_ 
GOES: FORAMINIFERA. 87 
B, depressa p’Ors. 
B. depressa D’ORB., 1826, Tab. Méth., An. Se. Nat., VII. p. 298, No. 7, Mod. 91. 
B. depressa Br., 1884, Chall. Rep., IX. p. 145, Pl. IL Figs. 12, 15-17; Pl. II. Figs. 
1,2. 
B. depressa Scutums., 1891, Biloc. gr. fonds, Mém. Soc. Zool. Fr., IV. Pl. IX. Figs. 
48, 49. c 
B. depressa Gois, 1894, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. 9, p. 120, 
Pl. XXV. Figs. 921-925. 
This world-wide spread form attains in the depths of both oceans a high devel- 
opment. In the Pacific it assumes often a flat and expanded form with sharp 
edge, like Bil. seutella KARR. 
Pacific. 700-1200 fathoms. 
Gulf of Mexico. 200-1500 fathoms. 
ALLIED Forms :— 
1. B. murrhina Scuwae. 
B. murrhina Scuwae., 1866, For. Kar Nikobar, Novara Reise, Geol., Th. II. 
p. 208, Pl. IV. Fig. 15. 
B, depressa var. murrhyna Br., 1884, Chall. Rep., IX. p. 146, Pl. II. Figs. 10, 11. 
B. murrhyna Scutvums., 1891, Biloc. gr. fonds, Mém. Soc. Zool. Fr., IV. p. 165, 
Pi. IX. Figs. 52-54. 
B. depressa Park. & Jonss, 1865, N. Atl. & Arct. Oc., Philos. Transact., CLV. 
p. 409, Pl. XVII. Fig. 89. 
Too nearly allied to the type to deserve separate denomination. The 
chief difference from serrata consists in its deficiency of marginal crenu- 
lation, instead of which the last two segments are bordered with a smooth 
limbation. It is generally more ventricose than the type. The emargina- 
tion of the posterior end of the margin is a common feature with serrata, as 
also the oval or circular aperture. 
With the following variety in both seas. 
S 
2. B. serrata Bravy. 
B. depressa var. serrata Br., 1884, Chall. Rep., IX. p. 146, Pl. III. Fig. 3. 
B. serrata Scutump., 1884, Golfe de Gascogne, Feuilles Jeunes Natur., XIII. 
Pl. Ill. Fig. 3; Biloc. gr. fonds, 1891, Mém. Soc. Zool. Fr., IV. Pl. IX. 
Figs. 50, 51. 
B. serrata Gots, 1894, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. 9, 
p. 120, Pl. XXV. Fig. 926. 
Distinguished by its crenulated margins of the last two segments and its 
more or less circular aperture. The crenulation is sometimes very obsolete, 
and the form of the aperture and the emargination of the posterior end are 
the only features that may distinguish it from the type. Such a variety is 
exhibited in Ret. Rhizop. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX. 4, Pl. X. 
Figs. 366, 367, and by Brady, Chall. Rep., IX. Pl. IT. Fig. 15. 
Pacific. 1000-1200 fathoms. 
Caribbean Sea. 200-1000 fathoms. 
