. The Devonian crinoids of the State of New York. Crinoidea, Fossil; Paleontology; Paleontology. 44 NEW YORK STATE MUSEUM are Carabocrinus, Hybocrinus and Stephanocrinus, Stephanocrinus has been at various times regarded as a cystid. blastoid or crinoid, and when it was unquestionably proven to be a crinoid its agreements with the cystids on the one hand and the blastoids on the other were recognized (Wachsmuth and Springer 1886, pp. 206-214). The mutual relationships, according to this view, of the different classes of echinoderms is shown in the following table taken from Bather (1900, p. 35
. The Devonian crinoids of the State of New York. Crinoidea, Fossil; Paleontology; Paleontology. 44 NEW YORK STATE MUSEUM are Carabocrinus, Hybocrinus and Stephanocrinus, Stephanocrinus has been at various times regarded as a cystid. blastoid or crinoid, and when it was unquestionably proven to be a crinoid its agreements with the cystids on the one hand and the blastoids on the other were recognized (Wachsmuth and Springer 1886, pp. 206-214). The mutual relationships, according to this view, of the different classes of echinoderms is shown in the following table taken from Bather (1900, p. 35): Cystidea Edrioasteroidea Pelmatozoa < Blastoidea !âHolothurioidea ' { Crinoidea -Echinoidea }â (Eleutherozoa) -Stelleroidea Parker and Haswell (1910, p. 437) derive the classes of echinoderms Holothuroidea Echinoidea Crinoidea. . Ophiuroidea idea1y Blastoidea Custoidea through a primitive cystid in the manner shown in figure 32. There is another view (ref. cit., p. 438) according to which the most primitive echinoderms are S y n a p t a and its allies (Holothuroidea a p o d a). The other holothurians are supposed to be derived from a S y n a p t a-like ancestor. The stalked classes were derived from the primitive stock of the holothurians; and the remain- der of the free classes were derived from the ancestral stalked echinoderm {see Bell, 1891, for a view along these lines). A very interesting view involving a holothurian-like ancestor is set Primitive Cusroid Dipleurula Figure 32 Diagram to illustrate one of the interpretations of the relationships of the classes of the Echinodermata. (After Parker and Haswell, 1910). 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 Goldring, Winifred, 1888-1971. Albany : University of the State of New York
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaleont, bookyear1923
