. Ein text-Buch von Wirbellosen Morphologie. Wirbellose Tiere. 198 wirbellose Morphologie. Werden als Vertreter der überlieferten Form, von dem sowohl Sie als auch die Rotifera abstammen haben mehr Fast als die letztere Gruppe, oder ob Sie modiflcations des Eotifer Art von Struktur und haben für ihre Vorfahren waren Kotifer Formen, die - wie in der Struktur hatte, es ist schwer zu sagen, in Betracht gezogen werden; obwohl der Saldo der Beweis scheint zu Gunsten des ehemaligen zur Spitze. Aufmerksamkeit sollte genannt werden, jedoch zu einem möglichen Zugehörigkeit der Qas-trotridha mit der Echinodera. Wenn, wie bereits vorschlagen

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. A text-book of invertebrate morphology. Invertebrates. 198 INVERTEBRATE MORPHOLOGY. are to be considered as representing the ancestral form from which both they and the Rotifera have descended more nearly than the latter group, or whether they are modiflcations of the Eotifer type of structure and have had for their ancestors forms which were Kotifer-like in structure, it is difficult to say; though the balance of evidence seems to tip in favor of the former view. Attention should be called, however, to a possible affiliation of the Qas- trotridha with the Echinodera. If, as has been suggested (p. 186), the seg- mentation of the latter has no phylogenetic significance, it is not difficult to trace similarities of structure in the two groups, the principal differ- ences being connected with external parts. It is by no means improbable that the Gastrotricha, Rotifera, and Echinodera form a series, each of the groups being of equivalent rank, and related to each other somewhat as are the Turbellaria, Trematoda, and Oestoda. Genus Dinophilus. The genus Dinophilus includes some small marine organ- isms all of which are referable to a small number of species. The body (Fig. 96) is cylindrical and consists of a head segment followed by from 5-7 trunk segments (the number varying according to the species), each of which bears a ring of cilia, inter- rupted ventrally by a uniform ciliation which covers the entire ventral surface. The head is likewise provided with a ring of cilia which is usually double, one of the constituent bands passing in front of the mouth and the other behind it, the area in- tervening between these two bands being, in one species at least, occupied by smaller cilia. The musculature of the body-wall is but weakly developed, though both an external layer of circular fibres and an in- ternal one of longitudinal fibres may be found, both layers being absent in one species in the dorsal region. The coelom is traversed by a network of branching cells the

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• bookcentury1800
• bookdecade1890
• bookpublishernewyo
• bookyear1894