62 BULI.ET1N 100, UNITED STATES NATIONAL MUSEUM. 



Ammolagena ciavata — Material examined. 



> See No. 1 above. 



Genus AMMODISCUS Reuss, 1861. 



AMMODISCUS INCERTUS (d'Orbigny). 



Plate 5, figs. 1, 2. 



Operculinu incerta d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, 

 "Foraminif^res," p. 49, pi. 6, figs. 16, 17. 



Ammodiscus incertus H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 330, pi. 38, figs. 1-3.— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 278, pi. 23, 

 fig. 2.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 73, figs. 95, 96fl, 

 h (in text); Bull. 104, U. S. Nat. Mus., pt. 1, 1918, p. 95, pi. 39. 



Arnmodisais tenuis H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, p. 51; 

 Rep. Voy. Clmllenger, Zoology, vol. 9, 1884, p. 332, pi. 38, figs. 4-6.— Flint, 

 Rep. U. S. Nat. Mus., 1897 (1899), p. 279, pi. 23, fig. 1. 



Specimens of this species were very numerous and were found 

 at a large number of stations, especially in the southern portion 

 of the area. Depths vary from 24-1,570 fathoms (44-2,871 meters) 

 and bottom temperatures, were recorded, from 38.2° to 52.0° F. 

 (3.4° C. to 11.1° C). At several stations where a number of speci- 

 mens were found a record was kept of the number of microspheric 

 and megalospheric specimens, as follows: 



