AET. 6 FOEAMINIFERA : POLYMORPHINIDAE — CUSHMAN AND OZAWA 115 



known species of Polymovphina having the chambers arranged in 

 an entirely biserial manner. 



Distribution. — Reuss first described Polymorphina subrhombica 

 from the Upper Cretaceous (?) (Eocene (?)) of New Jersey, where it 

 is rather common in the Eocene formation, and from which we have 

 several specimens. The formation formerly supposed to be Cre- 

 taceous in New Jersey is probably Eocene. 



POLYMORPHINA ACULEATA d'Orblgny 



Plate 30, figure 4 



Polymorphina aculeata d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 265, 

 No. 5.— FoRNASiNi, Riv.Ital. Pal., vol. 8, 1902, p. 1, pi. 1, fig. 1. 



Test compressed, elongate, margins almost parallel, acute at both 

 ends, initial end with a spine; chambers compressed, elongate, alter- 

 nating; sutures but little depressed, distinct; wall ornamented with 

 fine costae, interrupted at the sutures; aperture produced, radiate. 



Polymorphina aculeata, listed by d'Orbigny but not figured or de- 

 scribed until 1902 by Fornasini, is a well-characterized species 

 reported from the environs of Paris. We have examined material 

 from the Paris Basin, but we could not find any specimen like this. 

 The above description is based on Fornasini's figure. 



Distribution. — Known only from the Eocene of the Paris Basin. 



POLYMORPHINA LONGISTRIATA Cushman and Ozawa, new species 



Plate 30, figure 5 



Polymorphina complanata (d'Orbigny) var. striata Burrows and Holland, 

 Proc. Geol. Assoc, vol. 15, 1897, p. 46, pi. 2, fig. 15. 



Test elongate, rhomboidal, compressed, almost symmetrical; 

 chambers compressed, alternating, arranged in an entirely biserial 

 series; sutures slightly depressed, distinct; wall ornamented by 

 longitudinal costae interrupted at the sutures; aperture radiate. 



We have examined material which we collected from the Thanet 

 beds of Pegwell Bay, but we did not find any specim.en like Poly- 

 morphina complanata var. striata described by Burrows and Holland. 

 This seems to be quite distinct from any described species. It is 

 evidently related to Polymorphina complanata d'Orbigny in its much 

 specialized biserial arrangement of chambers, but it is not only orna- 

 mented but the test is also much elongated and its chambers are 

 much broader than those of Polymorphina complanata. 



A new specific name "longistriata" is proposed. 



Its nearest ally seems to be Polymorphina advena Cushman, from 

 which it is separated by its more elongate, angular test, and coarser 

 ornamentation. 



Distribution.- — The only known record is from the Thanet beds of 

 Pegwell Bay in England. 



