8 PKOCEEDINGS OP THE NATIONAL MUSEUM vol.76 



This is the largest and most common species of Cristellaria in the 

 material from Coon Creek. Mrs. Plummer reports it as a common 

 form in the Midway of Texas. 



Plesiotyj)e.--C^t. No. 73673, U.S.N.M. 



CRISTELLARIA ORBICULARIS (d'Orbigny), var. MINUTA W. Berry, new variety 



Plate 1, Figure 2 



Test closely coiled, biconvex, composed of numerous chambers, 

 usually 7-8 in the last formed coil ; peripheral margin acute to sub- 

 carinate; sutures slightly limbate and slightly raised; there is a 

 slightly raised umbo; walls smooth, shiny; aperture radial and vis- 

 ible in several chambers before the final one. 



Diameter, 0.74 mm. 



This variety, which bears a close resemblance to the species C. 

 orbicuIa7-is, is smaller and does not have such a distinct keel. It is 

 fairly common in the material from Coon Creek. 



Holotype.—C^t. No. 73674, U.S.N.M. 



CRISTELLARIA WADEI W. Berry, new species 



Plate 1, Figure 1 



Test small, closely coiled, biconvex; chambers numerous, usually 

 about 8 in the last formed coil ; peripheral margin very acute, carni- 

 ate with a thin keel about one-eighth of the length of the rest of the 

 test ; sutures very slighly depressed ; surface smooth ; aperture radial. 



Length, 0.64 mm. 



G. wadei is somewhat like C. suhmmmllegera Cushman in general 

 appearance of the keel, but does not have the raised ridge extending 

 to the umbo, and is smaller. G. wadei can be compared with G. 

 exj)ansa Cushman but, again it is smaller and lacks the alar projec- 

 tion. Complete specimens of this species are rare in the material; 

 in most cases the thin keel is broken off either entirely or in, parts, 

 both of which conditions are apt to lead one to incorrect conclusions. 



H oloty pe.—C&t. No. 73675, U.S.N.M. 



Genus VAGINULINA d'Orbigny, 1826 



VAGINULINA WADEI Kelley, new species 



Plate 1, Figure 7 



Test elongate, slender, compressed except proloculum, broadening 

 slightly with the addition of chambers; pei'iferal edge straight, 

 proximal edge nearly so; apertural face at an angle of about 45° with 

 periferal edge; chambers 8 in number, proloculum spherical, sub- 

 sequent chambers elongate oblique, slanting down from the periferal 

 edge to the proximal edge at an angle of about 45°, ornamented with 

 14 longitudinal costae on the proloculum, 16 on the third and 



