REPOET ON THE EORAMINIFERA. 
61 
B. With a mouth at each end of the test. 
Test hyaline, elongate, tubular, cylindrical or flattened ; 
ends slightly tapering towards the apertures. Nu- 
cleus large and complex, .... Shephear della, Siddall. 
Family II. MILIOLID-^E. 
Test imperforate ; normally calcareous and porcellanous, sometimes encrusted with 
sand; under starved conditions ( e.g ., in brackish water), becoming chitinous or chitino- 
arenaceous ; at abyssal depths occasionally consisting of a thin, homogeneous, imperfo- 
rate, siliceous film. 
Sub-family 1 . Nubecularinso, — test free, or more usually adherent, taking various 
irregular asymmetrical forms, and with variable aperture or apertures. 
Test a single inflated adherent chamber, with aperture on 
the convex surface, .... Squamulina, Schultze. 
Typically more or less spiral, and adherent ; but, whether 
adherent or free, assuming very irregular and 
anomalous contours. Test often encrusted with 
sand, ...... Nubecularia, Defrance. 
Sub-family 2. Miliolinin 06 ,— chambers two in each convolution, coiled on an 
elongated axis, either symmetrically in a single plane, or inequilaterally. Aperture 
alternately at either end of the shell. 
Chambers in a single plane, embracing ; the last two only 
visible, ...... 
Chambers Biloculine in arrangement, but subdivided in 
the interior. Aperture porous, 
Chambers arranged in a single plane, the whole of them 
visible on both sides of the shell, 
Chambers inecpiilateral, coiled round the long axis of the 
shell, in such a way that more than two (usually 
three or five) are visible externally, . 
(ZOOL. CUALL. EXP. PART XXII. 1884.) 
Biloculina, d’Orbigny. 
Fabularia, Defrance. 
Spiroloculina, d’Orbigny. 
Miliolina, Williamson. 
Y 9 
