AET. 6 FORAMINIFBRA: POLYMORPHINIDAE — CUSHMAN AND OZAWA 57 



Distribution. — The present species is widely distributed in various 

 Cretaceous deposits both in Europe and America. In the Tertiary 

 and Recent, it is not as common as in the Cretaceous, and these may 

 finally be recognized as distinct. The localities of our specimens are 

 as follows: 



Recent. — Albatross stations off the east coast of the United States 

 and Brazil (rare specimens of the same general form as this species). 



Pliocene. — Belgium, Crag noir, Antwerp (very rare specimens 

 which may be referred to this species at present). 



Miocene. — "Green clay," Cipero section, Trinidad (a single speci- 

 men referred to this species). 



Oligocene. — Germany, Ahnatal, near Cassel; Hermsdorf, near 

 Berlin; Sollingen; Diisseldorf. 



Eocene. — South of Hospital HUl, San Fernando, Trinidad, British 

 West Indies. 



Cretaceous. — England, Chalkmarl, Folkestone; Saxon Cement 

 Works, Cambridge; Cambridge Greensand, Saxon Cement Works, 

 Cambridge; Gault, Folkestone; Barnwell Pit, Cambridge. Germam^, 

 upper Senonian, Dasbeck, near Hanover, Westphalia; Turonian, 

 Birkwitz, near Pirna. Mexico, Velasco Shale, Hacienda El Limon, 

 near Panuco. 



PYRULINA THOUINI (d'Orbigny) 



Plate 14, figures Qa-c 



Polymorphina thouini c'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 265, No. 8; 

 model No. 23. — H. B. Brady, Parker, and Jones, Trans. Linn. Soc, 

 vol. 27, 1870, p. 232, pi. 40, fig. 17.— Goes, Kongl. Svensk. Vet. Akad. 

 Handl., vol. 25, no. 9, 1894, p. 59, pi. 10, figs. 557-558. 



Test attenuate, subcjdindrical, almost circular in end view; cham- 

 bers elongate, not much embracing, arranged at first in a nearly 

 triserial series becoming biserial later, each succeeding chamber re- 

 moved much farther from the base; sutures slightly depressed, dis- 

 tinct; wall smooth, translucent; aperture radiate. 



Length 0.65-0.95 mm.; breadth 0.20-0.25 mm.; thickness 0.18- 

 0.25 mm. 



Pyrulina thouini is one of the best defined species of Pyrulina, and 

 is closel}^ related to the widely distributed Pyrulina cylindroides, from 

 which it ma}^ be derived by drawing out the slender fusiform cham- 

 bers which are placed less obliquely, and accordingly the test becomes 

 more elongate. Terquem's Polymorphina thouini from Vaudancourt 

 somewhat resembles d'Orbigny's species, but we should hesitate to 

 place it under the synonymy of the present species, as it has much 

 depressed sutures. 



We have examined miaterial from the Paris Basin, and obtained 

 some excellent specimens coinciding well with the model of d'Orbigny. 

 The original specimen is lost. 



