334 REPORT OF NATIONAL MUSEUM, 1897. 



face the final convolution leaves exposed some of the earlier segments; 

 walls coarsely porous; color often a more or less deep shade of brown. 

 Diameter, about 0.7 mm. (-^ inch). 



Localities. — North Atlantic, Gulf of Mexico, Caribbean Sea, coast of 

 Brazil (stations 2568, 2352, 2392, 2394, 2760), 463 to 1,781 fathoms. 



TRUNCATULINA TENERA Brady. 



(Plate 77, fig. 4.) 



Small, discoidal, inferior face the more convex; peripheral margin 

 acute and slightly lobulated; visible segments on the inferior face six 

 or seven; convolutions about three of nearly equal width; sutures 

 slightly depressed, straight and radial; aperture a short curved fissure 

 with thickened lip, at the inner margin of the final segment. Diame- 

 ter, about 0.5 mm. (g 2 ^- inch). 



Locality. — West coast of Patagonia (station 2784), 194 fathoms. 



TRUNCATULINA PYGM^EA Hantken. 



(Plate 77, fig. 6.) 



Very small, slightly convex superiority, quite convex inferiorily, and 

 depressed at the center; rounded near the margin, but with a rather 

 sharp edge; sutures sometimes thickened with clear shell substance. 

 Diameter, about 0.36 mm. (^ inch). 



Locality y — Gulf of Mexico (station 2460), 169 fathoms. 



TRUNCATULINA ROSEA d'Orbigny. 

 (Plate 78, fig. 2.) 



Superior face short conical, with rounded apex ; inferior face flat or 

 slightly convex; sutural lines very indistinct; color pink to bright rose 

 color. Section shows chambers of the last convolution, and the thick 

 deposit of pink shell substance about the center of the coil. Diameter, 

 about 0.5 mm. (- 5 - inch). 



Locality. — Not recorded. 



TRUNCATULINA PR^CINCTA Karrer. 

 (Plate 78, fig. 1.) 



Comparatively large, thick, biconvex, convexity greatest on the 

 inferior side; margin obtuse; sutures raised by a thick deposit of clear 

 shell substance, especially on the lower side and near the umbilicus. 

 Diameter, about 1.5 mm. (-^ inch). 



Localities.— Gulf of Mexico (stations 2399, 2400) ; 169 and 196 fathoms. 



TRUNCATULINA RETICULATA Czjzek. 

 (Plate 78, fig. 3.) 



Biconvex, the convexity about equal on the two sides; margin thin 

 and broadly carinate; walls thick, transparent, and rather coarsely 

 perforated along the borders of the segments. The tubuli, in certain 



