AET. 20 THE GENUS SIPHONINA AND OTHER GENERA CUSHMAN 11 



Diameter 0.30 mm.; thickness 0.15 mm. 



Holotyfe.— {C2it. No. 20311, U.S.N.M.) from Albatross Station 

 D5242, lat. 6° 51' 53'' N.; long. 126° 14' 10" E.; in 215 fathoms off 

 the Philippines. 



In some respects, the small size, finely reticulate narrow keel and 

 lack of neck this species most closely resembles the early Eocene 

 species of America. This relationship of the living species of the 

 Philippine region has been noted among many other genera and 

 species of the foraminifera. 



SIPHONINA BRADYANA. new species 



Plate 1, figs. 4 a-c 



Truncatulina reticulata H. B. Brady (part) (not Czjzek), Rep. Voy. Challenger, 

 Zoologj^ vol. 9, 1884, pi. 96, fig. 8. 



Test nearly equally biconvex, periphery acute with a broad thin 

 carina somewhat fimbriate, but the fine tubules not reaching to the 

 edge of the keel, the outer half of which is clear ; chambers about five 

 in the last-formed volution, not inflated; sutures distinct, limbate, 

 not depressed; wall coarsely perforate, smooth; aperture elliptical, 

 with a broad flaring lip but very short neck. 



Diameter 0.60 mm. ; thickness 0.28 mm. 



Holotype.— {Cait. No. 20309, U.S.N.M.) from Albatross Station 

 D2352 in 463 fathoms, Lat. 22° 35' N. ; long. 84° 23' W. 



Brady figured this species from Challenger Station 24 off the 

 West Indies. 



It is related to Siphonina pulchra Cushman but has developed a 

 very wide keel among other characters. It is apparently limited to 

 the West Indian region. 



Genus SIPHONINELLA Cushman, 1927 



Siphoninella Cushman, Contrib. Cushman Lab. Foram. Res., vol. 3, pt. 1, 1927, 

 p. 77, pi. 16, fig. 13 (Genotype Truncatulina soluta H. B. Brady). 



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

 p. 670. 



Test in the early stages similar to /Siphonina, in the later' cham- 

 bers becoming uncoiled, the aperture nearly terminal, slightly on 

 the ventral side, with a neck and lip. 



This genus is very evidently the attempt of the close coiled trochoid 

 Siphonina to take on an uncoiled habit. The earliest known species 

 occurs in the Claiborne Eocene of Louisiana and the other is now 

 living off the West Indies. 



