FORAMINIFERA OF THE ATLANTIC OCEAN 11 



NONION BARLGEANUM (Williamson) 



Plate 4, figure 5 



Nonionina barleeana Williamson, Rec. Foram. Gt. Britain, 1858, p. 32, pi. 3, 

 figs. 68, 69. 



Test planispiral, bilaterally symmetrical, much compressed; pe- 

 riphery rounded, umbilici depressed and open; chambers numerous, 

 12 or more in the last-formed coil, of rather uniform shape and size; 

 sutures curved, slightly limbate, not depressed; wall smooth, coarsely 

 perforate; aperture semicircular, at the base of the apertural face. 



Diameter slightly less than 0.65 mm.; thickness, 0.18 mm. 



Williamson's specimens were from Skye, Stornoway, Shetlands, 

 and Scarborough. Such forms have been recorded from about the 

 British Isles as Nonionina umhilicatula. With the great uncertainty 

 existing in regard to the latter species, it seems best to use Williamson's 

 name for this cold-water species. 



NONION LABRADORICUM (Dawaon) 



Plate 4, figures 6-12 



Nonionina labradorica Dawson, Can. Nat., vol. 5, 1860, p. 191, fig. 4. — 



Jones, Parker, and H. B. Brady, Crag Foram., Pal. Soc, vol. 19, 1866, 



pi. 2, figs. 44, 45. 

 Nonionina scapha (FicHTELand Moll), var. labradorica Dawson, Can. Nat., 



vol. 5, 1870, p. 177, fig. 5; Amer. Journ. Sci., ser. 3, vol. 1, 1871, p. 206, 



fig. 5; Ann. Mag. Nat. Hist., ser. 4, vol. 7, 1871,«p. 86. fig. 5; Can. Nat., 



vol. 6, 1872, p. 255, pi. 3, fig. 4. 

 Nonion labradorica Cushman, Bull. Scripps Instit. Oceanography, Tech. 



Ser., vol. 1, 1927, p. 148, pi. 2, figs. 7, 8. 

 Nonionina scapha Morton (not Fichtel and Moll), Proc. Portland Soc. Nat. 



Hist., vol. 2, 1897, p. 121, pi. 1, figs. 23 a, b. 



Test small, planispiral, completely involute, bilaterally symmet- 

 rical, periphery bluntly angled, apertural face very broadly triangular, 

 the sides convex; chambers few, rapidly increasing in size as added; 

 sutures distinct, curved, very slightly if at all depressed, not lim- 

 bate; wall thin, finely perforate; aperture, a narrow sUt at the base 

 of the apertural face. 



Length, 0.50 mm.; breadth, 0.30 mm.; thickness, 0.30 mm. 



This is an abundant species in the cold waters from northern New 

 England northward, and occurs also off the western coast of America. 

 Dawson's specimens were from the Gulf of St. Lawrence. 



The apertural face is very broadly triangular. 

 6299&— 30 2 



