FAMILY 31. BULIMINIDAE 247 



Test, an elongate close spiral, the spiral suture marked; the 

 chambers in each whorl several, forming- a double series ; aper- 

 ture elongate, curved. 



Recent. 



The species of Robertina are found largely in cold water of 

 the Arctic and North Temperate regions. 



Subfamily 3. Bulimininae 



Test spiral, usually triserial, becoming involute and finally 

 in Entosolenia monothalamous ; aperture loop-shaped, the larger 

 end away from the inner margin, (or in Entosolenia rounded) 

 usually with a distinct tooth and internal tube connecting the 

 chambers, (or in Entosolenia free at the inner end). 



Genus BULIMINA d'Orbigny, 1826 

 Plate 35, figures 15-18; plate 37, figure 6 



Genotype, by designation, Bulimina 7narginata d'Orbigny 



Bulimhia d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 269. 



Pleurites Ehrenberg, Mikrogeologie, 1854, pi. xxvii, fig. 32 (genotype, 



by designation, Pleurites cretae Ehrenberg). 

 Cucurbitina CoSTA, Atti Accad. Pontaniana, vol. 7, pt. 2, 1856, p. 363 



(genoholotype, Cucurbitiyia cruciata Costa). 



Test, an elongate spiral, generally triserial ; chambers inflated, 



spiral suture more or less obsolete ; wall calcareous, perforate ; 



aperture loop-shaped with a tooth or plate at one side and an 



internal spiral tube connecting through the chambers between 



• the apertures. 



Jurassic to Recent. 



Genus NEOBULIMINA Cushman and Wickenden, 1928 

 Plate 54, figure 6 



Genoholotype, Neobulimma canadensis Cushman and Wickenden 



Neobulimi7ia Cushman and Wickenden, Contr. Cushman Lab. Foram. 

 Res., vol. 4, 1928, p. 12. 



Test in the early stages of both microspheric and megalo- 

 spheric forms triserial, later biserial, not compressed ; chambers 

 distinct, subglobular, inflated throughout, simple; wall cal- 

 careous, perforate ; aperture in the triserial stage elongate, 

 oblique, narrowest near the base of the chamber, widest near 

 the inner end, in the biserial stage much less oblique, broader, 



