278 FORAMINIFERA 



Discorbina (part) Parker and Jones, Phil. Trans., vol. 155, 1865, pp. 

 385, 421. 



Test trochoid, the dorsal side with regular chambers, the 

 ventral side with supplementary chambers or alar projections 

 toward the umbilicus which is covered ; wall calcareous, finely 

 perforate; apertures on the ventral side at the periphery of the 

 secondary chambers and supplementary apertures on the dorsal 

 side at the inner edge of the chamber along the suture between 

 it and the preceding chamber, narrow and elongate. 



Eocene to Recent. 



Genus SIPHONINA Reuss, 1849 



Plate 40, figures 7, 8; plate 41, figure 11 

 Genoholotype, Siphonina firnbriata Reuss 



Siphonina Reuss, Denkschr. k. Akad. Wiss. Wien, vol. 1, 1850, p. 372. 



Rotalia (part) Czjzek (not Lamarck). 



Planorbulina (part) Parker and Jones, 1865 (not d'Orbigny). 



Trmicatulina (part) of authors. 



Test trochoid, biconvex, umbilical region typically closed ; 

 wall calcareous, coarsely perforate; aperture just ventral to the 

 periphery, elliptical, with the long axis parallel to the periphery, 

 in fully developed species with a short neck and phialine lip. 



Cretaceous to Recent. 



See Cushman, Foraminifera of the Genus Siphonina and 

 Related Genera (Proc. U. S. Nat. Mus., vol. 72, Art. 20, 1927, 

 pp. 1-15, pis. 1-4). 



Genus SIPHONINOIDES Cushman, 1927 



Plate 40, figures 11-13; plate 41, figure 12 

 Genoholotype, Planorbulina echinata H. B. Brady 

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



p. 77. 

 Planorbulina H. B. Brady, 1879 (not d'Orbigny). 

 Truncatulina of authors (not d'Orbigny). 

 Siphonina (pai't) of authors (not Reuss). 



Test in the adult generally globular; chambers irregularly 

 trochoid, becoming strongly involute in the adult; wall cal- 

 careous, perforate ; aperture circular, with a very short neck and 

 flaring lip. 



Tertiary and Recent. 



