FORAMINIFERA OF THE ATLANTIC OCEAN 



19 



DISCORBIS CANDEIANA (d'Orbigny) 



Plate 7, figures 4 a-c 



Rosaliaa candeiana d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 



1839, " Foraminiferes," p. 97, pi. 4, figs. 2-4. 

 Truncatulina candeiana Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, 



p. 57, pi. 13, figs. 4, 5; Publ. 311, Carnegie Instit. Washington, 1922, 



p. 47, pi. 6, figs. 7-9; Publ. 344, 1926, p. 78. 

 Truncatulina cora Cushman (not d'Orbigny), Publ. 311, Carnegie Instit. 



Washington, 1922, p. 48, pi. 7, figs. 3-5. 



Test trochoid, composed of about 2.5 coils, the last-formed coil 

 composed of about six chambers, rapidly increasing in size, inflated; 

 periphery rounded, lobiilated; sutures depressed, except in the early 

 part of the test, ventrally somewhat umbilicate, concave; wall coarsely 

 perforate, the opening of each perforation small and surrounded by a 

 ring of whitish thickened shell material, the remainder of the wall 

 translucent; aperture, a narrow, arched slit at the base of the last- 

 formed chamber with a slight lip; color of the early portion dark 

 reddish-brown, becoming lighter, and the last few chambers white. 



Diameter usually not exceeding 0.4 mm. 



This is a very common species in the West Indian region in com- 

 paratively shallow water. Some of the attached specimens flatten 

 and spread out and resemble in outline the form described by 

 d'Orbigny as ''Rosalina cora." Except for this spreading due to 

 attachment there is little variation, and the species is easily dis- 

 tinguished in West Indian material. 



Discorbis candeiana — Material examined 



