266 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. (i to ^ 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, iig. 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. 

 (ijr in ch). 



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



Subfamily PILTTLI^KmSTJE:. 



Test monothalamous; walls thick, composed chiefly of felted sponge 

 spicules and fine sand, without calcareous or other cement. 



Genus PILULINA. 

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



PILULINA JEFFREYS1I Carpenter. 

 (Plate 5.) 



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

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

 slightly protuberent lips. Section shows the large smooth cavity with 

 thin walls. Diameter varies from l.'2r} to 3 mm. (J V) to £ inch). 



Locality. — j^orth 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 



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