186 FORAMINIFERA 



Periples Montfort, 1. c, p. 271 (genoholotype, Periples elongatus MONT- 



fort). 

 Robulina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 287 (genotype, by 



designation, Robulus cultratus Montfort). 

 Cristellaria (part) of authors. 



Test planispiral, bilaterally symmetrical, typically close coiled, 

 usually involute; chambers numerous, triangular in side view; 

 wall very finely perforate, glassy; aperture, an elongate slit on 

 the median line of the usually somewhat concave apertural face 

 in addition to the radiate aperture of the outer peripheral angle. 



Jurassic to Recent. 



From the very poor figures and descriptions given by Mont- 

 fort, it is very difficult to know whether the supplementary 

 aperture of Robulus is present or not in some of the genera 

 erected by him. Some of these very evidently have it. Others 

 such as Astacolus have it in his figure, but it is doubtful in the 

 others referred to by Montfort. 



Genus LENTICULINA Lamarck, 1804 



Plate 24, figure 8; plate 25, figure 4 

 Genotype, by designation, Lenticulina rotulata Lamarck 



Lenticulina Lamarck, Ann. Mus., vol. 5, 1804, p. 186. 



Antenor Montfort, Conch. Syst., vol. 1, 1808, p. 71 (genoholotype, 



Antenor diaphaneus Montfort). 

 Oreas (?) Montfort, 1. c, p. 95 (genoholotype, Oreas subulatiis Mont- 

 fort =A''a.?ti(7»s aciitauricularis Fichtel and Moll). 

 Clisiphontes (?) Montfort, 1. c, p. 227 (genoholotype, Clisiphontes cal- 



car Montfort). 

 Cristellaria Lamarck, Extract Cours Zool., 1812, p. 122 (and later 



authors). 

 Test planispiral, bilaterally symmetrical, typically close coiled 

 or in many species tending to become uncoiled ; wall very finely 

 perforate, glassy, smooth or variously ornamented; aperture 

 radiate, typically with a small chamberlet below with a simple 

 rounded aperture opening into the larger cavity of the chamber. 

 Upper Cambrian ( ?) to Recent. 



Genus PLANULARIA Defrance, 1824 



Genoholotype, Planularia auris Defrance 

 Planularia Defkance, Diet. Sci. Nat., vol. 32, 1824, p. 178. 

 Cristellaria (part) of authors. 



