FORAMINIFEKA OF THE NORTH PACIFIC OCEAN. 



39 



a ^-^_>^ b **zs c 



Fig. 41.— Truncatulina pygmaea Hantken. (Adapted from Brady.) a, 



DORSAL VIEW; b, VENTRAL VIEW; C, SIDE VIEW. 



formed whorl; aperture an elongate slit at the inner margin of the 

 chamber, ventrally from the periphery. 



Diameter 0.30-0.65 mm. 



Distribution. — In the Challenger Report Brady records this species 

 from five stations in the North Pacific ranging in depth from 1,850 

 to3,125fathoms. 

 Bagg records it 

 from one Alba- 

 tross station, 

 H4502 in 1,342 

 fathoms off the 

 Hawaiian Is- 

 lands. 



I have had ma- 

 terial of this species from several Nero stations, 10 in 2,098 fathoms, 

 124 in 1,726 fathoms, 990 at Guam in 859fathoms and several stations 

 between Guam and Yokohama, depths ranging from 1,088 to 2,180 

 fathoms. 



From all the North Pacific records this species seems to occur 

 most frequently at depths over 1,500 fathoms. 



TRUNCATULINA PILECINCTA (Karrer). 



Plate 26, fig. 2. 



Rotalia praecincta Karrer, Sitz. Akad. Wiss. Wien, vol. 58, 1868, p. 189, pi. 5, 



fig. 7. — Seguenza, Atti Accad. Lincei, ser. 3, vol. 6, 1897, pp. 56, 64. 

 Truncatulina prsecincta H. B. Brady, Rep. Voy Challenger, Zoology, vol. 9, 1884, 

 p. 667, pi. 95, figs. 1-3.— Terrigi, Mem. Com. geol. Italia, vol. 4, 1891, p. 107, 

 pi. 4, fig. 11. — Egger, Abh. kdn. bay. Akad. Wiss. Miinchen, CI. n, vol. 18, 

 1893, p. 403, pi. 16, figs. 51-53. — Fornasini, Mem. Accad. Sci. Inst. Bologna, 

 ser. 5, vol. 5, 1895, p. 12, pi. 4, fig. 36.— Flint, Rep. U. S. Nat. Mus., 1897 



(1899), p. 334, pi. 78, fig. 

 1. — Millett, Journ. Roy. 

 Micr. Soc, 1904, p. 494.— 

 Chapman, Trans. New 

 Zealand Inst., vol. 38, 

 1905, p. 104.— Bagg, 

 Proc. U. S. Nat. Mus., 

 vol. 34, 1908, p. 158. 



Description. — Test free, 

 ventral side strongly con- 

 vex, dorsal side but slightly so ; comparatively large, peripheral mar- 

 gin bluntly rounded; chambers very numerous, about twelve in the 

 last-formed whorl, short and broad, especially on the dorsal side where 

 four or more whorls may be visible, slightly oblique ; sutures and periph- 

 ery marked by clear shell material often appearing as distinct ridges 



70175°— Bull. 71, pt. 5—15 4 



C 



Fig. 42.— Truncatulina pr^cincta (Karrer). (Adapted 

 from karrer's type figure.) a, ventral view; 6, dor- 

 SAL view; C, SIDE VIEW. 



