. The Canadian naturalist and geologist. Natural history -- Periodicals. Fossils of the Hamilton Group, All. Fig. 15 Cystiphrjllum Americanum, (Edwards & Haime.) Fig. 15 Cystiphyllum Americanum. " Coral elongated, cylin- dro-turbinate, straio-ht or sli'^-btlv curved, covered by a thin epitheca, and presenting folds of growth more or less marked. When the epitheca is removed, the stride of very thin ribs may be observed. These are equal in size, and straight. The cup is cir- cular, margins thin, excavated ; septal rays distinct and prolonged to the centre under the form of fine striae
. The Canadian naturalist and geologist. Natural history -- Periodicals. Fossils of the Hamilton Group, All. Fig. 15 Cystiphrjllum Americanum, (Edwards & Haime.) Fig. 15 Cystiphyllum Americanum. " Coral elongated, cylin- dro-turbinate, straio-ht or sli'^-btlv curved, covered by a thin epitheca, and presenting folds of growth more or less marked. When the epitheca is removed, the stride of very thin ribs may be observed. These are equal in size, and straight. The cup is cir- cular, margins thin, excavated ; septal rays distinct and prolonged to the centre under the form of fine striae ; about one hundred may be counted. A verticle section shews a tissue entirely vesicular but which is very dense in the external parts of the fossil; the vesicles occupying the outside are in general small and oblique sloping inwards and downwards ; those in the centre are larger, a little unequal, and almost horizontal, broader than high, the largest are three millemetres (about one eighth of an inch) in length and 1 or 1^ millemetres in heighth ; the small ones are only about one millemetre in ; This species is the C. cylindrkum of the New ?ork reports. It occurs abundantly in the Hamilton Group in Western Canada. The star shaped mark near the centre of the figure is the base or root of a small encrinite which had attached itself to the specimeu figured by Prof. Hall after the death of the coral. The generic name'is derived from the Greek kicstis, a vesicle, or small cavity. Fossils of this genus when cut and polished, or when their internal arrangement is otherwise exposed, do not ex- hibit the reofularlv radiated structure of Streptelasma^ but consist altogether of vesicular structure. This species is usually four inches or less in lenoih and 1 or H in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble
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