332 REPORT OF NATIONAL MUSEUM, 1897. 



ROTALIA SOLDANII d'Orbigny. 



(Plate 75, fig. 4.) 



Superior face flat and smooth ; inferior face highly convex; umbilicus 

 deeply excavated; peripheral margin thick and well rounded; walls 

 very finely perforated, surface smooth except the granular umbilicus; 

 face of the final segment broad and flat. Diameter, about 1 mm. 

 (t^5 inch). 



Localities. — A deep-water species, widely distributed. Specimens 

 from North Atlantic, Gulf of Mexico, and North Pacific (stations 2115, 

 2228, 2550, 25G8, 2570, 2385, 2394, 3080). 



ROTALIA SCHROETERIANA Parker and Jones. 



(Plate 76, fig. 1.) 



A large, strong, symmetrical shell, slightly convex on the upper face, 

 highly convex below; sutures broad and conspicuously marked on both 

 faces by numerous prominent beads of clear shell-substance; umbili- 

 cus filled with a dense irregular mass of shell. Section near the sujie- 

 rior face has opened all the chambers; cross section shows the umbili- 

 cal mass of shell- substance. Diameter, about 1.5 mm. {-^^ inch). 



Locality. — Not recorded. 



ROTALIA PAPILLOSA Brady. 

 (Plate 76, tig. 2.) 



Test lenticular, nearly equally convex on the two faces; segments 

 clearly defined on both faces by thick septa of transparent shell-sub- 

 stance more or less regularly penetrated by round aj^ertures sometimes 

 running into short fissures. Diameter, about 1 mm. {^^ inch). 



Locality. — Not recorded. 



ROTALIA PULCHELLA d'Orbigny. 

 (Plate 76, fig. 3.) 



Small, much compressed on both faces, composed of numerous some- 

 what inflated segments arranged in three or four convolutions, only 

 the last convolution visible on the underside; sutures raised in narrow, 

 sometimes interrupted ridges. Projecting radially from the margin are 

 three or four long slender spines, equaling or exceeding in length, when 

 unbroken, the greatest diameter of the test. Diameter, about 0.4 mm, 

 (eV inch). 



Locality. — Not recorded. 



Genus TRUNCATULINA. 



Test free or adherent, rotaliform, the inferior face generally more 

 convex than the superior; shell- wall coarsely porous ; aperture a curved 

 slit at or near the superior margin of the inner edge of the final seg- 

 ment, sometimes with a phialine neck and lip. 



