250 DR. UAIRD ON TWO NONDESCEIPT LA.UVAL ANNULOSA. 



Fig. 7 d. Ventral seta of ditto, of Chloeia tumida. X 50 diain. 

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

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



Plate V. Theiisella flava. 

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

 Fig. 2. Ventral aspect. Ditto. 

 Fig. 2 a. Natural size. 

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

 Fig. 4. Tuft of (?) branchial setse 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 setai of the feet. X ditto. 

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

 Fig. 8. One of the setas which are found interspersed amongst the ordinary 



seto! of the feet. X ditto. 

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



the granular structure 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 surface. X 25 diam. 

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



in fig. 9. X 400 diam. 



Plate VI. Thetisella olivacea and Hippono'e Cranchii. 



Fig. 1 . TJtetisella olivacea, dorsal yiew. X two-thirds. 



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 setiB 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 larvse of insects. 

 Supposing these animals to be larvse, a, a, are the antenna; ; m x, m x, 

 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 setse : lhr,is the labrum ; I b, the labium ; It, It, la- 

 bial tentacles, composed of a basal joint and two setoe. 



Fig. 5. One of the 8ota3 of feet. X 50 diam. 



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



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



Fig. 8. Hippono'e Cranchii, ventral aspect. X ditto. 



Fig. 8 a. Hipjponoe Craiichii. Natural size. 



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



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



a, antennaj ; p, palpi ; t, tentacle ; p, s, c, cirrhi. 



Fig. 11. Branchial tuft. 



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



Fig. 13. One of the seta; of prehensile organ. X 50 diam. 



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



