. The Canadian journal of industry, science and art. MINERALS AND GEOLOGY OF CANADA. 509. Fig. 73. 2. Stenopora fibrosa (= Chcetctes lycoperdon) Fig. 73. This form is made up of long fibrous or acicular tubes, with numerous transverse dia- phragms. These latter, however, to be properly seen, require the aid of a magnifying glass. The corallum is either globular, hemispherical, dendri- tic, or irregular. The dendritic forms often resemble sea-weeds, but, except in much weathered specimens, a magnify- ing glass will generally show their punctured surface (the openings of the cells), and their de
. The Canadian journal of industry, science and art. MINERALS AND GEOLOGY OF CANADA. 509. Fig. 73. 2. Stenopora fibrosa (= Chcetctes lycoperdon) Fig. 73. This form is made up of long fibrous or acicular tubes, with numerous transverse dia- phragms. These latter, however, to be properly seen, require the aid of a magnifying glass. The corallum is either globular, hemispherical, dendri- tic, or irregular. The dendritic forms often resemble sea-weeds, but, except in much weathered specimens, a magnify- ing glass will generally show their punctured surface (the openings of the cells), and their delicately fibrous structure. Very common throughout the Trenton Group, Utica Slate, and Hudson River Group of the Lower Silurian Series. Found also in the Upper Silurian rocks. 3. Favosifes Gothlandica ( = F. Niagarensis) Fig. 74.—The corallum in this species is properly hemispherical and sometimes of large size, but specimens are generally obtained in the form of irregular masses. These are made up of hexagonal or polygonal cell-tubes with numerous transverse diaphragms, and with pores in the cell walls. They are the " petrified honeycombs " of quarrymen, &c. Principally Upper Silurian ; but found occasion- in the Lower Silurian and frequently in the Devonian Scries. 4. Mickelinia convexa. Fig. 75.— The corallum in this species consists of large but shallow polygonal cells, with convex and in part vesicular diaphragms, and pores in cell walls. Devonian strata, Canada West. 5. Halysites catenulatus (= Catenipora ), fig. 76. this species, the well-known " chain coral," the oval cell-tubes are united in chain-like groups. There are numerous diaphragms, and some rudi- mentary radiating-laraellse. Chiefly character- istic of the Chnton and Niagara group (Upper Silurian), but found also of late years in the Lower Silurian Please note that these images are extracted from scanned page images that may have been digitally enhanced for read
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