. The dawn of life [microform] : being the history of the oldest known fossil remains, and their relations to geological time, and to the development of the animal kingdom. Paleontology; Life; Paléontologie; Vie. WHAT IS EOZOON ? 77 1^ CD I / 1 i the laminae diverge from and approach each other, and fre- quently anastomose or are connected by transverse septa. " Under the microscope the resemblance to Stromatopora is seen to be in general form merely, and no trace appears of the radiating pillars characteristic of that genus. The lamince of serpentine and pyroxene present no organic struc
. The dawn of life [microform] : being the history of the oldest known fossil remains, and their relations to geological time, and to the development of the animal kingdom. Paleontology; Life; Paléontologie; Vie. WHAT IS EOZOON ? 77 1^ CD I / 1 i the laminae diverge from and approach each other, and fre- quently anastomose or are connected by transverse septa. " Under the microscope the resemblance to Stromatopora is seen to be in general form merely, and no trace appears of the radiating pillars characteristic of that genus. The lamince of serpentine and pyroxene present no organic structure, and the latter mineral is highly crystalline. The laminae of carbonate of lime, on the contrary, retain distinct traces of structures which cannot be of a crystalline or concretionary character. They constitute parallel or concentric partitions of variable thickness, enclosing flattened spaces or chambers, frequently crossed by transverse plates or septa, in some places so numerous as to give a vesicular appearance, in others oc- curring only at rare intervals. The laminae themselves are excavated on their sides into rounded pits, and are in some places traversed by canals, or contain secondary rounded cells, apparently isolated. In addition to these general appearances, the substance of the laminae, where most perfectly preserved, is seen to present a fine granular structure, and to be pene- trated by numerous minute tubuli, which are arranged in bundles of great beauty and complexity, diverging in sheaf- like forms, and in their finer exten' ? anastomosing so as to form a network (figs. 10 and 28). •. transverse sections, and under high powers, the tubuli are seen to be circular in outline, and sharply defined (fig. 29). In longitudinal sections, they sometimes present a beaded or jointed appear- ance. Even where the tubular structure is least perfectly preserved, traces of it can still be seen in most of the slices, though there are places in which the lamina are pe
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectpaleontology, bookyea
