FAMILY 27. ALVEOLINELLIDAE 227 



Melonia Defrance, Diet. Sci. Nat., vol. 32, 1824, p. 176 (genotype, by 



designation, Melonites sphaerica Lamarck). 

 Alveolina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 306 (genotype, by 



designation, Oryzaria boscii Defrance). 



Test globular or fusiform, coiled planispirally about an axis, 

 early coils as well as later ones low; chambers divided into 

 chamberlets ; apertures usually in a single row. 



Eocene to Recent. 



Genus ALVEOLINELLA H. Douville, 1906 



Plate 32, figures 17-19 

 Genoholotype, Alveolina quoyi d'Orbigny 

 Alveolinella H. DouviLLE, Bull. Soc. Geol. France, ser. 4, vol. 6, 1906, p. 



585. 

 Alveolina (part) d'Orbigny, 1826. 



Test fusiform, planispirally coiled about an axis, all coils 

 low; apertures very numerous, in several rows. 



Recent. 



This group has parallelisms in the group of FusuUna and its 

 allies in the Palaeozoic and in the arenaceous group with 

 Loftusia. The form is easily derived from such a genus as 

 Peneroplis by the division of the close coiled forms into chamber- 

 lets and an elongation of the axis. Some species which may 

 be referred to Borelis are very much flattened in the line of 

 the axis and are very close to Peneroplis except that the cham- 

 bers are divided. Such forms are widely distributed in the 

 Eocene. 



FAMILY 28. KERAMOSPHAERIDAE 



Test globular, the wall imperforate, of generally concentric 

 chambers divided into chamberlets, generally flattened, parallel 

 to the surface in concentric layers, communicating with adjacent 

 chambers both in the same layers and in the layers above and 

 below; apertures rounded, all at the margin of each chamberlet. 



Genus KERAMOSPHAERA H. B. Brady, 1882 

 Plate 32, figures 21, 22 

 Genoholotype, Keramosphaera niurrayi H. B. Brady 

 Keramosphaera H. B. Brady, Ann. Mag. Nat. Hist., ser. 5, vol. 10, 1882, 

 p. 245. 



