FORAMINIFEEA OF THE ATLANTIC OCEAN 



49 



SIGMOILINA SCHLUMBERGERl Silvestri 



Plate 11, Figures 1-3 



Sigmoilina schlumbergeri Silvestri, Mem. Pont. Accad. Nuovi Lincei, vol. 

 22, 1904, p. 267.— Chapman, Journ. Linn. Soc. Zool., vol. 30, 1907, p. 21, 

 pi. 2, fig. 42; Subantarctic Islands of New Zealand, 1909, p. 323; Journ. 

 Linn. Soc. Zool., vol. 30, 1910, p. 398; Zool. Res. Endeavour, pt. 3, 1912, 

 p. 310; Biol. Res. Endeavour, vol. 3, pt. 1, 1915, p. 11. — Cushman, Bull. 

 100, U. S. Nat. Mus., vol. 4, 1921, p. 449. 



I have given above the principal references to these two species. 

 The figure given by Costa is Hke so many of his, apparently poorly 

 drawn as to details. According to Silvestri, Costa's type is not the 

 same as the form figured by Brady which is the common one in the 

 present oceans and which has a longer test with the sutures incon- 

 spicuous. This is another case where one must see the actual speci- 

 mens of various authors to determine what they actually had although 

 it is to be suspected that most of the records from recent seas are 

 S. schlumbergeri. Several specimens are figured. 



Sigmoilina schlumbergeri — Material examined 



SIGMOILINA ASPERULA (Karrer) 



Plate 11, Figures 4 a,b 



Spiroloculina asperula Karrer, Sitz. Akad. Wiss. Wien, vol. 58, abt. 1, 1868, 



p. 136, pi. 1, fig. 10.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 152, pi. 8, figs. 11, 13, 14. 



Sigmoilina asperula Cushman, Bull. 103, U. S. Nat. Mus., 1918, p. 81, pi. 



31, figs. 3 a, b. 



Test but slightly longer than wide, lenticular, periphery rounded; 



chambers numerous, arranged in a sigmoid manner, several visible 



