DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 265 



Subfamily 



Walls thick, composed of loose sand or mud, very slightly cemented. 



Genus ASTRORHIZA. 



Test fusiform or depressed. Depressed forms either sublenticular 

 with angular or irregularly radiate margin, or in branching masses. 

 Apertures at the end of each ray or branch. 



ASTRORHIZA GRANULOSA Brady. 



(Plate 1.) 



Test fusiform, composed of fine gray sand rather loosely cemented; 

 cavity a tube of nearly uniform diameter, open at both ends; extremities 

 of the test often tinged brown. Section shows thickness of shell and 

 dimensions of cavity. Length, 4.5 mm. (-fc inch), more or less. 



Locality. North Atlantic (stations 2568, 2570, 2723), 1,685 to 1,781 

 fathoms. 



ASTRORHIZA CRASSATINA Brady. 



(Plate 2.) 



Test elongate, irregularly cylindrical. Differs from A. granulosa in 

 that the cavity is more or less constricted at uncertain intervals. 

 Length, 6 mm. (J inch) or more. 



Localities. North Atlantic off Georges Bank, off Long Island, and 

 off Chesapeake Bay (stations 2570, 2586, 2723), 328 to 1,813 fathoms. 



ASTRORHIZA ANGULOSA Brady. 

 (PlateS, fig. 1.) 



Test irregularly triangular, depressed, thick, fragile, composed of fine 

 gray sand loosely coherent; cavity a central globular chamber with 

 tubes radiating to the angles and terminating in simple apertures. 

 Section to show the cavity. 



Locality. Marthas Vineyard (station 2569), 1,782 fathoms. 



ASTRORHIZA ARENARIA Norman. 

 (Plate 3, fig. 2.) 



Test compressed, radiate or branched, composed of fine gray sand 

 loosely cemented; very fragile; cavity corresponds with the form of 

 the test; aperture at the end of each ray or branch. 



Localities. Off Marthas Vineyard and Georges Bank (stations 2547, 

 2570, 2586), 328 to 1,813 fathoms. 



Genus PELOSINA. 



Test free, typically monothalamous; rounded, cylindrical, tapering 

 or irregularly fusiform ; walls composed of mud with a chitinous lining; 

 aperture single, terminal. 



