333 Tkrtiary Foraminifera 39 



II, Mem. Ill, p. 60, pi. iv, figs, i — 3,1882. 



Test orbicular, piano- convex or nearly so, superior side being 

 flat, the inferior highly conv^ex and deeply excavated at the um- 

 bilicus; peripheral margin subangular, segments numerous sep- 

 arated by curved septa upon the superior side, consisting of 

 three or more convolutions, the inferior side consisting of 

 elevated segments showdng a somewhat lobulated margin and with 

 depressed septa. 



Professor Brad)' says of this species "It is isomorphous with 

 Tj'uncatulina lobatida in the Planorbulinc series, and forms a 

 connecfting link between Rotalia beccarii and Rotalia soldinii.'" 



Horizon and locality. — Miocene; Norfolk, Va.;685 ft. 



Geological distribution. — Eocene to Recent. 



Rotalia soldanii. 



Sj'ii. Rotalia {Gyro7di>ia)soldaiiii cx'Orhigny, Ann, Sci. Nat., vol. vii, p. 

 278, No. 5; — Modele, No. 36, 1826. 

 Rotalia soldanii Hantken, 1875, Mittheil. Jahrb. d. k. ung. geol. 

 Anstalt, p. 80, pi. IX, fig. 7, a — c. 



Test plano-convex or nearly so, circular, and with slightly lob- 

 ulated periphery, superior side showing numerous curved septa, 

 inferior much vaulted, with approximately straight septa which 

 are excavated at the umbilicus. 



"The plano-convex habit of growth reaches its extreme devel- 

 opment, so far as the present genus is concerned, in Rotalia sol- 

 danii, the test of which resembles that of Rotalia orbicularis, ex- 

 cept that the convexity of the inferior side is considerably 

 greater. The species corresponds morphologically to Truncatu- 

 lina refulgens and Pulvinulina micheliniana , but the shell is more 

 neatly and compaAl}' built, the outline is more rounded, and the 

 walls more finely perforated than in either of the latter species. 

 Sedlions of the test show that the septal walls are double, and 

 that there is a considerable deposit of shell-substance in the region 

 of the umbilicus, but without any trace of canals." (Chal. Rept., 

 vol. IX, p. 706.) 



Horizon and locality — Miocene; Norfolk, Va. Well boring, 

 depth, 645 ft. 



Geological distribution. — Cretaceous; Miocene to Recent. 



Genus NONIONINA d'Orbigny. 

 Nonionina affinis, 



Syn. Nonionina affinis Reuss, Sitz. Ak. Wiss. Wien., vol. iii, p. 72, 



