FORAMINIFERA OF THE ATLANTIC OCEAN. 



143 



FRONDICULARIA SAGITTULA Vanden Broeck. 



Plate 21, fig. 2. 



Frondicularia alata D'Orbigny, vai'. sayittula Vanden Broeck, Ann. Soc. 

 Belg. Micr., vol. 2, 1S76, p. 113, pi. 2, figs. 12, 14. 



Description. — Test flattened, triangular in outline; chambers at 

 the initial end gradually increasing in length posteriorly so as to 

 form an angle from the initial chamber as its apex, apertural end 

 bluntly pointed, chambers narrow, of uniform width throughout, 

 the initial ends often with short blunt conical spines extending 

 backward ; wall smooth ; sutures strongly limbate, distinct, sometimes 

 slightly raised above the general surface; aperture terminal, radiate. 



Length up to 4 mm. 



Distrihution. — This species, originally described by Vanden Broeck, 

 is a variety of F. alata D'Orbigny. It -occurs sparingly in the Gulf 

 of Mexico, and in a still more definite form in the Bowden Marl, 

 Bowden, Jamaica. 



The following variety is more common. 



Frondicularia sagittula — material examined. 



FRONDICULAEIA SAGITTULA Vanden Broeck, var. LANCEOLATA Vanden Broeck. 



Plate 20, fig. 4 ; pi. 21, fig. 1. 



Frondicularia alata D'Orbigny, var. lanceolata Vanden Broeck, Ann. 



Soc. Belg. Micr., vol. 2, 1876, p. 117, pi. 2, fig. 13. 

 Frondicularia alata H. B. Brady (not D'Orbigny), Rep. Voy. Challenger, 



Zoology, vol. 9, 1884, p. 522, pi. 65, figs. 20-23 ; pi. 66, figs. 3-5.— Goes, 



Bull. Mus. Comp. Zool., vol. 29, 1896, p. 65.— Flint, Rep. U. S. Nat. 



Mus., 1897 (1899), p. 313, pi. 59, fig. 1.— Cushman, Publ. 291, Carnegie 



Inst. Washington, 1919, p. 36, pi. 8, fig. 1. 

 Nodosarina complanaia Goiis (not Frondicularia complanata Defrance), 



Kongl. Svensk. Vet. Akad. Handl., vol. 19, No. 4, 1882, p. 56, pi. 3, 



figs. 62-64. 



Description. — Variety differing from the typical in the form which 

 is much broader, the base usually either a straight line or the 

 chambers not reaching to the base, giving it a rounded form ; cham- 

 bers usually broader than the typical and often with a single stout 

 spine developed from the proloculum. , 



Length up to nearly 5 mm. 



Distrihution. — This variety which is described by Vanden Broeck 

 from off the Barbadoes in 84 fathoms (153 meters), is much more 



