286 REPORT OF NATIONAL MUSEUM, 1897. 



Localities. Specimens from four stations in the North Atlantic, one 

 in South Atlantic, and two in the Gulf of Mexico (stations 2040, 2228, 

 2383, 2385, 2570, 2679, 2760), 730 to 2,226 fathoms. 



Genus VALVULINA. 



Test spiral, typically triserial, with three segments or rarely more 

 in each convolution ; free or adherent; aperture partially covered by 

 a valvular lip. 



VALVULINA CONICA Parker and Jones. 

 (Plate 31, fig. 3.) 



Free or attached, short, conical; base broad and excavated; color 

 brown, generally darker toward the apex ; texture arenaceous ; surface 

 smooth; aperture at the inner margin of the terminal segment. One 

 specimen shown is parasitic upon a fragment of RhaMammina; the 

 base of the attached Valvulina is surrounded by a border of fine white 

 sand. 



Localities. Off Cape Hattefas, and south of Block Island (stations 

 2115, 2584), 843 and 541 fathoms. 



Genus BIGENERINA. 

 Early chambers Textularian, later chambers uniserial and rectilinear. 



BIGENERINA NODOSARIA d'Orbigny. 

 (Plate 31, fig. 4.) 



The earlier segments, increasing rapidly in size, are arranged in two 

 alternating series, forming the triangular flattened portion of the test, 

 the remainder of the test is composed of three or four segments in a 

 single straight series; aperture at the end of the final segment; tex- 

 ture coarsely arenaceous ; surface rough. Length, about 1 mm. (^ inch). 



Locality. Off Carysfort Light, Florida (station 2641), 60 fathoms. 



BIGENERINA ROBUSTA Brady. 

 (Plate 32, fig. 1.) 



Test large, coarse, elongate, cylindrical, tapering slightly toward the 

 initial end; textularian segments numerous, forming the greater part of 

 the test ; nodosarian segments few, sometimes irregular ; aperture cen 

 tral in the final segment. Diameter, 2.5 mm. (-fa inch) or more. 



Locality. Old Providence Island (station 2150), 382 fathoms. 



BIGENERINA CAPREOLUS d'Orbigny. 

 (Plate 32, fig. 3.) 



A rather stout, coarse shell, the earlier portion resembling Texhilana 

 carinata, upon which rests two or three broad compressed segments in 

 single series. Length, 1.5 mm. (-fa inch). 



Locality. Off coast of Georgia (station 2416), 276 fathoms. 



