rART. 6 FORAMINIFERA: POLYMORPHINIDAE — CUSHMAN AND OZAYf A Oo 

 PYRULINA LABIATA (Schwager) 



Plate 12, figures 4 a, b 



Polymorphina lahiala Schwager, iVo^ara-Exped., Geol. Theil, vol. 2, 1866, 

 p. 246, pi. 7, fig. 90. 



Test elongated, acute at both ends; chambers elongated, overlap- 

 ping, arranged in a nearly triserial series from the beginning to the end, 

 growth rapid; sutures not depressed, not distinct; wall smooth, rather 

 thin; aperture radiate. 



Length, 0.75-0.80 mm.; breadth, 0.30-0.33 mm.; thickness, 

 0.30-0.33 mm. 



Pyrulina labiata in its general feature resembles P. cylindroides, 

 but its chambers are arranged in a triserial series even in the later 

 stages, and the chambers are slightly shorter than those of the latter 

 species. Schwager's figure of the species does not clearly show the 

 arrangement of chambers, especially that of the early stage. 



Distribution. — Schwager recorded the present species from the 

 Pliocene, upper clay of Kar Nicobar. We have specimens from the 

 Pliocene of Fiji. 



PYRULINA VICKSBURGENSIS (Cushman) 



Plate 13, figures 2 a-c 



Polymorphina vicksburgensis Cushman, U. S. Geol. Survej", Prof. Paper 

 129-F, 1922, p. 133, pi. 31, fig. 2; Prof. Paper 133, 1923, p. 33. 



Test elongate, fusiform, broadest near the initial end, which is 

 subcircular in transverse section, the later portion becoming com- 

 pressed and narrower, initial end bluntly pointed, or with a short 

 spine; chambers becoming shorter toward the apertural end in the 

 adult and arranged in an almost biserial series; surface smooth or 

 with very slight longitudinal costae; sutures not depressed but often 

 standing out as clearer areas in side view; aperture radiate. 



Length, 1.50 mm. or less; breadth, 0.40 mm. 



Type specimen from Station 6451, Mint Spring Bayou, Vicksburg, 

 Miss. This species occurs also at Station 6448, Glass Bayou, Vicks- 

 burg, Miss. 



This seems to be different from the other described species of this 

 genus, and may be distinguished especially by the cuspidate initial 

 end and the peculiar change in shape from the rounded early portion 

 to the narrow, compressed last-formed portion. 



PYRULINA EXTENSA (Cushman) 



Plate 12, figures 5 a-c 



Polymorphina longicollis H. B. Brady-, Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 672, pi. 73, figs. 18, 19.— Egger, Abhandl. kon. bay. Akad. Wiss., 

 Miinchen, CI. II, vol. 18, 1893, p. 310, pi. 9, fig. 21.— Cushman, Bull. 71, 

 U. S. Nat. Mus., pt. 3, 1913, p. 90, pi. 41, figs. 1-3. 



Polymorphina extensa Cushman, Bull. 71, U. S. Nat. Mus., pt. 3, 1913, p. 90, 

 pi. 41, figs. 1-3; Bull. 104, pt. 4, 1923, p. 156, pi. 41, figs. 7, 8. 



