340 FORAMINIFERA 



Test lenticular, surface papillate. Embryonic chambers bilocu- 

 lar, one much larger than the other and partly embracing it. 

 Equatorial chambers somewhat elongate radially, outer wall 

 curved, in the adult their sides touch and they become hexagonal 

 in form. The communications between the chambers are by 

 cribriform perforations, about 1.5 \i in diameter, over the entire 

 anterior chamber wall, similar to the perforations of the cham- 

 ber roofs. Pillars between the lateral chambers of pyramidal or 

 conical form, terminating on the surface in granules or rounded 

 pustules. 



Genus PSEUDORBITOIDES H. Douville, iOSS 

 Plate 58, figures 11-15 

 Genoholotype, Orbitoides mamillata Schlumberger 

 Clypaorbis H. Douville, C. R. Acad. Sci., vol. 161, 1915, p. 669, figs. 

 18-20; Bull. Soc. Geol. France, 4th ser., vol. 20, 1920, p. 227, figs. 29-34. 



Test asymetrically lenticular or low conical with a rounded 

 apex. Surface papillate similar to that of Lepidorbitoides. 

 Embryonic chambers composed of an initial spheroidal cham- 

 ber, below which are developed 3 or 4 chambers arranged as a 

 rosette. The embryonic chambers actually form a conical spiral 

 which appears in the arrangement of the early lateral cham- 

 bers. The equatorial chambers have convex outer walls and form 

 a network of hexagonal pattern. The chambers are radially 

 shortened, are arranged along radial lines, and increase in num- 

 ber by bifurcation of or intercalation between older linear 

 series. Communication between chambers by minute perfora- 

 tions of the same kind as those in roofs of the chambers, therein 

 resembling Lepidorbitoides. The anterior chamber wall appears 

 to be a direct continuation of the chamber roof with the main- 

 tenance of the same porous texture. 



Maestrichtian. 



Genus PSEUDORBITOIDES H. Douville, 1923 



Plate 58, figures 16, 17 

 Genoholotype, Pseudorbitoides trechmanni H. Douville 

 Pseudorbitoides H. Douville, C. R. Soc. Geol. France, 1922, p. 203; Bull. 

 Soc. Geol. France, 4th ser., vol. 23, 1923, p. 369, figs. 1,2. 



Test lenticular, rather small. Embryonic chambers in a dis- 



