314 FORAMINIFERA 



Genus CYCLOLOCULINA Heron-Allen and Earland, 1908 



Plate 48, figure 10; plate 49, figures 5-8 

 Genotype, by designation, Cycloloculina annulata Heron-Allen and Earland 

 Cyclolocul'ma Heron-Allen and Earland, Journ. Roy. Micr. Soc, 1908, 

 p. 533. 



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

 chambers globular, then becoming elongate, the periphery some- 

 what 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 



Plate 49, figures 9, 10 

 Genoholotype, Sherburnina atkinsoni Chapman 

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



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

 built up of a median annular series of chamberlets with a 

 discorbine commencement ; the loculi of the annuli widely spaced. 

 External layer formed of small overlapping spatulate chamber- 

 lets. The primordial series of about 7 globular to reniform 

 segments, lying in the median system, is discorbine — that is, 

 depressed rotaline. Shell-wall perforated with coarse tubuli." 

 (Chapman). 



Miocene. Tasmania. 



This family evidently represents a return to the rotalid 

 ancestry of Globigerina, that of a Discorbis-like test. 



The compressed forms seen in many of the species of this 

 family have been included in the Globigerinidae, and some of 

 those which have been referred to Pulvinulina in the literature 

 do not fit at all the forms now included under Eponides. The 

 pelagic habit of many of these species, and their association with 

 the Globigerinidae in both recent and fossil Globigerina-msiYls 

 and oozes show their close relationship. By reversion to the 

 ancestral form this group helps to make clear the fact that the 

 Globigerinidae have developed from the Rotaliidae as a special- 

 ized group adapting themselves to a pelagic condition. In Cyclo- 

 loculina, there is developed the annular form which in its aper- 



