222 FORAMINIFERA 



chambers; apertures in a double, alternating line along the 

 periphery. 



Miocene to Recent. 



Bradyella Munier-Chalmas is probably a synonym of 

 Amphisorus. 



Genus MARGINOPORA Quoy and Gaymard, 1834 



Plate 32, figures 1-4 

 Genoholotype, Marymopora verteby-alis Quoy and Gaymard 



Marfjinopora QuoY and Gaymard, Voyage de I'Astrolabe, 1833 fide 



Blainville, Man. Actin., 1834, p. 412. 

 Orbitolites (part) of authors (not Lamarck). 



Test in the early stages similar to Soyites with one or two 

 rows of apertures, later with the two original planes of cham- 

 bers forced apart and filled with a high series of chamberlets, 

 those adjacent in each annular chamber connecting, the outer 

 wall projecting beyond the peripheral plane of the lateral 

 chambers ; the apertures in more or less vertical rows on the 

 periphery with a horizontal row above and below. 



Recent. Indo-Pacific. 



Genus ORBITOLITES Lamarck, 1801 



Plate 32, figure 6 

 Genotype, by designation, Orbitolites complanata Lamarck 



Orbitolites LAMARCK, Syst. Anim. sans Vert., 1801, p. 376. 



Discolites (?) MoNTFORT, Conch. Syst., vol. 1, 1808, p. 187 (genoholotype, 



Discolites concentricns Montfort). 

 Orbulites Lamarck, Extrait Cours Zool., 1812, p. 26 (genoholotype, 



Orbitolites complanata Lamarck). 



Test discoidal, the earliest chambers in the microspheric form 

 coiled, later annular, divided into chamberlets, those of the 

 same annular chamber not connecting with each other but with 

 those of the adjacent preceding and succeeding annular cham- 

 bers; wall imperforate except in the very earliest chambers 

 which are perforate; apertures numerous, rounded on the 

 periphery of the test. 



Eocene. 



