINA d'Orbigny, 1826 



Plate 5, fig- 5 



Test spiral, conical, with three chambers in a whorl, umbilicate, 

 usually attached ; wall arenaceous, fairly smooth ; aperture provided 

 with a valvular tooth ; color usually reddish-brown, area of fixation 

 white or light gray. 



Genus CHRYSALIDINA d'Orbigny, 1846 

 Plate 5, fig. 7 



Test many chambered, triserial, at least in the early portion, taper- 

 ing ; apertures numerous, scattered over the terminal wall of the 

 chamber ; other walls also porous. 



Genus TRITAXIA Reuss, i86o 



Plate 5, fig. 6 



Test triserial, at least in the earlier portion, usually triangular in 

 cross section ; aperture central and terminal with or without a dis- . 

 tinct neck and lip, rounded ; wall usually arenaceous. 



Genus GAUDRYINA d'Orbigny, 1839 



Plate 6, fig. I 



Test free, composed of two distinct portions, the earlier consisting 

 of a series of chambers arranged triserially, followed by a later 

 portion consisting of a series arranged biserially; wall arenaceous. 



