DESCRIPTIVE CATALOGUE OF RECENT FORAMINIFERA. 293 



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

 fathoms. 



CASSIDULINA SUBGLOBOSA Brady. 

 (Plate 38, tig. 4.) 



Sub globular, the final segment sliglitl}- protruding, inequilateral, the 

 segments being irregularly arranged ; surface smooth ; walls calcareous, 

 imperfectly transparent, finely i)erforated; aperture an oval slit at the 

 end of the last segment. Diameter, 0.8 mm. (y^j inch). 



Localities. — Gulf of Mexico, oft" Windward Islands, and Trinidad 

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



Family V. MILIOLID^. 



Test imperforate; normally calcareous and porcellanous, sometimes 

 incrusted with sand. 



s;Tibiainiiy M:iriiOLiisriisr.<gE. 



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

 eitber symmetrically in a single plane or inequilaterally. Ai)erture 

 alternately at either end of the shell. 



Genus BILOCULINA. 

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



BILOCULINA BULLOIDES d'Orbigny. 

 (Plati^ 38, fig. .o.) 



Oval, inflated, composed of a series of embracing segments api^lied 

 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. — Oft' Havana, Cuba (station 2335), 204 fathoms. 



BILOCULINA TUBULOSA Costa. 



(Plate 39, fig. 1.) 



In general characters like />'. hidloides, except that the last two seg- 

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

 be so deej) 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 Miliolina trigonula. Length, 0.75 to 1.5 mm. 

 (sVto i-inch). 



Locality. — Specimens collected oft' the coast of Oregon (station ."iOSO), 

 93 fathoms. 



