DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 331 



PULVINULINA ELEGANS d'Orbigny. 

 (Plate 75, fig. 1.) 



Lenticular, about equally convex on the two sides, smooth ; periph- 

 eral margin rounded; sutures well marked but not elevated or 

 depressed; walls clear, transparent, and beautifully marked by opaque- 

 white, broad, wavy lines and irregular dots; aperture at the inner 

 margin of the final segment, a second aperture is found in most speci- 

 mens as a linear slit just beneath the peripheral margin of the last 

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



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

 tions 2352, 2394, 2570, 2805), 51 to 1,813 fathoms. 



PULVINULINA PARTSCHIANA d'Orbigny. 

 (Plate 75, fig. 3.) 



Differs from P. elegans in its smaller size, the tendency to limbation 

 of the sutures, and especially in the absence of the variegated markings 

 which give the specific name to the former species. Diameter, about 

 0.75 mm. (^ inch). 



Locality. Gulf of Mexico (station 2394), 420 fathoms. 



Genus ROTALIA. 



Test rotaliform, shell- wall very finely porous; exogenous deposit 

 either in the form of embossed septal lines or of granulation of the 

 sutures near the umbilicus. Aperture a neatly arched slit, nearly 

 median. 



ROTALIA BECCARII Linnaeus. 

 (Plate 75, fig. 2.) 



Double-convex, with convexity greatest on the inferior face; margin 

 rounded and slightly lobulated ; segments numerous, arranged in about 

 four convolutions, only the last visible on the under side; upper sur- 

 face smooth ; septa on inferior face more or less raised and granular, in 

 some cases double, with a deep fissure between the layers; umbilicus 

 sometimes excavated, sometimes filled with clear shell-substance; walls 

 thick and strong. Diameter, about 0.8 mm. (^ inch). 



Locality. Not recorded. 



ROTALIA ORBICULARIS d'Orbi^ny. 

 (Plate 75, fig. 5.) 



Superior face flat or slightly convex, inferior face moderately and 

 regularly convex; umbilicus scarcely if at all depressed; peripheral 

 margin rounded; walls finely porous; surface smooth, without orna- 

 mentation ; segments numerous, twelve or more in the final convolution ; 

 sutures conspicuous because of the thickening of the septal walls; 

 orifice regular. Diameter, about 0.8 mm. (- 3 -V inch). 



Locality. Coast of Oregon (station 3080), 93 fathoms. 



