REPORT ON THE FORAMENTEERA. 
221 
character is always apparent. Shells belonging to the “ laciniate ” group are readily 
distinguished from the class of specimens already referred to, in which the anomalous 
features depend on mere irregularity of growth or on actual additions to the test (PI. 
XVII. figs. 1-5), and which for the most part partake more of the nature of monstrosities 
than of definable varieties. 
The occurrence of Orbitolites complcmata, var. Iciciniata, is limited to a few localities. 
It was obtained in great abundance in shallow water on the coral-reefs of Tongatabu, 
Friendly Islands, and of the neighbouring Fiji group, but was not collected elsewhere 
during the Challenger voyage. 
Sub-family 5. Alveolininse. 
Alveolina, d’Orbigny. 
Diseolithus , pars, Fortis [1801]. 
Nautilus, pars, Fichtel and Moll [1803]. 
Borelis, Montfort [1808], Bronn, Ekrenberg. 
Miliolites, Clausulus, Montfort [1808]. 
Fasciolites, Parkinson [1811], Sowerby. 
Melonites, Lamarck [1812], 
Alveolites, Defrance 1 [1816], Brongniart. 
fflryzaria, Defrance [1820]. 
Melonia, Defrance [1824], Blainville, Deskayes, Eickwald, Reuss. 
Alveolina, d’Orbigny [1826], Deskayes, Renss, Leymerie, Czjzek, Riitimeyer, Carter, Arckiac and 
Haime, Carpenter, Gemmellaro, Parker and Jones, Ivarrer, Giimbel, Brady, Moebius, &c. 
Orbiculina, pars, d’Orbigny [1846], 
The generic term Alveolina is employed for a group of recent and fossil porcellanous 
Foraminifera, the most familiar examples of which are the long fusiform shells conspicuous 
amongst the microzoa of coral-sands. These represent one extreme of a somewhat 
extensive morphological series — that in which the axis of growth is longest as compared 
with the breadth of the test. The other forms are relatively shorter and broader, and 
take successively elliptical, prolate, spherical, oblate, and discoidal shapes, according to 
the degree in which the length of the axis is diminished. The minute structure of the 
shell of the various modifications of the genus has been so fully described and illus- 
trated by Dr. Carpenter (Introd. Foram., p. 99 et seq.) that anything further than a 
brief account of its more interesting general features would be superfluous. 
The shell is spiral, and consists of a number of arched segments wound around a more 
or less elongated axis, each chamber being divided into a number of smaller spaces or 
chamberlets. The outline of the segments is marked externally by depressed lines, nearly 
equidistant and extending from pole to pole ; and slighter furrows, at right angles to the 
principal sutures, indicate the position of the secondary septa which subdivide the chambers 
(ZOOL. CHALL. EXP. PART XXII. 1883.) Y 29 
