28 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Description. — Test elongate, the early portion composed of a biserial 

 group of chambers, considerably flattened and with the sutures 

 clearly marked externally; chambers progressively broader; later 

 portion composed of a uniserial group of chambers, rounded, usually 



less in width than the biserial por- 

 tion; wall usually coarsely arena- 

 ceous, sometimes of fine material 

 and nearly smooth; aperture in 

 the early portion as in Textularia, 

 an elongate slit between the base 

 of the inner margin of the chamber 

 and the adjacent wall of the pre- 

 ceding chamber, in the later por- 

 tion rounded and in the middle 

 of the terminal face of the cham- 

 ber; color white or light gray. 

 Length about 1 mm. 

 Distribution. — In 

 the North Pacific this 

 species is recorded by 

 Brad} T in shallow 

 water from three lo- 

 calities: China Sea; 

 Hongkong Harbor, 

 7-10 fathoms; Inland Sea, Japan, 15 fathoms. 

 Outside the North Pacific it is widely distributed. 



BIGENERINA DIGITATA d'Orbigny. 



Bigenerina digitata d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 

 262; Modeles, 1826, No. 58.— H. B. Brady, Trans. Linn. 

 Soc, London, vol. 24, 1864, p. 468, pi. 48, fig. 8; Nat. Hist. "./ 



Trans. Northumberland, vol. 1, 1865-67 (1867), p. 102, pi. I I , 



12, fig. 7. — Parker, Jones, and H. B. Brady, Ann. Mag. '*-^' 



Nat. Hist., ser. 3, vol. 16, 1865, p. 28, pi. 2, fig. 61.— H. B. 

 Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 370, ,'~ : --\ 



pi. 44, figs. 19-24. — Wright, Proc. Roy. Irish Acad., ser. 3, ; s , ' \ 



vol. 1, 1891, p. 471. 



Textularia agglutinans, var. digitata Parker and Jones, Philos. 

 Trans. Roy. Soc, vol. 155, 1865, p. 371, pi. 17, fig. 81. 



Description. — Test fusiform or cylindrical, elongate, 

 rounded in cross section, the early portion consisting of 

 a number of chambers arranged biserially, but circular 

 in cross section; sutures somewhat indistinct; apex 

 bluntly rounded; later portion consisting of a number of chambers 

 arranged uniserially; division between the two portions not marked 

 by a difference in size; wall rather coarsely arenaceous, but the 

 particles neatly cemented with a reddish brown cement to form 



Figs. 40-48.— Bigenerina nodosaria. X 35. 

 40, a, front view; b, END view. 47, a, FRONT 

 view; b, end view. 48, longitudinal sec- 

 tion OF THE TEST (AFTER BRADY). 



^^ b 



Fig. 49.— B ige- 

 nerina digi- 

 tata . X 30. 



a, FRONT view; 



b, APERTURAL 



view. 



