DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 317 



meiit comparatively Hat and triangular; surface smooth; aperture at 

 the dorsal angle. Length, about 2 mm. ( ,\, inch). 



Localities. — Oft' coast of Georgia and Gulf of Mexico (stations 2415, 

 2399), 440 and 190 fathoms. 



CRISTELLARIA GIBBA d'Orbigny. 

 (Plate 64, fig. 1.) 



Sublenticular, equally biconvex, smooth, characterized by the some- 

 what inflated and protuberant final segment, and its contracted septal 

 face. Diameter, about 1 mm. (-^ inch). 



Localities. — North Atlantic (three stations), Gulf of Mexico, coast of 

 Yucatan (stations 2243, 2312, 2415, 2379, 2400, 2354), 63 to 1,467 fathoms. 



CRISTELLARIA ARTICULATA Reuss. 

 (Plate 64, fig. 2.) 



Test rotaliform, or sometimes with the last few segments more or less 

 evolute; margin rounded or subcarinate; segments slightly inflated; 

 aperture radiate, in the protuberant end of the last segment. 



Localities. — Gulf of Mexico and oft* the coast of Georgia (stations 

 2399, 2400, 2416), 169 to 276 fathoms. 



CRISTELLARIA ROTULATA Lamarck. 

 (Plate 64, fig. 4.) 



Lenticular, biconvex, smooth; margin sharp, but not carinate; 

 formed of about three convolutions, the last entirely inclosing the 

 others; walls thick and strong. Section shows well the form and 

 arrangement of the chambers and their apertures and the structure 

 of the shell. Diameter, 1.5 to 2.5 mm. (-^ to ^ inch). 



Localities. — Caribbean Sea, North Atlantic, and Gulf of Mexico (sta- 

 tions 2150, 2415, 2399), 196 to 440 fathoms. 



CRISTELLARIA VORTEX Fichtel and Moll. 

 (Plate 65, fig. 1.) 



Lenticular, biconvex, smooth, with a sharp noncarinate margin; dis- 

 tinguished by the long helicoid curve of the sutures marking the out- 

 line of the chambers. Diameter, about 1 mm. (^V inch). 



Localities. — North Atlantic and Caribbean Sea (stations 2416, 2357), 

 276 and 130 fathoms. 



CRISTELLARIA ORBICULARIS d'Orbigny. 

 (Plate 64, fig. 3.) 



Form of the shell and the shape and arrangement of the chambers 

 same as in C. vortex. Differs only in having the margin extended into 

 a distinct wing or keel. 



Locality.— Gulf of Mexico (stations 2377, 2400), 210 and 169 fathoms. 



