Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 136 COMPARATIVE AX ATOMY. (Eunicidse, Fig. 56, A B), or are arborescent (Fig. 82, br) (e. g. in the Amphinomeas). As a dorsal cirrus is frequently present in ad- dition to these branchia?, they appear to be independent organs; Fig. 56. Diagrams of vertical sections of Annulata, showing the appendages. A Sec tiou of Eunice. B of Myrianida. p Nemopodium. p' Notopodium. br Branchia?. br1 Cirri. this is the more probable since they frequently are separated from the parapodia, and arise dire
Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 136 COMPARATIVE AX ATOMY. (Eunicidse, Fig. 56, A B), or are arborescent (Fig. 82, br) (e. g. in the Amphinomeas). As a dorsal cirrus is frequently present in ad- dition to these branchia?, they appear to be independent organs; Fig. 56. Diagrams of vertical sections of Annulata, showing the appendages. A Sec tiou of Eunice. B of Myrianida. p Nemopodium. p' Notopodium. br Branchia?. br1 Cirri. this is the more probable since they frequently are separated from the parapodia, and arise directly from the dorsal surface. They are distributed in varying number over the body. They are sometimes found on all the segments of it, but they are gene- rally less abundant at the tail (Eunice sanguinea, Amphinome). Sometimes they are limited to a number of segments and become gradually rudimentary (Arenicola, Hermella). In the tubicolous forms, the mode of life leads to the development of the anterior, and the disappearance of the posterior gills. On the three anterior segments of the Terebellida) there are branched branchial tufts (Fig. 70, br), in Pectinaria two comb-like branchia), and in Branchiosabella and Sabellides simple filiform appendages at the same point. In other divisions, also, of the Vermes the respiratory function is assigned to processes of the body. This is true of the tentacles of the Bryozoa. In the Gephyrea there are special developments as respiratory processes; in Sternaspis the hinder end of the body carries vascular appendages. Finally, even in the Hirudinea there are lamellar extensions of the integument arranged metamerically (Branchellion). Integument. 107. The integument of the Vermes, which is separated off from the ectoderm, is closely united to the muscular system, by which it is continued into the parenchyma of the body when a coolom is wanting'. This obtains in most of the Platyhchninths (Flat-worms) and Hiru- dinea. Where the coclom is pre
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