68 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



earlier fossil forms as has been done by some authors does not seem to 

 be the best treatment of the recent species. 



A study of the Albatross and other material from the western 

 Atlantic shows that our species and varieties are constant in their 

 characters and have very definite areas of distribution which follow 

 those of other species of the foraminifera. 



GAUDRYINA SCABRA H. B. Brady. 



Plate 11, figs. 6, 7. 



Gaudryina pupoules H. B. Brady (not G. pupoides d'Orbigny, 1840), Ann. Mag. 



Nat. Hist., ser. 4, vol. 6. 1870, p. 300, pi. 8, fig. 5. 

 Gaudryina scabra H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 381, 



pi. 46, fig. 7.— CusHMAN, Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 146, pi. 



28, fig. 5. 



Description. — Test elongate, tapering, somewhat compressed, in- 

 creasing in breadth from the subacute apical end to the much broader 

 apertural end, triserial portions short but distinct, rounded, biserial 

 portion broadly elliptical in transverse section; chambers in the 

 biserial portion usually consisting of about five pairs, slightly inflated, 

 distinct; sutures distinct, slightly depressed, wall rather coarsely 

 arenaceous with numerous broken sponge spicules and a considerable 

 portion of cement; aperture at the base of the inner margin of the 

 chamber, arched, simple; color deep reddish-brown. 



Length up to 2 mm. 



Distribution. — From the Challenger material Brady records this 

 species from but two stations; 23, 450 fathoms (823 meters), latitude 

 18° 26' N., longitude 63° 29' W., and 24, 390 fathoms (713 meters), 

 latitude 18° 38' 30" N., longitude 65° 05' 30" W. This species has 

 been widely recorded by numerous authors, but an examination of 

 their figures when given show that very few o>f these are at all like the 

 typical specimens figured and described by Brady from the West 

 Indies. An examination of the abundant western Atlantic material 

 has been surprising in that Gaudryina scabra has occurred birt twice, 

 once at Albatross station D2751, 687 fathoms (1,256 meters), close 

 to the two Challenger stations given by Brady. There are also two 

 specimens from Albatross station D2150, in 382 fathoms (697 meters) 

 in the Caribbean Sea. This therefore seems to be a species developed 

 in the Caribbean and possibly adjacent areas in water of several hun- 

 dred fathoms in depth, and so far as material shows is confined to this 

 region. 



Gaudryina scabra — material examined. 



