FORAMINIFERA OF THE ATLANTIC OCEAN 



101 



trally; wall smooth and polished, very white; aperture, an elongate 

 opening ven trally, with a slight lip. 



Diameter usually not over 0.25 mm. 



This is different from d'Orbignj^'s Rotalina patagonica which is an 

 Eponides as a study of collections from the coast of South America 

 has shown. 



So far as the Atlantic material studied is concerned, the species 

 seems to be very rare. Brady's original material was from the Faroe 

 Channel, and our specimens are from the same general region. 



Globorotalia scitula — Material examined 



Genus CYCLOLOCULINA Heron-Allen and Earland, 1908 



Cycloloculina Hehon-x\llen and Earland, Journ. Roy. Micr. Soc, 1908, 

 p. 533. — CusHMAN, Special Publ. No. 1, Cushman Lab. Foram. Res., 

 1928, p. 314. 



Genotype, by designation. — Cycloloculina annulata Heron-Allen and 

 Earland. 



Test with the early chambers in a low trochoid spire, the chambers 



globular, then becoming elongate, the periphery somewhat spinose, 



with short conical spines, later chambers still more elongate finally 



becoming annular; wall calcareous, coarsely perforate; no general 



aperture, the large coarse perforations serving as apertures. 



Eocene. 



Genus SHERBORNINA Chapman, 1922 



Sherbornina Chapman, Journ. Linn. Soc. Zool., vol. 34, 1922, p. 501. — 

 Cushman, Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 314. 



Genoholotype. — Sherbornina atkinsoni Chapman. 



"Test discoidal, moderately thin, median arch concave. Shell built 

 up of a median annular series of chamberlets with a discorbine com- 

 mencement; the loculi of the annuH widely spaced. External layer 

 formed of small overlapping spatulate chamberlets. The primordial 

 series of about 7 globular to reniform segments, lying in the median 

 system, is discorbine — that is, depressed rotaline. Shell-wall perfo- 

 rated with coarse tubuli." (Chapman.) 



Miocene. Tasmania. 



