FORAMINIFERA OF THE ATLANTIC OCEAN 



25 



figures given here are copied from the type figures given by Wright. 

 It has not occurred in the western Atlantic material. 



Our figured specimen is from the coast of Belgium and is close to 

 this species in the ventral and side views, but has the chambers more 

 overlapping in dorsal view. 



It is very close to Discorbis nitida (Williamson) except on the 

 ventral side. 



DISCORBIS MIRA Cushman 



Plate 5, figures 5, 6 a-c 



Discorbis turbo H. B. Brady (and subsequent authors; not d'Orbigny), Rep. 



Voy. Challenger, Zoologj', vol. 9, 1884, p. 642, pi. 87, figs. 8 a-c. 

 Discorbis mira Cushman, Publ. 311, Carnegie Instit. Washington, 1922^ 



p. 39, pi. 6, figs. 10, 11; Publ. 344, 1926, p. 77. 



Discorbis mira — Material examined 



Test plano-convex, dorsal side forming a low cone, ventral side 

 flattened and very slightly convex, trochoid, the last-formed whorl 

 consisting of about six chambers; sutures oblique, curved very 

 slightly, if at all, depressed on the dorsal side, on the ventral side 

 depressed, the area thus formed often filled by alar prolongations 

 from the center; periphery slightly lobulate, on the dorsal side the 



