. On new species of fossil sponges from the Siluro-Cambrian at Little Metis on the lower St. Lawrence [microform]. Sponges, Fossil; Paleontology; Eponges fossiles; Paléontologie. 44 DAWSON AND HINDE bo a wide osculum above, and very numerous slender anchoring spicules below. There are also indications that, in mature specimens, the general form sometimes became cylin- drical or inverted conical, though specimens showing these forms are too imperfectly preserved to show the details of structure. In this species and P. ci/athiformis, the wall of the body seems to have been denser than in the oth
. On new species of fossil sponges from the Siluro-Cambrian at Little Metis on the lower St. Lawrence [microform]. Sponges, Fossil; Paleontology; Eponges fossiles; Paléontologie. 44 DAWSON AND HINDE bo a wide osculum above, and very numerous slender anchoring spicules below. There are also indications that, in mature specimens, the general form sometimes became cylin- drical or inverted conical, though specimens showing these forms are too imperfectly preserved to show the details of structure. In this species and P. ci/athiformis, the wall of the body seems to have been denser than in the other species and sometimes to have preserved its outward form, and this, with the multitude of minute spicules and the undeveloped condition of the spicular meshes of the skeleton, may possibly indie-te a generic differouce. On this species Dr. Hinde remarks :—" This sponge has a subcircular outline ; the central area is A'-acant and there is often a relati\ ely wide rim of a blurred mass of iron pyrites with an outer margin of fairly large cruciform spicules. The iron pyrites evi- dently represents a mass of spicules too small and too closely associated together to be separately distinguished in their replaced condition. The sponge is clearly hexactinellid and quite distinct from the others described ; Genus CYATIIOSPONG^IA {C/jathophi/cm), Walcott. 1.—CYATHOSrONOIA QUEBECKNSIS, (Figs. IG and lY. PI. Ill, fig. 1.). 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 the original Dawson, J. W. (John William), Sir, 1820-1899; Hinde, George Jennings, 1839-1918; Royal Society of Canada. [S. l. : s. n. ]
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