DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 267 



loosely aggregated; color grayish white; cavity smooth, with or with- 

 out more or less numerous pits or depressions in the walls; no traces 

 of septa; no visible aperture. Average diameter, about 1.5 mm. (-Jg- 

 inch). 



Localities. North Atlantic, off Marthas Vineyard and Block Island 

 (stations 2584, 2586, 2221, 2234), 328 to 1,525 fathoms. 



CRITHIONINA PISUM, variety HISPIDA, new. 

 (Plate 6, fig. 2.) 



Iii form like C. pisum, but smaller; characterized by the bristly 

 appearance of the surface, caused by the projection of great numbers 

 of sponge spicules arranged for the most part nearly perpendicular to 

 the surface of the test. The very hispid tests have thinner walls than 

 those with fewer projecting spicules; texture of walls and shape of 

 cavity same as C. pi-sum. No visible aperture. 



Localities. Southeast of Georges Bank, Gulf of Mexico, and coast 

 of Oregon (stations 2570, 2571, 2379, 2394, 3080), 93 to 1,813 fathoms. 



Genus BATHYSIPHON. 



Test long, cylindrical, slightly tapering; in the form of a straight or 

 curved tube open at both ends. 



BATHYSIPHON RUFUM de Folin. 



(Plato 7.) 



Test long, very slender, tapering gradually, smooth and polished 

 externally, rather conspicuously constricted at very irregular intervals 

 along its whole length; color a rich reddish brown; walls of medium 

 thickness, composed of fine sand firmly and evenly cemented; cavity 

 corresponds to the external form, the constrictions being equally marked 

 within and without; apertures simple and terminal. Length, 3 to 

 9 mm. (J to i inch); diameter, 0.375 mm. (^ inch) or less. 



Localities. Gulf of Mexico and off the coast of Brazil (stations 

 2385, 27GO), 730 to 1,019 fathoms. 



Chambers nearly spherical; walls thin, composed of firmly cemented 

 sand grains or shells of foraminifera. 



Genus PSAMMOSPH^ERA. 



Test a single globular chamber without any general aperture, the 

 pseudopodia issuing from interstitial orifices. 



