DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 333 



TRUNCATULINA LOBATULA Walker and Jacob. 

 (Plate 76, fig. 4.) 



Planoconvex, the convexity on the inferior face; peripheral margin 

 rounded; segments rather numerous, only the final convolution visi- 

 ble below; walls stout and coarsely porous; sutures thickened with 

 clear shell-substance and more or less limbate near the umbilici; 

 aperture a long fissure at the upper and inner margin of the last 

 segments. Diameter, from 0.8 to 1.2 mm (^ 6 to -$ inch). 



Locality. Bahia, Brazil (station 2760), 1,019 fathoms. 



TRUNCATULINA WUELLERSTORFI Schwager. 

 (Plate 77, fig. 1.) 



Outline circular, much compressed, inferior face moderately convex, 

 superior face flat or slightly concave, peripheral margin sharp; com- 

 posed of numerous narrow curved segments arranged in about three 

 convolutions; walls coarsely porous; aperture regular. Diameter, 

 about 1.25 mm. ( inch). 



Localities. Gulf of Mexico, North Atlantic, and Panama Bay (sta- 

 tions 2150, 23-70, 2392, 2570, 2565, 2750, 2805), 25 to 2,069 fathoms. 



TRUNCATULINA UNGERIANA d'Orbigny. 

 (Plate 77, fig. 2.) 



Nearly equally convex on the two surfaces, peripheral margin thin. 

 Differs from T. wuellerstorfi in that the superior face is convex, the 

 segments shorter and less curved, and the walls less coarsely porous. 



Localities. Gulf of Mexico and coast of Brazil (stations 2078, 2393, 

 2400, 2760), 169 to 1,019 fathoms. 



TRUNCATULINA AKNERIANA d'Orbigny. 

 (Plate 77, fig. 5.) 



Circular, compressed, superior surface flat, inferior convex at the 

 margin, flat toward the center; margin rounded; a more or less deep 

 and extended fissure on the superior face between the last convolution 

 and the preceding one. Section shows the chambers of the last convo- 

 lution and a portion of the next. Diameter, about 1.25 mm. (- 2 A - inch). 



Localities. Gulf of Mexico and coast of Brazil (stations 2377, 2394, 

 2398, 2760), 210 to 1,019 fathoms. 



m 



TRUNCATULINA ROBERTSONIANA Brady. 



(Plate 77, fig. 3.) 



Superior surface nearly flat, inferior convex, but flattened toward 

 the center; margin thick and rounded; walls quite transparent, show- 

 ing clearly the convolutions and the outlines of the numerous seg- 

 ments; all the convolutions visible on the upper face, on the lower 



