NO. 2 LALICKER AND MCCULLOCH : TEXTULARIIDAE 131 



of the last chamber, in a slight re-entrant. Length of holotype, 0.74 mm. ; 

 maximum width, 0.40 mm. ; thickness, 0.27 mm. 



Holotype (AHF no. 25) from Hancock Expedition Station 418, 

 Darwin Bay, Tower Island, Galapagos, depth 17 fms. 



This species is more like Textularia articulate d'Orbigny than any 

 other. It differs from that species in its much smaller size, more slender 

 outline, and in the less oblique suture lines. 



Distribution. — This species has not been noted at any other station, 

 but is abundant at the type locality. 



Textularia lythostrota (Schwager) 



Plate 15, Figs. 16a, b, c 



Plecanium lythostrota Schwager, Novara-Exped., Geol. Theil, vol. 2, 

 1866, p. 194, pi. 4, figs. Aa-c. 



Textularia sagittula Defrance, var. jugosa Millett, Journ. Roy. 

 Micr. Soc, 1899, p. 561, pi. 7, fig. 8. 



Textularia ?nilletti Cushman, U. S. Nat. Mus. Bull. 71, pt. 2, 1911, 

 p. 13, figs. 18, 19 (in text) ; Heron- Allen and Earland, British Antarctic 

 Exped., ZooL, vol. 6, 1922, p. 118. 



Spiroplectammina milletti Cushman, U. S. Nat. Mus. Bull. 161, 

 1932, p. 7, pi. 1, figs. 5a, b. 



Test compressed, somewhat longer than broad, subrhomboidal in 

 front view, subrectangular in top view, thickest in apertural chambers, 

 periphery acute ; chambers numerous, very low and broad, the upper mar- 

 gin of each one somewhat thickened and coarsely arenaceous, the lower 

 portion concave and less roughened, so that the surface of the test is com- 

 posed of an alternating series of raised ridges and smoother depressions; 

 wall coarsely arenaceous, composed of calcareous fragments and much 

 calcareous cement; aperture a low, narrow opening at the inner margin 

 of the last-formed chamber, in a deep re-entrant. 



The initial end of this species is rounded, making it appear much like 

 a Spiroplectammina. However, a detailed examination with dilute acid of 

 several specimens of this species from the Pliocene sediments of New 

 Guinea and from the Pacific Ocean shows clearly that the initial portion 

 is not planispiral. 



This species has been recorded from Pliocene sediments in Kar Nico- 

 bar and New Guinea. It has been noted at several localities in the Pacific 

 Ocean and is present at the following Hancock Expedition stations : 482, 

 487; and the Manila locality. 



