. Fossil sponges and other organic remains from the Quebec Group at Little Metis [microform]. Sponges; Paleontology; Eponges; Paléontologie. I [DAWSON] FOSSIL SPONGES AND OTHER ORGANIC REMAINS 103 This is one of the most abuiKhint species at Little Metis. Thore can he no hesitation in phicing it in the i^enus Protospomjia, since tlie same avvangenient of the spicular mesh-work is present in it as in the type of this ifenus. In the earlier examples of the i^eiius, however, the presence of anchoriniii-spicules was not recognized, owing, no doubt, to their imper- fect state of preservation, and t
. Fossil sponges and other organic remains from the Quebec Group at Little Metis [microform]. Sponges; Paleontology; Eponges; Paléontologie. I [DAWSON] FOSSIL SPONGES AND OTHER ORGANIC REMAINS 103 This is one of the most abuiKhint species at Little Metis. Thore can he no hesitation in phicing it in the i^enus Protospomjia, since tlie same avvangenient of the spicular mesh-work is present in it as in the type of this ifenus. In the earlier examples of the i^eiius, however, the presence of anchoriniii-spicules was not recognized, owing, no doubt, to their imper- fect state of preservation, and this feature nniy now he i-eckonetl as one of the generic characters. In the present species, however, these anclior- ingspicules were very peculiar, and seem to l)e rays of a cruciform spicule, which were bent upward and lengthened, forming a stalk for the sponge. This would give a firm attachment, and adapt itself to the gradual risi' of the bottom to which the sponge was attached. The mechanical pi'ojtertics of such an arrangement of spicula are obviously well suited to ett'ect their purpose. Some further remarks on the /yssakiiw character of Frotospomjia will he found in the paper of 1889, and the moi'e recent collections also show that the skeleton spicules, at fii-st small in the young specimens, grew in length, by additions to the ends of the rays as the body increased in size. 2,—Protospongia mononema, Dawson. (Figs. 6, 7 and 8. PI. Figs. 2 and 3.). 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. Montreal : [s. n. ]
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Keywords: ., bookcentury1800, bookdecade1890, booksub, booksubjectpaleontology
