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Show 330 ON THE MARINE FAUNA OF ZANZIBAR. [Feb. 16, EXPLANATION OF THE PLATES. PLATE XX. Fig. 1. Eunice afra (p. 289). Dorsal view of the anterior end of a medium-sized Chuaka specimen. X 3'5. 2. Side view of the same, showing positions of the anterior feet and relations of pro- and peristomia. 3. Outline of head and its appendages of a larger specimen showing the comparatively smaller size of these parts, to same scale. 4. Lower jaw-plates of a young specimen, which are transparent enough to show the structure of the chitinous parts, the calcareous end-plates are well developed. Cf text-fig. 44, p. 293, which is from a)) older specimen. 5. The hases of the tentacles and eyes, as see)) when the anterior horder of the peristomhvm is drawn back. e.=eye, gr.=groove, £.=tentacle. 6. A large complete Maldivan specimen of E. coccinea (p. 297), seen from the side to show proportions of body &c. X 2. 7. Lower jaw-plates of a small Wash) specimen (p. 300), showing the characteristic structure of the end-plates. PLATE XXI. Pig. 1. Eunice tubifex, adult (p. 303). Head and anterior part of body. 2. About segment 85, region of small gills. 3. Region of maximum development of gills. 4. Ventral view of (2) showing secretory pads formed by ventral cirri of the middle part of the body. All the above X 3. 5. Seta; and lips of seta-sac of the 100th foot. X 50. ii. Setffl in detail, a, acicular seta from hind body, the guard is broken away as in the majority of cases; b, knife-ended compound seta from the 20th foot; c, hooked compound seta; d, two comb-setae. 7. The jaw-apparatus of the youngest specimen. X 18. 8. Seta; of a young specimen. a and d, two forms of acicular seta5, from the 35th and 20th foot respectively. b and c, compound setae. e, an aciculum. 9. Eunice indica (p. 318). Head and anterior end of a full-grown specimen. X 4. 10. Ventral view of the head, showing grooves of the prostomium. Parts of the end-plates of the lower jaws project from behind the border of the prostomium. 11. Group of setae of the 50th foot in situ, showing the relative positions of the different kinds. X 37. 12. Isolated seta?: a, compound seta from 80th foot; c, compound, and b, comb-seta from the 20th. PLATE XXII. Pig. 1. Eunice antetitwta (p. 312). Anterior end of a large Zanzibar specimen which was less contracted than usual. X 3. 2. Head of another specimen in which the prostomium and peristomium differ in form from the above and the dorsal cirri are not moniliform. X 6. 3. Ventral view of the head, showing the grooved palps (Chuaka specimen, var. viridis). X 8. 4. Lower or mandibular jaws, showing partly calcareous composition &c. 5. A n aciculum with bifid distal end. X 280. 6. Compound seta from a posterior foot (the 80th), in which the end-piece has three hooks. X 280. 7. Posterior view of a Chuaka specimen (var. viridis), showing large posterior gills, annulated anal cirri, &c. X 10. 8. Eunice siciliensis (p. 323). Compound seta?, showing the extreme shapes met with: a, from an anterior (5th) foot; b, from a posterior foot. 9. A tentacle covered with papilla? distally. 10. Nicidion gracilis (p. 327). The anterior and part of the posterior division of the body. 11. Seta? of the same :-a, capillary; 6, compound; c, comb; d, acicular hook-seta, projecting from foot. |