AET. 6 FORAMINIFERA: POLYMORPHINIDAE — CUSHMAN AND OZAWA 111 



Test almost equally compressed on both sides, oval, margin 

 rounded; chambers not numerous, usually five or six, compressed, 

 usually almost as broad as long, arranged in a nearly biserial series; 

 sutures not depressed; wall smooth; aperture radiate. 



Length, 0.55-0.75 mm.; breadth, 0.45-0.60 mm.; thickness, 0.18- 

 0.25 mm. 



Several different names were given by various authors to the 

 different phases of growth of the present species. Globulina de- 

 pressa, listed by d'Orbigny from the environs of Beauvais in 1826 

 and figured much later by both Terquem and Fornasini, having 

 four chambers, evidently represents a young stage of the present 

 species. The name, however, can not be used, as the 1826 species 

 was not described or figured until much later. 



Polymorphina solidula Terquem is a form having the last chamber 

 added in a slightly abnormal manner. We have such specimens 

 among our collections of Pseudopolymorphina incerta. 



Polymorphina depauperata Reuss is undoubtedly the same as 

 Globulina depressa in every respect. 



Polymorphina incerta Egger, having the priority among several 

 specific names proposed for the present species, is an adult and more 

 common form. 



Polymorphina amygdaloides var. lepida Fornasini, with slightly 

 acute initial end, and Polymorphina subdilatata Egger are forms of 

 the present species havmg a more or less elongate test. 



Polymorphina foveolata was separated by Reuss from Polymorphina 

 depauperata because of its thicker and more or less irregularly oval 

 test and sparsely distributed surface depressions, but such differ- 

 ences appear to us not as important as the other more essential 

 characters which show no real differences between the above two 

 species. 



Polymorphina media Egger has an elongate test and is in some 

 respects unlike the present species, but we think it is better to place 

 it as within the range of variation of Pseudopolymorphina incerta. 



Distribution. — One of the most common species distributed widely 

 in the European younger Tertiary deposits. We have the species 

 from the following localities : 



Recent. — Italy, shore sand of Rimini on the Adriatic. 



Miocene. — France, Helvetien, Pontlevoy; Aquitanien superieur, St. 

 Avit, near Mont de Marsen; La Brede, Larriey ; Burdigalien superieur, 

 Merignac (Gironde); Burdigalien inferieur, Dax; Moulin de i'Eglise, 

 Saucats; Le Coquillat, Leognan. Hungary, Tortonian, Varpolata. 



Eocene. — France, Lutetien, Orbitolites bed, Grignon. England, 

 Bracklesham bed XVII, White Cliff Bay, Isle of Wight. 



