FOEAMINIFEEA OF THE ATLANTIC OCEAN. 



77 



Descnption. — Test elongate, subcylinderical, larger than others of 

 the genus, proloculum large, thick walled, tiibiiltrr chamber of lesser 

 diameter usually, irregularly constricted at intervals, walls very 

 tliick, coai-sely arenaceous, somewhat roughened; interior smoother; 

 aperture circular, at the distal end of the tube; color light grayish. 



Length, up to 20 mm. 



Distnbuiion. — This is very evidently a cold-water species, being 

 found under cold, deep water conditio]) s and also in shallow water 

 where temperatures are very low. In the North Pacific paper I 

 noted that at the one shallow-water station at which the tempera- 

 ture oven in September was but 30.4° F. In the Atlantic Albatross 

 material the species has occurred at but few stations, five scattering 

 stations from George Bank to the Virgmia Capes in small numbers, 

 depths 428 to 1,813 fathoms, bottom temperatures 36.° to 40° F. 

 Farther north, however, at two stations, D2453, 82 fathoms, and 

 D2458, 89 fathoms, m rather shallow water the temperatures were 

 29.7° and 29.5° F., respectively. At these stations in latitude 51° 

 and 52° N. m the mfluence of the Greenland current and floathig ice 

 the species is extremely abundant, making up a large part of the 

 bottom sample and could almost be called a " Ilyi^erammina suh- 

 nodosa bottom. ' ' Awermzew records it from the Arctic north of 

 Siberia and mentions that it is very characteristic of the Polar Sea. 

 Pearcey records it from the Antarctic. It is recorded from off Green- 

 land by Brady, who says that some of the finest specimens were 

 from this region. He records it off Brazil and at other places, mostly 



in deep water. 



Hyperammina subnodosa — material examined. 



HYPERAMMINA LAEVIGATA J. Wright. 



Plate 29, Jigs. -5, 6. 



Hyperammina elongata II. B. Bhady (part), Rep. Voy. Challcnfjer, Zoology, vol. 9, 



1884, p. 257, pi. 2.3, figs. 9, 10 (not 3, 7, 8).— Goes, Kongl. Svensk. Vet. Akad. 



Handl., vol. 25, No. 9, 1891, p. 17, pi. 4, fig. 55 (not 56-58).— Flint, Rep. 



U. S. Nat. Mu8., 1897 (1899), p. 270, pi. 10, fig. 2 (in part).— Rhumbler. 



Arch. Prot., vol. 3, 1903, p. 258 (part). 

 Tlyperammina elongata H. B. Brady, var. laevigata J. Wright, Proc. Roy. Irish 



Acad., ser. 3, vol. 1, 1891, p. 40fi, pi. 20, fig. 1.— Cushman, Bull. 71, U. S. 



Nat. Mus., pt. 1, 1910, p. 61, fig. 75 (in text). 



