8 PROCEEDINGS OF THE NATIONAL MUSEUM vol.80 



this Cretaceous material to the Recent deep-water fauna of the 

 Atlantic. 



Genus NODELLUM Rhumbler, 1913 



NODELLUM VELASCOENSIS (Cushman) 



Plate 1, Figuees 15-17 



Nodosinella velascoensis Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 10, p. 

 583, pi. 20, fig. 9, 1926.— White, Journ. Pal., vol. 2, p. 309, pi. 41, fig. 15, 

 1928. 



This species has already been recorded from the Velasco shale of 

 Mexico, where it occurs in some abundance. It is very abundant, 

 however, in the Hobson clay of Trinidad. Though it is usually dis- 

 torted, as in Mexico, specimens are so abundant that a certain pro- 

 portion of them may be found that shows the normal form of the 

 species. The proloculum is always longer than broad and somewhat 

 pear-shaped. The following chambers in the megalospheric form 

 increase very little if at all in diameter, while in the microspheric 

 form they are much more numerous and increase rapidly in size as 

 added. The wall seems to be almost entirely chitinous and nearly 

 transparent, a fact that accounts for specimens being usually very 

 much distorted. The other specimens of this genus are characteristic 

 of comparatively deep water of the present oceans. 



Family AMMODISCIDAE 



Subfamily Ammodiscinae 



Genus AMMODISCUS Reuss, 1861 



AMMODISCUS GLABRATUS Cushman and Jarvis 



Plate 2, Figure 1 



Ammodiscus glabratus Cushman and JAK\^s, Contr. Cushman Lab. Foram. 

 Res., vol. 4, p. 86, pi. 12, figs. 6 a, b, 1928. 



Test planispiral, much compressed, concave on both sides, periphery 

 broadly curved; tubular chamber very gradually and uniformly in- 

 creasing in size with succeeding coils; wall thin, composed almost 

 entirely of cement, of a brownish color, very smooth and polished; 

 aperture semicircular, at the end of the tubular chamber. 



This species was originally described from the Lizard Springs 

 material, and also occurs in the later collections from the Hobson 

 clay of San Fernando. The material of the test is almost entirely 

 pure cement, although with a considerable magnification fragmen- 

 tary material of small size can be seen. 



