34 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



species of the Paris Basin Eocene described by Lamarck, and which 

 is a very definite and highly ornate species. On the coast of Australia 

 is a species still living which is very close to the Eocene species of 

 Lamarck, but the North Atlantic records as figured are not this. 



DISCORBIS VILARDEBOANA (d'Orbigny) 



This species with its rounded periphery was described and figured 

 by d'Orbigny from the Falklands. It is not the same as the figures 

 Brady assigns to it, and probably most of the Atlantic records are 

 based upon Brady's figures rather than those of d'Orbigny, therefore 

 they should be re-examined to find their exact specific relationships. 

 Some of the records in the West Indies and Indo-Pacific are probably 

 Discorbis mira Cushman. 



Genus LAMARCKINA Berthelin. 1881 



Lamarckina Berthelin, Comptes Rendus Assoc. France (Reims, 1880), 1881, 

 p. 555. — Cushman, Special Publ. No. 1, Cushman Lab. Foram. Res., 

 1928, p. 271. 



Megaloslomina Rzehak, Ann. k. k. Nat. Hofmuseums, vol. 10, 1895, p. 228 

 (genoholotype, Megalostomina fuchsi Rzehak). 



Pulvinulina (part) of Authors. 



Rotalina (part) of Authors. 



Discorbina (part) of Authors. 



Valvulina (part) of Authors. 



Genoholotype. — Pulvinulina erinacea Karrer. 



Test trochoid, evidently attached, dorsal side convex, ventral side 

 usually flattened or concave, dorsal side usually ornamented, ventral 

 side very smooth and highly polished; chambers distinct on the dorsal 

 side, less so on the ventral, each often with an umbilical projection; 

 wall finely perforate, calcareous, ventral side thickened; aperture at 

 the umbilical end of the chamber, often enlarged by resorption. 



Upper Cretaceous to Recent. 



Most of the species of this genus are fossil, but a very few are still 

 found living in the present oceans. Of these, there seem to be four 

 species in the Atlantic that can be referred to this genus. They have 

 the open umbilicus and the elongation of the ventral side of the last- 

 formed chamber together with the somewhat polished ventral side. 



LAMARCKINA VENTRICOSA (H. B. Brady) 



Plate 7, figures 5 a-c 



Discorbina veniricosa H. B. Bradt, Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 654, pi. 9, figs. 7a-c. 

 Lamarckina veniricosa Cushman, Contr. Cushman Lab. Foram. Res., voL 2, 



1926, p. 12. 



"Test free, oblong, rounded, more or less depressed; composed of 

 less than two complete convolutions, the outer whorl consisting of six 

 or seven segments; the successive segments increasing rapidly in 



