. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. ANNELIDA. 171 Fig. 73.. De façon particulière au service de la respiration, sont tout simplement un genre de papilles ou stratifiés cutane productions- très peu ou pas du tout sous-divisé, attaché à l'extrémité ou à la base des pieds et distribués de façon quasi uniforme sur toute la longueur du corps, (Jig. 64, /",,/,./•) dans l'Eunice, et d'autres genres apparentés, leur position est la même, mais ils prennent la forme d'un long filament, meublé avec une série de prolongations de la même forme filiforme, dis

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. ANNELIDA. 171 Fig. 73.. especial manner subservient to respiration, are simply a kind of papillae or laminated cutane- ous productions very little or not at all sub- divided, attached either to the extremity or base of the feet and distributed in an almost uniform manner over the entire length of the body, (Jig. 64, /", , /, ./•) In the eunice, and other allied genera, their position is the same, but they assume the form of an elongated filament, furnished with a series of prolongations of a similar filiform shape, disposed like the teeth of a comb, and traversed longitudinally by a canal filled with red blood, (fig. 73, f.) In the amphinomian family, as in the former groups, these branchiae are placed on almost every segment of the body, so that these organs form along the whole extent of the back a double row; but here their struc- ture is more complicated, for the filaments are extremely subdivided, (fig. 63, /.) In the arenicolts, the form of the branchiae is almost the same as in the amphinomes, but they are limited in their position to the middle seg- ments of the body. In the genus terebella the branchiae are also highly ramified vascular appendages to the integument, but their num- ber is inconsiderable, and they are all inserted near the cephalic extremity of the back. In the serpulae, the membrane which forms a sort of thoracic disc near the cephalic ex- tremity of the body, ought to be regarded as an organ of respiration, and it is probable that the tentacles surrounding the mouth like a crown of plumes are subservient to the same function.* In the hirudinee respiration is in part effected by the external skin, but there exists in these annelida a series of small mem- branous sacs, which communicate externally each by a minute orifice situated on the ven- tral aspect of the body : these sacs derive from the numerous vessels which ramify upon their parietes a considerable quantity

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