12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 76 



Genus TRUNCATULINA d'Orbigny, 1826 



TRUNCATULINA COONENSIS W. Berry, new species 



Plate 3, Figures 1, 2, 3 



Test free, biconvex, dorsal side less convex than ventral, peripheral 

 margin slightly rounded and slightly subcarinate, chambers numer- 

 ous, 9 to 10 in the last coil, involute on ventral side, sutures de- 

 pressed, slightly distinct, wall punctate; aperture an arched opening 

 at the base of the last formed chamber with a slit extending under 

 the dorsal margin of the chambers. • 



Diameter, 0.35 mm. 



T. coonensis is like T. vulgaris Plummer except that it lacks the 

 limbate sutures of that species. It is also somewhat like a form de- 

 scribed by Sandidge in manuscript but again it differs in the sutures 

 and in the amount of convexity of the test. T. coonensis is fairly 

 common in the Ripley at this point. 



Rolofype.— Cat. No. 73683, U.S.N.M. 



TRUNCATULINA RIPLEYENSIS W. Berry, new species 

 Plate 3, Figures 4, 5, 6 



Test apparently free, small, very unequally biconvex, ventral side 

 being nearly flat, peripheral margin fairly acute but not carinate, 

 chambers numerous, all visible from the dorsal side, the ventral side 

 involute, usually 8-9 in the last coil; sutures level, indistinct except 

 in the last part of the test; surface finely punctate; aperture a simple 

 arched opening at the base of the last chamber. 



Diameter, 0.28 nim. 



This species, which I have described as new, is probably closely 

 related to T. temdmargo H. B. Brady, but differs in lacking the cari- 

 nate edge and in other minor respects. T. ripleyensis is the smallest 

 Truncatulina found in the Ripley at this point and differs, as far as 

 I know, from any others found at other points in the same formation. 



Holotype.— Cat. No. 73684, U.S.N.M. 



TRUNCATULINA WADEI W. Berry, new species 



Plate 8, Figures 13, 14, 15 



Test free, biconvex, slightly unequally so, peripheral margin 

 broadly rounded, slightly lobate in young specimens; chambers 

 numerous, 9-10 in the last coil, involute on the ventral, partly so on 

 the dorsal; sutures distinct, depressed on ventral side, slightly 

 limbate on the dorsal face, dorsal surface coarsely punctate, ventral 

 more finely punctate; aperture a simple arched opening at the base 

 of the final chamber. 



Diameter, 0.39 mm. 



