FOKAMINIFERA OF THE ATLANTIC OCEAN. 5 



SEABROOKIA EARLANDI (Wright). 



Plate 1, figs. 14-16. 



Millettia earlandi Wright, Ann. Mag. Nat. Hist., ser. 6, vol. 4, 1889, p. 448. 



Seabrookia earlandi Wright, Proc. Roy. Irish Acad., ser. 3, vol. 1, 1891, p. 

 477, pi. 20, figs. 6, 7. — Heron-Allen and Earland, Proc. Roy. Irish 

 Acad., vol. 31, pt. 64, 1913, p. 72, pi. 5, figs. 10-12.— Sidebottom, 

 Journ. Roy. Micr. Soc, 1918, p. 129. 



Description. — "Test thin and hyaline; segments nearly embracing, 

 protruding a little near the oral end, ovate, somewhat irregular in 

 shape, slightly carinate, unequally convex on the upper and under 

 sides; aperture a fissure extending the entire width of the narrow 

 end of the segment; chambers usually five in number." 



Length 0.30 mm. 



Distriiution. — Wright described this species from two stations off 

 the southwest coast of Ireland, 37^ fathoms (69 meters), off Castle- 

 town, County Cork, Ireland, and 345 fathoms (631 meters), latitude 

 51° 2' north, longitude 11° 27' west. Herron-Allen and Earland 

 record "a single quite typical specimen from Station 12" of the 

 Clare Island region. They also make the following note: "It is 

 much more abundant in some of the deeper Goldseeker dredgings 

 in the North Sea and the Norwegian fjords, and is undoubtedly a 

 deep-water form." The only other record seems to be that of Side- 

 bottom from the Australian region. The other species S. pellucida 

 H. B. Brady, is known only from the Indo-Pacific. 



No specimens of the genus have been noted in the Albatross 

 dredgings from the western Atlantic. 



Family 7. GLOBIGERINIDAE. 



Test composed of numerous chambers, usually much inflated, 

 arranged typically in a trochoid coil, but in some species becoming 

 planospiral; often umbilicate; wall calcareous and perforate, usually 

 with a more or less regular reticulation and in perfect specimens in 

 some species with long slender spines ; aperture either large and simple 

 or with numerous accessory openings. 



This family is represented by comparatively few genera and 

 species, yet in individuals they are probably the most abundant and 

 widely distributed of all the Foraminifera. They make up a very 

 high percentage of the Glohigerina-ooze which covers a large propor- 

 tion of the bottom of the ocean basins down to 2,000 or 2,500 fathoms 

 (2,658 to 4,572 meters). Fossil species in the Cretaceous and Ter- 

 tiary often make up a large percentage of certain limestones, show- 

 ing the abundaifce of members of this family through various periods 

 of later geological time. 



