180 
THE VOYAGE OF H.M.S. CHALLENGER. 
Miliolina agglutinans, d’Orbigny. sp. (PI. VIII. figs. 6, 7). 
Quinqueloculina agglutinans, d’Orbigny, 1839, Foram. Cuba, p. 168, pi. xii. figs. 11-13. 
Miliola (Quinqueloculina) agglutinans, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 410, 
pi. xv. fig. 37, a.l). 
Miliolina agglutinans, Siddall, 1879, Catal. Brit. Rec. Foram., p. 4. 
„ „ Terrigi, 1880, Atti dell’ Accad. Pontif., Ann. xxxiii. p. 172, pi. i. fig. 1. 
The structure of the test of the sandy Miliolce differs in one important particular 
from that of the strictly arenaceous groups of Foraminifera. In the Astro rliizidm and 
Lituolidce the investment is composed of sand and cement in variable proportions, and 
when the calcareous or other cement is in considerable excess the test is usually 
imperforate ; when, on the other hand, the sand is coarse and the cement scanty, it 
becomes in a certain sense perforate, inasmuch as interstitial openings are left at various 
points of the surface. In the Miliolidce, whether smooth or rough externally, the shell 
is always imperforate. The sandy coat, however thick it may be, is only an incrustation, 
and has a calcareous shelly lining. This inner shell is often exceedingly thin, but it 
appears to be invariably present ; it is porcellanous in texture, and in sections 
presents a uniform brownish tint by transmitted light. 
The arenaceous section of the Miliolce includes a considerable number of specific or 
varietal forms, and the term Miliolina agglutinans is reserved for the particular group 
which is characterised by having the chambers arranged in the normal Triloculine or 
Quinqueloculine manner, and by possessing a large conspicuous aperture. These two 
features are sufficient to distinguish it from Planispirina celata and Miliolina crassatina, 
the only species with which it is likely to be confounded. 
Miliolina agglutinans is a very widely diffused Foraminifer. Its area of distribution 
extends to all the great oceans except the South Atlantic, and includes the Mediterranean 
and the Red Sea. As a rule it inhabits shallow water, and is most abundant amongst 
the coral -sands of the tropics ; but it is occasionally found at greater depths, and in one 
instance specimens have been obtained from the North Atlantic at 440 fathoms. 
It was obtained by Crosskey and Robertson from the Post-tertiarv clays of Norway, 
and by Robertson in those of the west of Scotland, but there appears no other 
satisfactory record of the occurrence of the species in the fossil condition. 
Miliolina crassatina, n. sp. (PI. VIII. fig. 5, a. b.). 
Miliolina incrassata, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi., N. S., p. 46. 
Test broadly elliptical or subglobular, somewhat compressed ; segments few, embracing; 
septation obscure. Aperture crescentic, situate in a short delicate neck rising from the 
superior extremity of the final segment. Texture coarsely arenaceous. Length, ^rd inch 
(075 min.). 
