FORAMINIFERA OF THE ATLANTIC OCEAN 



127 



Dyocibicides biserialis — Material examined 



Genus CIBICIDELLA Cushman, 1927 



Cibicidella Cushmax, Contr. Cushman Lab. Foram. Res., vol. 3, 1927, p. 93; 



Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 323. 

 Truncatulina (part) of Authors. 

 Planorbulina (part) Egger, 1857 (not d'Orbigny). 



Genoholotype. — Truncatulina variabilis d'Orbigny. 



Test attached by the flattened dorsal side, in the early stages similar 

 to Cibicides, later chambers irregularly disposed; wall calcareous, 

 coarsely perforate; aperture in the early stages as in Cibicides, in 

 the adult, rounded, on the dorsal side with a short neck and distinct 

 lip. 



Recent. 



CIBICIDELLA VARIABIUS (d'Orbigny) 



Plate 24, figure 3 



Truncatulina variabilis d'Orbigny, in Barker Webb and Berthelot, Hist. 

 Nat. lies Canaries, 1839, vol. 2, pt. 2, "Foraminiferes," p. 135, pi. 2, fig. 

 29. 



The test in the early stages is apparently like Cibicides, but the 

 later chambers become much irregular and are uncoiled in an irregu- 

 larly linear series. 



There are many later records for this species, but with very few 

 exceptions no figures are given, and most of these show entirely differ- 

 ent things from that figured by d'Orbigny. The types were from the 

 Canaries. 



Genus CYCLOCIBICIDES Cushman, 1927 



Cyclocibicides Cushman, Contr. Cushman Lab. Foram. Res., vol. 3, 1927, 



p. 93; Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 323. 

 Planorbulina (part) of Authors. 

 Rotalia Jones and Parker, 1860 (not Lamarck). 

 Pulvinulina (part) of Authors. 

 Planopulvinulina (part) Schubert, Pal. Zeitschr., vol. 3, 1920, p. 153. 



