330 ox THE MARIXE FAUXA OF ZAXZIBAR. [Feb. 16, 



EXPLANATION OP THE PLATES. 



Plate XX. 



Pig. 1. Muiiice afra{^. 2.89). Dorsal view of the anterior end of a medium-sized 

 Cliiialva specimen. X 3'5. 



2. Side view of the same, showing positiojis of the anterior feet and relations of 



pro- and peristomia. 



3. Outline of head and its appendages of a larger specimen showing the com- 



parativelj^ smaller size of these parts, to same scale. 



4. Lower jaw-plates of a j'oung specimen, which are transparent enou.gh to show 



the structure of the chitinous parts, the calcareous end-plates are well 

 developed. Cf. text-tig. 44, p. 293, which is from an older specimen. 



5. The bases of the tentacles and eyes, as seen when the anterior border of the 



peristomium is drawn back. e.=e5'e, (/r.=groove, !^.=tentacle. 



6. A large complete Maldivan specimen of IS. coccinea (p. 297), seen from the 



side to show proportions of body &c. X 2. 



7. Lower jaw-plates of a small Wasin specimen (p. 300), showing the character- 



istic structure of the end-plates. 



Plate XXI. 



Fig. 1. JSunice 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 yiew of (2) showing secretory pads formed by ventral cirri of the 



middle part of the body. All the above X 3. 



5. Setas and lips of seta-sac of the lOOtli foot. X 50. 



6. Setse in detail, a, acicular seta from hind body, the guard is broken away 



as in the majority of cases ; 5, knife-ended compound seta from the 20th 

 foot; e, hooked compound seta; d, two comb-setse. 



7. The jaw-apparatus of the youngest specimen. X 18. 



8. Set» of a young specimen. 



a and cl, two forms of acicular seta?, from the 35th and 20th foot respectivelj^ 

 h and c, compound setas. 

 e, an aciculum. 



9. ISunice 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 ]Dro- 

 stomium. 



11. Group of seta3 of the 50th foot in situ, showing the relative positions of the 



ditferent kinds. X 37. 



12. Isolated setfe : a, compound seta from 80th foot; c, compound, and b, comb- 



seta from the 20th. 



Plate XXIL 



Fig. 1. Eunice antennata (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 A'iew of the head, showing the grooved palps (Chuaka specimen, var. 



viridis). X 8. 



4. Lower or mandibular jaws, showing partly calcareous composition &c. 



5. An aciculum with biiid 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, anuulated anal cirri, &,c. X 10. 



8. JEimice siciliensis (p. 323). Compound seta?, showing the extreme shapes 



met with: «, 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 bodj% 



11. Setse of the same : — «, capillary; &, compound; c, comb; f?, acicular hook-seta, 



projecting from foot. 



