FORAMINIFEBA OF THE ATLANTIC OCEAN. 



73 



which possibly [it] may belong." It may bo that this is after all not 

 identical with the Gulf of Mexico and Carribbean species. 

 Pearcey refei*s an Antarctic form to this species as a variety. 



Thurammina favosa — material examined. 



THURAMMINA COMPRESSA H. B. Brady. 



Plate 28, fig. 9. 



Thurammina compressa 11. B. Brady, Quart. .Toiirn. Micr. Sci., vol. 19, 1879, p. 46, 

 pi, 5, fig. 9; Rep. Voy. CMlenger, Zoology, vol. 9, 1884, p. 324, pi. 37, fig. 1. 



Thyrammina compressa Rhumbler, Arch. Prot., vol. 3, 1903, p. 238, fig. 70 (in 

 text). 



Brady describes this species as follows : 



Test rounded, compressed, sublenticular; with numerous perforated mammillate 

 protuberances arranged irregularly on the periphery. Walls thin, chitinoarenaceous; 

 color dark brown. 



Diameter, about one-fiftieth inch (0.5 mm.). 



' Distribution. — The type station, south of the Rockall Bank in 630 

 fathoms is the only record for tliis peculiar species. The following 

 note as well as the figure and description is from Brady: 



This also is a scarce modification of the type. It is distinguished by its membranous, 

 only slightly arenaceous test, and its compressed almost lenticular contour. It is 

 possible that the latter character may be in a measure accidental, and due to the 

 partial collapse of the more or less flexible walls, as not unfrequently occurs in other 

 chitino-arenaceous forms. * * * At the same time, the position of the mammilate 

 orifices, on the peripheral margin, and not on the lateral faces of the test, makes it more 

 likely.tliat the natural form is retained by the dried specimens. 



Subfamily 3. HYPERAMMININAE. 



Genus HYPERAMMINA H. B. Brady, 1878. 



RJiabdopleura? Dawson, Ann. Mag. Nat. Hist., ser. 4, vol. 7, 1871, p. 86. 



Hyperammina H. B. Bkady (type, H. elongata H. B. Brady), (part), Ann. Mag. 

 Nat. Hist., ser. 5, vol. 1, 1878, p. 433.— Butschli, in Bronn, Klassen und 

 Ordnungen Thierreichs, vol. 1, 1880, p. 193.— H. B. Brady, Rep. Voy. Chal- 

 lenger, Zoology, vol. 9, 1884, p. 257.— Riiumuler, Nachr. kongl. Gos. Wiss. 

 Gottingen, 1895, p. 82; Arch. Prot., vol. 3, 1903, p. 257.— Cushman, Bull. 71, 

 U. S. Nat. Mus., pt. 1, 1910, p. 60.— Rhumbler, Plankton Exped., Foramini- 

 feren, pt. 2, 1913, pp. 351, 381. 



Hyperammina -\- Bactrammina Eimek and Fickert, Zcitschr. Wiss. Zool., vol. 65, 

 1899, pp. 673, 675. 

 20173— IS 6 



