A treatise on zoology . ^^brachia also forms a clear distinction betweand Blastoidea. A further difficulty in tracCrinoidea is furnished by the occurrence o. Fig. I. Analysis of the cup and brachial elements of Hybocystis problfood-grooves (vg) are dotted. species in the Lower Cambrian, while represeorders are plentiful in Ordovician rocks. Fever, may throw back the origins of other Eany case, negative evidence when Cambriancounts for little. Certain features in some of the older Crilight on their ancestry. Such are the precomparable to those of Codaster, in CaratHijhocrinus (p. 145); the pres
A treatise on zoology . ^^brachia also forms a clear distinction betweand Blastoidea. A further difficulty in tracCrinoidea is furnished by the occurrence o. Fig. I. Analysis of the cup and brachial elements of Hybocystis problfood-grooves (vg) are dotted. species in the Lower Cambrian, while represeorders are plentiful in Ordovician rocks. Fever, may throw back the origins of other Eany case, negative evidence when Cambriancounts for little. Certain features in some of the older Crilight on their ancestry. Such are the precomparable to those of Codaster, in CaratHijhocrinus (p. 145); the presence in thesewell-developed deltoids (A), over the edges ollacra, while the posterior A frequently show(Fig. XXXVI.); the absence of a brachiumBaerocrinus (Fig. LVII. 4); the greater devehin many Inadunata Monocyclica (see p. 144a form not unlike that which is actually pWetherby (1880), from the Ordovician oThis has 5 large subequal basals, 5 radials THE CRINOIDEA ween the posterior A and the radial circlet, being the latter by a special anal plate {x). The right ^ is transversely bisected; its upper smaller portion hed a little to the right by x. The
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
