FORAMINIFERA OF THE ATLANTIC OCEAN 61 



ROTALIA BECCARII (Linnaeus), var. TEPIDA Cushman 



Plate 13, figures 3 a-c 



Rotalia beccarii (Linnaeus), var. tepida Cushman, Publ. 344, Carnegie Instit., 

 Washington, 1926, p. 79, pi. 1. 



Test small, almost equally biconvex, the dorsal side slightly more 

 than the ventral, chambers 6 or 7 in the last-formed whorl; peripheral 

 margin rounded; sutures slightly limbate above, ventrally much 

 depressed; toward the umbilicus the chambers separated, forming 

 angular, open spaces, the ends of the chambers extended to a point; 

 wall smooth, finely punctate; aperture, a narrow slit beneath the 

 inner angle of the last-formed chamber, often supplemented by a 

 nearly circular, small opening near the base of the ventral face of the 

 last-formed chamber. 



Diameter not over 0.35 mm. 



This variety is common in warm protected waters in the West 

 Indian region. I collected it at numerous stations in San Juan Harbor, 

 P. R., and at Ponce on the southern side of the same island. It occurred 

 at three stations in my Tortugas material, two in the warm, shallow, 

 stagnant water of the moat at Fort Jefferson, Garden Key, and the 

 other on Long Key in a tide pool where the water at low tide was very 

 warm. It is probably to be found widely distributed in the West 

 Indian region in such habitats. 



Rotalia beccarii, var. tepida — Material examined 



