330 REPORT OF NATIONAL MUSEUM, 1897. 



forated; exteriorly rough; aperture a long fissure with a raised lip at 

 the inner margin of the final segment. Section shows chambers of the 

 final convolution. Diameter, about 0.0 mm. (/^ inch). 

 Locality. — Not recorded. 



PULVINULINA MICHELIANA d'Orbigny. 

 (Plate 74, fig. 2.) 



Subconical, the superior face forming the base of the cone, being flat 

 with an angular margin; the inferior face being conical, deeply exca- 

 vated at the top; segments, about ten, elongated, i)rojecting in a ridge 

 around the umbilicus; sutures not depressed ; aperture a long narrow 

 slit at the inner margin of the last segment. Transverse section close 

 to the superior surface has opened all but one of the ten chambers. 

 Diameter, about 0.8 mm. (^^ inch). 



Localities. — Species widely distributed geographically. Specimens 

 from the Gulf of Mexico (station 2377), 210 fathoms. 



PULVINULINA UMBONATA Reuss. 

 (Plate 74, fig. 4.) 



Small, biconvex, with the greatest convexity on the lower face; 

 umbilici not depressed; margin rounded; segments rather numerous, 

 in about three narrow convolutions; sutures straight, radial, smooth. 

 Diameter, about 0.75 mm. (3-0 inch). 



Locality. — Off coast of Oregon (station 3080). 



PULVINULINA PAUPERATA Parker and Jones. 

 (Plate 74, fig. 3.) 



Thin, flat, and transparent, composed of fifteen to twenty or more 

 slightly inflated segments, arranged in about two planospiral convolu- 

 tions, all the segments being visible on both sides; margin extended 

 into a broad, thin wing of clear shell- substance entirely surrounding the 

 final convolution. Diameter, about 1.5 mm. (j-g inch), often much 

 greater. 



Locality. — Specimens from the Gulf of Mexico (stations 2385, 2395), 

 730 and 317 fathoms. 



PULVINULINA KARSTENI Reuss. 



(Plate 74, fig. 5.) 



Lenticular, about equally convex on both faces, smooth and regular, 

 with a blunt angular peripheral margin, composed of about three con- 

 volutions, the last having five or six segments; sutures often indis- 

 tinctly marked superiorly, well-defined, and a little depressed on the 

 inferior face; aperture as usual, a narrow slit on the inner margin of 

 the final segment. Diameter, about 0.6 mm. (/o inch). 



Locality. — Forth Atlantic (station 2212), 428 fathoms. 



