290 FORAMINIFERA 



Genus CERATOBULIMINA Toula, 1920 

 Plate 43, figure 11; plate 46, figure 1 

 Genoholotype, Rotalina contraria Reuss 

 Ceratobulimina Toula, Jahrb. k. k. Geol. Reichs., vol. 64, 1920, p. 665. 

 Rotalina (part) Reuss, 1851 (not d'Orbigny). 

 Cassidulina (part) H. B. Brady, 1881 (not d'Orbigny). 

 Bidimina (part) of authors (not d'Orbigny). 

 Buliminella (part) Cushman, 1911. 



Pulvinulina (part) Rzehak, 1888 (not Parker and Jones). 

 Rotalia (part) Plummer, 1927 (not Lamarck). 



Test rotaliform, all chambers visible from the dorsal side, 

 only those of the last-formed whorl visible from the ventral side, 

 close coiled; chambers numerous, distinct; wall calcareous, 

 perforate, added to as growth progresses, laminated, the entire 

 exterior polished ; ventral side of the test with the umbilicus 

 open, the aperture extending into the ventral side of the last- 

 formed chamber and in perfect adult specimens the aperture 

 covered by a thin convex plate merged with the chamber wall 

 above the aperture in a semicircular line, the lower end thin, 

 lip-like. 



Upper Cretaceous to Recent. 



EXPLANATION OF PLATE 44 



Calcarinidae, Amphisteginidae, Cymbaloporettidae 

 Fig. 



1. Calcarhia spencjlerl (Linne). (After Carpenter), a, dorsal view; 



6, ventral \iew; c, edge view. 



2. Siderolites tetraedra (Giimbel). (After Carpenter). 



3. Baculogypsina sphaerulatns (Parker and Jones). (After Carpenter). 



a, exterior; b, section showing developmental stages. 



4. Asterigerina carinata d'Orbigny. (After d'Orbigny). a, dorsal view; 



b, ventral view; c, edge view. 



5. Amphistegina lessonii d'Orbigny. a, dorsal view; b, ventral view; c, 



edge view. 



6. Cymbaloporetfa sqiiammosa (d'Orbigny). a, side view; 6, ventral 



view. 



7. Cymbaloporella tabellaeformis (H. B. Brady). (After H. B. Brady). 



a, dorsal view; b, side view. 



8. Halkyardia minima (Liebus). (After Heron-Allen and Earland). 



a, dorsal view; b, ventral view. 



9. Tretomphalus btdloides (d'Orbigny). (After H. B. Brady), a, dorsal 



view; b, side view. 



