REPORT ON THE FORAMINIFERA. 
69 
Sub-family 3. Cassidulininse, — test consisting of a Textularia-like series 
of alternating segments, more or less coiled upon itself. 
Test biserial, folded on its long axis, and coiled more or 
less completely on itself ; rarely dimorphous, . Cassidulina, d’Orbigny. 
(Sub-genus, Orthoplecta, Brady.) 
Test biserial, broad, arched on the dorsal side ; general 
form that of an unfolded and uncoiled Cassidulina , Ehrenbergina , Reuss. 
Family VI. CHILOSTOMELLID^E. 
Test calcareous, finely perforate, polythalamous. Segments following each other from 
the same end of the long axis, or alternately at the two ends, or in cycles of three ; more 
or less embracing. Aperture a curved slit at the end or margin of the final segment. 
Test uniaxial, segments oval, each springing from the base 
of the previous one and entirely enveloping it ; 
aperture terminal, ..... Ellipsoidina , Seguenza. 
Segments oval, put on alternately at either end of the test, Chilostomella, Reuss. 
Segments alternating at three sides so as to leave portions 
of two, in addition to the final one, exposed, . Allomorphina, Reuss. 
Family VII. LAGENIDJE. 
Test calcareous, very finely perforated ; either monothalamous, or consisting of a 
number of chambers joined in a straight, curved, spiral, alternating or (rarely) branching, 
series. Aperture simple or radiate, terminal. No interseptal skeleton nor canal system. 
Sub-family 1. Lageninse, — test monothalamous. 
Test monothalamous, ecto- or ento-solenian, . . Lagena, Walker and Boys. 
Sub-family 2. Nodosarinse, — test polythalamous ; straight, arcuate, or planospiral. 
Test straight or curved, circular in transverse section ; 
aperture typically central, .... Nodosaria, Lamarck. 
Test straight, compressed ; aperture typically a narrow 
fissure, ...... Lingulina, d’Orbigny. 
Test compressed or complanate, segments Y-shaped, 
equitant ; primordial chamber distinct . . Frondicularia, Defrance. 
(zoon CHALL. EXP.— PART XXII. — 1884.) ' Y 10 
