48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ']'] 



large open passages and bounded by solid walls. There are no hollow 

 pillars and no foramina except those on the outer walls of the super- 

 ficial chambers. 



Family 9. NUMMULITIDAE 



Test calcareous, perforate, the chambers usually numerous, arranged 

 in a spiral, either umbilicate or completely involute, surface variously 

 ornamented ; chamber walls in the higher forms with secondary canal 

 system. 



Subfamily i. FUSULININAE 



Test fusiform or subglobular, chambers extending from pole to 

 pole, each convolution completely covering the preceding whorls, wall 

 finely perforate; aperture an elongated slit or series of pores at the 

 base of the last- formed chamber. 



Genus SCHWAGERINA Moller, 1887 



Test subspherical, chambers divided into chamberlets by simple, 

 straight, secondary septse; aperture a single opening or series 

 of pores. 



Genus FUSULINA Fischer, 1829 



Test fusiform or subglobular ; chambers not completely subdivided ; 

 aperture simple. 



Subfamily 2. POLYSTOMELLINAE 



Test bilaterally symmetrical ; nautiloid, higher forms with a sup- 

 plemental skeleton and secondary canal system. 



Genus NONIONINA d'Orbigny, 1826 

 Plate 13, fig. 2 



Test composed of numerous chambers arranged to form a bilateral, 

 planospiral coil, the last formed volution usually embracing all the pre- 

 ceding ones ; walls usually smooth, sometimes pitted, very finely per- 

 forated ; aperture a narrow opening or row of openings at the base of 

 the apertural face between it and the preceding volution. 



Genus POLYSTOMELLA Lamarck, 1822 



Plate 13, fig. 3 



Test composed of numerous chambers, arranged in a regular, 

 bilaterally symmetrical, involute spire, the chambers extending back 



