Archive image from page 189 of Dawn of life being the. Dawn of life: being the history of the oldest known fossil remains, and their relation to geological time and to the development of the animal kingdom dawnoflifebeingh00daws Year: 1875 162 THE DAWN OF LIFE. system; and one of the most Eozoon-like I liave seen is a specimen of the undescribed species already men- tioned from the Guelph (Upper Silurian) limestone of Ontario, collected by Mr. Weston, and now in the Museum of the Geological Survey. I have attempted to represent its structures in fig. 44. In the rocks extending from the Lower
Archive image from page 189 of Dawn of life being the. Dawn of life: being the history of the oldest known fossil remains, and their relation to geological time and to the development of the animal kingdom dawnoflifebeingh00daws Year: 1875 162 THE DAWN OF LIFE. system; and one of the most Eozoon-like I liave seen is a specimen of the undescribed species already men- tioned from the Guelph (Upper Silurian) limestone of Ontario, collected by Mr. Weston, and now in the Museum of the Geological Survey. I have attempted to represent its structures in fig. 44. In the rocks extending from the Lower Silurian and perhaps fiom the Upper Cambrian to the Devonian inclusive, the type and function of Eozoon are con- tinued by the Stromatoporge, and in the earlier part of Fig. 46. Beceptaculites, restored. {After Billings.) (a.) Aperture, (b.) Inner wall, (c.) Outer wall, (n.) Nucleus, or primaiy chamber. (v.) Internal cavity. this time these are accompanied by the Archaeo- cyathids, and by another curious form, more nearly allied to the latter than to Eozoon, the Recepta- culites. These curious and beautiful fossils, which sometimes are a foot in diameter, consist, like Archseo- cyathus, of an outer and inner coat enclosing a cavity ; but these coats are composed of square plates with
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