CONTEMPORARIES AND SUCCESSORS OF EOZOON. 139 



sometimes in a linear manner^ sometimes spirally, like 



those Globigerin89 which constitute the mass of modern 



leep-sea dredgings and also of the chalk. These 



)dies occur dispersed in the limestone, arranged in 



lin layers parallel to the bedding or sometimes in the 



fcrge chamber-cavities of Eozoon. They are so varia- 



)le in size and form that it is not unlikely they may 



)e of different origins. The most probable of these 



lay be thus stated. First, they may in some cases 



>e the looser superficial parts of the surface of Eozoon 



)roken up into little groups of cells. Secondly, they 



lay be few-celled germs or buds given off from 



iozoon. Thirdly, they may be smaller Foraminifera, 



Itructurally allied to Eozoon, but in habit of growth 



jsembling those little globe-shaped forms which, as 



ilready stated, abound in chalk and in the modern 



)cean. The latter view I should regard as highly 



)robable in the case of many of them ; and I have 



)roposed for them, in consequence, and as a convenient 



lame, Archceosjpherincej or ancient spherical animals. 



Carbonaceous matter is rare in the true Eozoon 



lestones, and, as already stated, I would refer the 



iaurentian graphite or plumbago mainly to plants. 



'ith regard to the worm-burrows referred to in 1 865, 



lere can be no doubt of their nature, but there is 



)me doubt as to whether the beds that contain them 



'e really Jjower Laurentian. They may be Upper 



jaurentian or Huronian. I give here figures of these 



furrows as published in 1866* (fig. 35). The rocks 



* Journal of Geological Society. 



