52 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 'jj 



proloculum, followed by the typical Cornuspira-Vike second chamber, 

 in turn followed by several chambers gradually becoming shorter, 

 those of the adult being less than a half coil in length, usually three 

 or four necessary to make a complete coil. 



Genus Vertebralina d'Orbigny, 1826 



Plate 14, fig. 3 



Test with the early chambers planospiral, at least from external 

 appearances, later ones becoming rectilinear ; wall porcellanous, imper- 

 forate, usually ornamented by striations or costee ; aperture a long 

 narrow slit either at the outer end of the chamber or somewhat 

 laterally placed ; typically with a definite lip. 



Genus NODOBACULARIA Rhumbler, 1895 

 Plate 14, fig. 4 



Test composed of a proloculum and second Cornuspira-like cham- 

 ber, usually directly followed by a linear series of subcylindrical 

 chambers ; test imperforate, calcareous. 



Genus NUBECULARIA Defrance, 1825 

 Plate 14, fig. 5 



Test typically coiled, planospiral, free or attached, consisting of an 

 oval proloculum and second Cornuspira-Uke chamber of variable 

 length, followed by several chambers irregular in shape and arrange- 

 ment, but usually more or less distinctly planospiral, apertures one or 

 more, irregularly arranged, wall smooth, roughened, or with incor- 

 porated sand grains. 



Subfamily 2. QUINQUELOCULININAE 



Test in the adult or in the early development of the test, at least in 

 the microspheric form with the chambers a half coil in length and 

 added in planes 144° from one another, five planes being necessary 

 to complete a cycle before a new chamber is added directly above 

 one of the previous ones, aperture at this stage at least alternately 

 at opposite poles of the test. 



Genus QUINQUELOCULINA d'Orbigny, 1826 

 Plate 14, fig. 6 



Test in the young with the usually oval proloculum and short, 

 Cornuspira-like second chamber, followed by the adult character both 



