88 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
3. B. obesa Reuss. Plate IX. Figs. 3, 4. 
B. obesa Russ, 1864, Oberoligocan, Wien. Ak. Sitz. Ber., L. p. 450, Pl. V. Fig. 7. 
2 B. oblonga v'OrB., For. Cuba, 1839, p. 163, Pl. VIII. Figs. 21-23. 
2 M. (Bil.) ringens PARK. & JONES, 1865, (ex parte,) North Atlantic & Arct. Oc., 
Philos. Transact., CLV. p. 409, Pl. XV. Fig. 42. 
Exhibits one of the several intermediate forms between simplex and 
depressa. Not seldom it assumes an oblong shape and merges into 
B. elongata D'ORB. The aperture is usually a more or less straight or even 
a u formed slit ; the margin is more rounded and less prominent than in 
B. simplex. 
Pacific. 772-885 fathoms. 
Gulf of Mexico. 769 fathoms. 
B. saccata Gois. 
Plate IX. Figs. 5-8. 
B. saccata Goiis, 1804, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. 9, p. 121, 
Pl. XXV. Fig. 028. 
A marginally compressed usually tubulate form, with the last segment flask- 
shaped. The penultima segment often has its margin detached from the 
last one, leaving to appearance a good deal of the antepenultima segment; the 
aperture is nearly round on a short neck, and often with bifurcated tongue. 
The surface is not so much polished as usually in some of its congeners. 
Length 1.10 mm. 
Caribbean Sea. 320 fathoms (Goés). 
B. quadrangularis Goiis. 
Plate IX. Figs. 9-12. 
B. quadrangularis Goiis, 1894, Arct. & Scand. Foramf., Sv. Vet. Ak. Hal, XXV. 9, 
p. 121, Pl. XXV. Fig. 929. 
Gois, 1882, Ret. Rhizop. Caribb. Sea, Sv. Vet. Akad. Hdl., XIX. 4, Pl. IX. Figs. 
348, 349. 
This singular Biloculina has not been met with in the * Albatross” dredg- 
ings, but in my own collections from the Caribbean Sea a few samples are extant. 
Its marginal section has a tetragone circumference, and often the margin of the 
last two segments is carinate, the back of these being provided with one or 
two converging keels and often somewhat scooped out; the aperture short 
fibula-formed. Length 1 mm. 
Caribbean Sea. 320 fathoms (Goés). 
VERTEBRALINA. v’Ors. 
V. conico-articulata Barscn. 
Nautilus conico-articulatus Barson., 1791, Conchyl. Seesandes, p. 3, Pl. III. Fig. 11. 
Articulina nitida D'OrB., Tab. Méth., An. Sc. Nat., VII. p. 300, No. 1, Mod. 22. 
