250 DR. BAIIIU ON TWO NOMDESCRIPT LARVAL ANNULOSA. 



Fig. 7 d. Ventral seta of ditto, of Chloeia tiimida. X 50 diam. 

 Fig. 8 a. Dorsal seta of Chloeia parva. x ditto. 

 Fig. 8 b. Ventral seta of ditto. X ditto. 



Plate V. Thetisellafiava. 

 Fig. 1. Dorsal aspect. Animal enlarged two-thirds. 

 Fig. 2. Ventral aspect. Ditto. 

 Fig. 2 a. Natural size. 

 Fig. 3. Lateral aspect. X two-tliirds. 

 Fig. 4. Tuft of (?) branchial setae along with a portion of the skin on which they 



are seated, x 25 diam. 

 Fig. 5. A single (?) branchial seta. X 50 diam. 

 Fig. 6. One of the setse of the feet. X ditto. 

 Fig. 7. One of the booklets on under thoracic surface. X ditto. 

 Fig. 8. One of the setse which are found interspersed amongst the ordinai*y 



seta; of the feet. X ditto. 

 Fig. 9. Portion of the dermal surface of dorsal portion of the body, showing 



the granular structui-e of the skin, with small round masses and minute 



calcareous spicula in the intermediate portion. X 100 diam. 

 Fig. 10. Portion of the lateral surface of body, X two-thirds, and one of the 



little knobs on its sm'face. X 25 diam. 

 Fig. 11. Tlie calcareous spicula interspersed among the dermal scales shown 



in fig. 9. X 400 diam. 



PiiATE VI. Thetisella olivacea and Hippono'c Cranchii. 



Fig. 1 , Thetisella olivacea, dorsal view. X two-thu'ds. 



Fig. 2. Thetisella olivacea, ventral view, x ditto. 



Fig. 2 a. Thetisella olivacea. Natural size. 



Fig. 3. Thetisella olivacea, lateral view. X two-thirds. Similar knobs are 

 present in this species as in the last (Plate V. fig. 10), but they were 

 too much covered with the bundles of setie to be shown in the figure. 



Fig. 4. Head and organs of the mouth, showing the close correspondence of 

 these organs in this animal with those of several larvae of insects. 

 Supposing these animals to be larvae, a, a, are the antenna; ; 7nx, ma:, 

 are the maxillae, with a large inwardly projecting lobe on each, 

 arising from the antebasal point ; this lobe has foiu' tactile appen- 

 dages exactly like a similar process in the larva of the Clothes Moth, 

 and two short seta; : I b r, is the labrum ; I b, the labium ; If, It, la- 

 bial tentacles, composed of a basal joint and two seta;. 



Fig. 5. One of the setaa of feet. X 50 diam. 



Fig. 6. One of the setiB interspersed among the others. X ditto. 



Fig. 7. Hipponoe Cranchii, dorsal aspect. X 3 diam. 



Fig. 8. Hipponoe Cranchii, ventral aspect. X ditto. 



Fig. 8 a. Hipponoe Cranchii. Natural size. 



Fig. 9. Head, as seen from beneath. X 25 diam. 



Fig. 10. Head, as seen from above, x ditto. 



a, antennae ; p, palpi ; ;", tentacle ; p, s, c, cirrhi. 



Fig. 11. Branchial tuft. 



Fig. 12. Prehensile organ on ventral surface. X 25 diam. 



Fig. 13. One of the setae of prehensile organ. X 50 diam. 



Fig. 14. One of the seta; of feet. X ditto. 



