. Bulletin - New York State Museum. Science. NIAGARA FALLS AND VICINITY 163 cia tubular, radiating on the upper surface from a depressed center; apertures oblique, imbricating, provided with a lunarium; mesopores short, irregular, decreasing in number from center to margin; large maculae or clusters of mesopores or of zooecia at regular intervals. Ceramopora imbricata Hall (Fig. 58) (1852. Pal. N. Y. 2:169, pi. 40E, fig. la-i) Distinguishing characters. Depressed hemispheric form, flattened or convex on the lower side; composed of cylindric or subcylindric tubes slightly diverging from the cen
. Bulletin - New York State Museum. Science. NIAGARA FALLS AND VICINITY 163 cia tubular, radiating on the upper surface from a depressed center; apertures oblique, imbricating, provided with a lunarium; mesopores short, irregular, decreasing in number from center to margin; large maculae or clusters of mesopores or of zooecia at regular intervals. Ceramopora imbricata Hall (Fig. 58) (1852. Pal. N. Y. 2:169, pi. 40E, fig. la-i) Distinguishing characters. Depressed hemispheric form, flattened or convex on the lower side; composed of cylindric or subcylindric tubes slightly diverging from the cen- ter, rectangular to plane of upper sur- face; arched or triangular aperture, opening on all sides toward the outer margin, arranged in alternating and imbricating series. Fig. 58 Ceramopora imbricata with en- Found in the Rochester shale at largement of surface Lockport (Hall) and probably also at Niagara. Ceramopora incrustans Flail (Fig. 59) (1852. Pal. N. Y. 2:i6g, pi. 40E, fig. 2a-d) Distinguishing characters. Incrusting ,„ ^ habit; cells increasing unequally from a center or point of growth, short, minute, * ' opening obliquely outward and arranged Fig. 59 ceramopora incrustans with ^^ quiuCUUX Ordcr. enlargement of surface -r^ ;i j 11 iX 1 h ound m the Rochester shale at Lock- port (Hall); may also occur at Niagara. Genus chilotrypa Ulrich [Ety.: xe't^o?, lip; rpoTta, perforation] (1884. Cin. soc. nat. hist. Jour. 7:49) Zoarium small, branching, with a narrow, irregularly contracting and expanding tube; zooecial tubes cylindric or somewhat com- pressed, thin walled, with or without diaphragms; walls minutely porous; apertures elliptic, oblique, the lower margin thickened and elevated; at irregular intervals maculae or monticules, composed of clusters of vesicles and of zooecia slightly larger than the average occur; interzooecial spaces occupied by vesicular tissue, which is commonly filled by a dense calcareous deposit near the Please note that the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
