FORAMINIFERA OF THE ATLANTIC OCEAN 29 



ing beneath the somewhat extended central portion of the last- 

 formed chamber. 



Diameter up to 0.85 mm. 



This species is apparently very widely distributed if one may take 

 all the records without figures as referring to the same species. There 

 are numerous forms both fossil and living which fit the general de- 

 scription given for this species. A study of these in detail will un- 

 doubtedly show that more than a single species is involved. 



In the West Indian region such specimens as here described are 

 not uncommon. The figured specimen is from off Jamaica. Brady's 

 Challenger figures (pi. 88, fig. 4 a-c) represent a Bermuda specimen 

 of the same form. His other figures for the Pacific show considerable 

 differences. 



DISCOKBIS ORBICULARIS (Terquem). var. SELSEYENSIS (Heron-AUen and Earland) 



Plate 7, figures 1 a, b. 



Discorbina rosacea d'Orbigny, var. selseyensis Heron-Allen and Earland, 

 Journ. Roy. Micr. Soc, 1911, p. 330, pi. 10, figs. 20, 21. 



Variety differing from the typical in having radial corrugations on 

 the ventral side. 



This variety described from Recent material off Selsey Bill, Sussex, 

 England evidently is a variety of Discorbis orbicularis (Terquem). 



DISCORBIS PARISIENSIS (d'Orbigny) (?) 



Plate 6, figures 5 a-c. 



There are numerous records for this species living in the Atlantic 

 and elsewhere. The typical form from the Eocene of the Paris Basin 

 is a large very striking form, and seems to be decidedly different 

 from most of the published figures of living specimens referred to it. 

 The figured specimen is from off the coast of Belgium. 



DISCORBIS PATELUFORMIS H. B. Brady (?) 



Egger records this species from the Cape Verde Islands. His 

 figures are very much lacking in details, and as this is the only record 

 for this typical Indo-Pacific species in the Atlantic, it is probably 

 not this species. 



DISCORBIS PERUVIANA d'Orbigny 



To this South American Pacific species have been referred various 

 specimens from the British Isles and elsewhere. The figures given 

 however do not seem to be identical with that of d'Orbigny. 



DISCORBIS PLANORBIS (d'Orbigny) (?) 



It may be noted that Heron- Allen and Earland have under '' Dis- 

 corbina planorbis (d'Orbigny)" recorded high spired forms from the 

 British Isles. I have examined much material of " Asterigerina 



