J-ORAMINIFERA OF THE ATLANTIC OCEAN. 



51 



tooth at either side, the whole in a rounded depression of the inner 

 face of the chamber; color white. 



Length about 0.5 mm. 



Distribution. — Type-specimen (U.S.N.M. No. 16275) from Alba- 

 tross station H79 in 821 fathoms (1,488 meters) in the Caribbean Sea. 

 Atlantic records for Pleurostomella are very few and it is interesting 

 to note that this species comes from a region which by other species 

 allies itself with the Pacific rather than with the Atlantic in general. 

 Brady's records for P. alternans which include this species are from 

 the Pacific. There is, however, one record in the volume on "Sum- 

 mary of Results" which gives P. alternans from station 35c, in 1,950 

 fathoms (3,566 meters), latitude 32° 15' N., longitude 65° 08' W. 

 This may be the same as the specimens which I have referred to P. 

 alternans^^ from off the Galapagos Islands. 



Pleurostomella acuminata — -material examined. 



Genus PAVONINA d'Orblgny, 1826. 



Pavonina d'Orbigny (type, P . jlahelliformis d'Orbigny), Ann. Sci. Nat., vol. 7, 

 1826, p. 260.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 

 374.— Chapman, The Foraminifera, 1902, p. 169.— Cushman, Bull. 71, U. S. 

 Xat. Mus., pt. 2, 1911, p. 30. 



Description. — Test calcareous, hyaline, perforate, many cham- 

 bered, the early chambers biserial, the later ones becoming uniserial, 

 broad, curved, in the type species finally becoming embracing, and 

 the embracing series each composed of one or more chambers; aper- 

 tures numerous on the peripheral margin. 



There seem to be two distinct species of this genus, the type species, 

 P. Jiabelliformis d'Orbigny, found in the Indo-Pacific, from Honolulu, 

 southward to Torres Strait and westward to Madagascar, and the 

 other found in the West Indies. 



PAVONINA ATLANTICA, new spedes. 



Plate 19, fig. 1. 



Description. — Test subtriangular, slightly longer than broad, ini- 

 tial end with a short spine, very much compressed, the sides carinate; 

 chambers comparatively few, the earliest ones alternating, biserial, 



le Cushman, Bull. 71, U. S. Nat. Mus., pt. 2, 1911, p. 50, figs. 81a, 6 (in text). 



