12 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.72 



SIPHONINELLA CLAIBORNENSIS Cushman and Howe 



Plate 4, figs. 5 a^c 



SipJioninella claibornensis Cushman and Howe, Contrib. Cushman Lab. Foram. 

 Res., vol. 3, pt. 2, 1927, p. 120, pi. 24, figs. 8-10. 



Test in the early portion trochoid, unequally biconvex, the ventral 

 side more convex than the dorsal, in later growth uncoiled in the 

 last two chambers ; periphery of the earlier portion strongly carinate, 

 the carina divided into tooth-like portions, usually coalescing and 

 typically with an angle in each process, later chambers slightly 

 rounded and without the keel ; sutures somewhat limbate, 'flush on 

 the dorsal side, very slightly depressed on the ventral; wall very 

 coarsely perforate, especially on the dorsal side; apertural end 

 with a distinct lip, a slightly constricted neck and narrow elongate 

 aperture. 



Length 0.35 mm.; breadth 0.25 mm.; thickness 0.10 mm. 



The types of his species are from the Claiborne Eocene of 

 Louisiana. 



SIPHONINELLA SOLUTA (H. B. Brady) 



Truncatulina soluta H. B. Brady, Rep, Voy. Challenger, Zoology, vol. 9, 1884, 



p. 670, pi. 96, figs. 4 ch-c. 

 Siphothinella soluta. Cushman, Contrib. Cushman Lab. Foram. Res., vol. 3, pt. 1, 



1927, p. 77, pi. 16, fig. 13. 



Test with all but the last two or three chambers trochoid, close- 

 coiled, the last ones becoming uncoiled, periphery acute, with a dis- 

 tinct keel, tubulated; wall of the early chambers smooth, later with 

 a few blunt spines with a row of spines along the sutures; aperture 

 narrowly elliptical with a short constricted neck and distinct lip. 



Length 0.38 mm. ; breadth 0.25 mm. ; thickness 0.10 mm. 



The types of this species were from Challenger Station 24 off the 

 West Indies. 



In all its characters, this is a very distinct species from that of 

 the Claiborne Eocene of Louisiana. 



Genus SIPHONINOIDES Cushman, 1927 



Siphoninoides Cushman, Contrib. Cushman Lab. Foram. Res., vol. 3. pt. 1, 

 1927, p. 77, pi. 16, fig. 15 (genotype Truncatulina echinata H. B. Brady). 



Truncatulina H. B. Brady (part) Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 670, pi. 96, figs. 9-14. 



Test globular, irregularly trochoid; wall calcareous, perforate; 

 aperture generally circular with a short neck and flaring lip. 



The species of this genus are known only from the Tertiary and 

 Recent. In some of the characters, the genus resembles SiphoniTm, 

 and in others Sphaeroidina. A study should be made of the very 



