10 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



GLOBIGERINA CONGLOBATA H. B. Brady. 



Plate 3, figs. 3-5; plate 10, figs. 1, 6. 



Globigerina conglobata H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 72; 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 603, pi. 80, figs. 1-5; 

 pi. 82, fig. 5. — H. B. Brady, Parker, and Jones, Trans. Zool. Soc., vol. 

 12, 1888, p. 225, pi. 45, fig. 13.— Egger, Abh. kon. bay. Akad. Wiss. 

 Munchen, CI. n, vol. 18, 1893, p. 368, pi. 13, figs. 55, 56.— Goes, Kongl. 

 Svensk. Vet. Akad. Handl., vol. 25, 1894, p. 86, pi. 14, figs.768, 769; 

 Bull. Mus. Comp. Zool., vol. 29, 1896, p. 66.— Flint, Ann. Rep. TJ. S. 

 Nat. Mus., 1897 (1899), p. 322, pi. 69, fig. 6.— Fornaslni, Mem. Accad. Sci. 

 1st. Bologna, ser. 5, vol. 7, 1899, p. 582, pi. 2, figs. 12-15; pi. 3, figs. 1-5.— 

 MrxLETT, Journ. Roy. Micr. Soc, 1903, p. 688.— Bagg, Proc. U. S. Nat. Mus., 

 vol. 34, 1908, p. 153. 



Description. — Test subglobular, early chambers arranged in a com- 

 pact spiral; in the adult the last three chambers form the last volu- 

 tion taking up nearly the whole surface of the test; wall strongly 

 reticulate; in pelagic specimens with delicate spines; aperture at the 

 inner margin of the chamber with several rounded accessory apertures 

 along the sutures between the chamber and the previous ones to 

 which it is adjacent. 



Diameter up to 1 mm. 



Distribution. — Brady records this as found in the North Pacific in 

 the Challenger surface tows as well as at two bottom stations, 214 in 

 500 fathoms and 224 in 1,850 fathoms. Bagg records it from 15 out 

 of 19 Albatross stations near the Hawaiian Islands in 275 to 1,544 

 fathoms. 



I have found the species to be abundant in material dredged by the 

 Albatross between San Francisco and the Hawaiian Islands and at a 

 great number of Nero stations wherever Globigerina ooze conditions 

 were encountered. It also occurs frequently in the Alert and Tus- 

 carora material. 



This is a very characteristic species and it is singular that it was 

 not found previous to the Challenger expedition. The globose form, 

 with the three chambers making up practically all the visible test 

 and the peculiar accessory apertural openings, will distinguish this 

 species from any others. 



Evidently this is one of the highest of the species of the genus. 

 It is often almost globose, the accessory apertural openings numerous 

 and large, especially in adult specimens. It is apparently a rare 

 species outside of the recent oceans, its occurrence as a fossil being 

 practically unknown. 



In the north Pacific material this is often the characteristic species 

 of the genus o 



