DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 293 



Locality. Off head of Akutan Island, Alaska (station 2842), 72 

 fathoms. 



CASSIDULINA SUBGLOBOSA Brady. 



(Plate 38, tig. 4.) 



Subglobular, tfoe final segment slightly protruding, inequilateral, the 

 segments being irregularly arranged; surface smooth; walls calcareous, 

 imperfectly transparent, finely perforated; aperture an oval slit at the 

 end of the last segment. Diameter, 0.8 mm. (- - inch). 



Localities. Gulf of Mexico, off Windward Islands, and Trinidad 

 (stations 2383, 2751, 2754), 880 to 1,181 fathoms. 



Family Y. MILIOLID^E. 



Test imperforate; normally calcareous and porcellanous, sometimes 

 incrusted with sand. 



Subfamily MILIOLI^rN^H;. 



Chambers two in each convolution, coiled on an elongated axis, 

 either symmetrically in a single plane or inequilateral! y. Aperture 

 alternately at either end of the shell. 



Genus BILOCULINA. 

 Chambers in a single plane, embracing; the last two only visible. 



BILOCULINA BULLOIDES d'Orbigny. 



(Plate 38, fig. 5.) 



Oval, inflated, composed of a series of embracing segments applied 

 alternately above and below the globular primordial chamber; walls 

 thick, calcareous, soft; surface often incrusted with a thin layer of fine 

 sand; aperture small, circular, on the more or less produced or tubular 

 end of the last segment, usually bearing a small T-shaped valvular 

 tooth. Length, about 1.25 mm. ($ inch). Transverse section shows 

 the arrangement of the chambers. 



Locality.-^Off Havana, Cuba (station 2335), 204 fathoms. 



BILOCULINA TUBULOSA Costa. 



(Plate 39, fig. 1.) 



In general characters like />. bulloides, except "that the last two seg- 

 ments are separated by a deep groove on both sides. This groove may 

 be so deep as to show the edge of the antepenultimate segment, and is 

 often wider on one side than the other, so that the species passes by 

 regular gradation into MiUolina trigonula. Length, 0.75 to 1.5 mm. 

 (Ar to -iV inch). 



Locality. Specimens collected off the coast of Oregon (station 3080), 

 93 fathoms. 



