16 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Brady's specimens from off the Shetlands (pi. 109, figs. 17, 18) 

 (according to Nuttall), show an equilateral face, but this is not usual 

 in specimens I have seen from the eastern North Atlantic. Brady 

 speaks of it, however, as follows: "This chamber is frequently devel- 

 oped inequilaterally, and in such cases the test assumes a Rotaliform 

 aspect, which has been an occasional source of confusion and error." 



This is a very beautiful little species and occurs abundantly in 

 dredgings sent me by the late Joseph Wright a number of years ago. 

 Figures of some of these are given on Plate 13. 



Nonionella turgida — Material examined 



Genus ORBIGNYNA Hagenow, 1842 



Orhignyna Hagenow, Neues Jahrb. ftir Min., 1842, p. 573. — Cushman, 

 Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 204. 



Genoholotype. — Orhignyna ovata Hagenow. 



Test planispiral, involute; chambers distinct, later ones with the 

 sides continuing back over the umbilical area; wall calcareous, finely 

 perforate; aperture in the adult, rounded, in the middle of the aper- 

 tural face. 



Cretaceous of Europe and America. 



This genus is allied to Nonion and differs largely in the position of 

 the aperture which in Orhignyna is rounded and in the middle of the 

 apertural face instead of a slit between the apertural face and the 

 preceding coil as in Nonion. 



Genus CRIBROSPIRA MoUer, 1878 



Cribrospira Moller, Mem. Acad. Imp. Sci. St. P6tersbourg, ser. 7, vol. 25, 

 no. 9, 1878, p. 86. — Cushman, Special Publ. No. 1, Cushman Lab. Foram, 

 Res., 1928, p. 204. 



GenoJiolotype. — Cribrospira panderi Moller. 



Test mostly involute, bilaterally symmetrical, at least in the adult; 

 aperture cribrate, the numerous rounded openings in a more or less 

 concentric grouping on the apertural face. 



Carboniferous to Cretaceous (?). 



