2G6 REPORT OF NATIONAL MUSEUM, 1897. 



PELOSINA VARIABILIS Brady. 

 (Plate 4, fig. 1.) 



Specimens both cylindrical and flask-shaped, one of them consisting 

 of two quite irregular chambers; walls composed of mud with an 

 occasional adhering shell. Length, 3 to 6 mm. (J to J inch). Much 

 larger specimens are common. 



Locality. Gulf of Mexico (station 2395), 347 fathoms. 



Genus STORTHOSPH^ERA. 

 Test subglobular, very irregular externally; interior smooth. 



STORTHOSPH^ERA ALBIDA Schultze. 

 (Plate 4, fig. 2.) 



Subglobular or ovoid; surface roughened by prominent, rather thin 

 ridges and protuberances; wall of medium and variable thickness, 

 composed of very fine sand loosely cemented; cavity rounded, smooth; 

 no visible aperture; color very light gray. Diameter, about 1.5 mm. 

 (& inch). 



Locality. Gulf of Mexico (station 2385), 730 fathoms. 



Test monothalarnous ; walls thick, composed chiefly of felted sponge 

 spicules and fine sand, without calcareous or other ceinen t. 



Genus PILULINA. 

 Test nearly spherical; aperture a long and more or less curved slit. 



PILULINA JEFFREYSII Carpenter. 

 (Plate 5.) 



Test spherical, thin, fragile, composed of sponge spicules and line 

 sand; cavity undivided, smooth j aperture a narrow curved slit with 

 slightly protuberent lips. Section shows the large smooth cavity with 

 thin walls. Diameter varies from 1.25 to 3 mm. (^ to J inch). 



Locality. North Atlantic ; station not recorded. 



Genus CRITHIONINA. 



Labyrinthic or cavernous, or having a central undivided cavity with 

 subcavernous walls. 



CRITHIONINA PISUM Goes. 



(Plate 6, fig. 1.) 



Usually globular, sometimes elongated or compressed; surface regu- 

 lar; wall thick, soft, composed of fine sand and sponge spicules very 



