TROPICAL PACIFIC FORAMINIFERA OF ALBATROSS 



45 



a generally quinqueloculine character; following these, chambers are 

 developed that fail to make the usual half coil, after which, in the 

 adult, chambers are developed generally in one plane but increasingly 

 shorter so that three or four make up a complete coil. Some of the 

 stages in this development are shown in the figures given here. 



Table 12. — Hauerina oradyi — material examined 



1 Key to abbreviations is given in Table 1. 



Genus SIGMOILINA Schlumberger, 1887 



Sigmoiiina Schlumberger, Bull. Soc. Zool. France, vol. 12, p. 118, 1S87. — 

 Cushman, Cushman Lab. Foram. Res. Spec. Publ. No. 1, p. 150, 1928; 

 U. S. Nat. Mus. Bull. 104, pt. 6, p. 48, 1929. 



Spiroloc-ulina (part) Costa (not d'Orbigny), Mem. Accad. Sci. Napoli, vol. 2, 

 p. 126, 1855 (1857). 



Planispirina (part) H. B. Brady (not Seguenza), Rep. Voy. Challenger, Zool- 

 ogy, vol. 9, p. 197, 1884. 



Genotype. — By designation, Planispirina sigmoidea H. B. Brady. 



Test with the early chambers quinqueloculine, later ones added in 

 planes slightly more than 180° from one another, making a continu- 

 ously revolving spiral, and in transverse section, producing a sigmoid 

 appearance ; aperture simple with a simple tooth ; exterior very often 

 with a superficial layer of arenaceous material. 



Tertiary and Recent. 



This genus very evidently developed from Quinqueloculina by the 

 addition of chambers in planes of more than 180°, so that the result- 

 ing section is S-shaped. 



The following species is the only one of this genus found in our 

 South Pacific material. 



SIGMOILINA EDWARDSI (Schlumberger) 



Plate 11, Figures 9 a-c 



Planispirina (Sigmoiiina) edicardsi Schlumberger., Bull. Soc. Zool. France, 

 vol. 12, p. 483 (113), pi. 7, figs. 15-18; fig. 8 (in test), 18S7. 



Sigmoiiina edicardsi Heron-Allen and Earland, Trans. Zool. Soc. London, 

 vol. 20, pt. 2, p. 584, pi. 45, figs. 19-21, 1915.— Sidebottom, Journ. Roy. Micr. 

 Soc, 1918, p. 9. — Heron-Allen and Earland, Bull. Soc. Sci. Hist. Nat. Corse, 

 1922, p. 123 ; British Antarctic Exped., Zoology, vol. 6, p. 71, 1922 ; Trans. 

 Zool. Soc. London, vol. 22, pt. 1, p. 69 (list), 1926. 



