. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Amphitrite alveolata. A. Dorsal surface, natural size. B. Part before a, b, magnified. C. A gill magnified. D. One still more magnified, to show the spiral ridges and cilia. appeared to be the same with that figured by Ellis (Corall. plate 36), and described by Cuvier as the Amphitrite a ruche, with which figure it agrees, except that it bears two rows of simple filaments on the back, which, for reasons that will appear, I was led to regard as gills. But if these are really gills, the animal must, it seems, be arranged w
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Amphitrite alveolata. A. Dorsal surface, natural size. B. Part before a, b, magnified. C. A gill magnified. D. One still more magnified, to show the spiral ridges and cilia. appeared to be the same with that figured by Ellis (Corall. plate 36), and described by Cuvier as the Amphitrite a ruche, with which figure it agrees, except that it bears two rows of simple filaments on the back, which, for reasons that will appear, I was led to regard as gills. But if these are really gills, the animal must, it seems, be arranged with the Dorsibranchiata, probably as a Sabella. The currents in this worm proceed forwards along the back, be- tween the rows of gills (as marked in Jig. B), and along the gills themselves (see C), whose points are directed forwards. The conical fila- ment of which each gill consists is marked on one side by ridges (see C, D), crossing it obliquely like segments of a spiral; and on these ridges as well as on the point of the gill the most conspicuous cilia are placed. The cilia are comparatively large and curved, their points being turned towards the summit of the gili, which figure they retain when their motion is stopped. The gills contain large * Edin. Med. and Sur. Jour. vol. xxxiv. bloodvessels, which when distended give them a bright red colour. The ciliary motion occurs also on what seem to be the branchiae of another tubicolar worm, the name of which is unknown to me; the organs in question are placed at the anterior extremity of the animal, concealed by a pro- fusion of long serpentine tentacula. Lastly, Mr. Cheek* observed the ciliary motion in the Sandworm (Arenicola piscato- rum). It was seen on the inner surface of the internal vesicles, which Sir Everard Home de- scribes as livers. Nothing similar exists on the tufts of filaments which form the 8. Mollusca.— The ciliary motion prevails very extensively in this division of the animal kingdom. It seems to
Size: 1094px × 2283px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
