PLATE XL. 
Fig. 1. Hydlincecia tuhlcola, var., inverted in its tube (from 
Station 320), ..... About natural size. 
Fig. 2. Sixty-third foot of Hyalinoecia tubicola, var. longibranchiata, . x 25. 
Fig. 3. Anterior dorsal region of Hyalinoecia benthaliana, . . Enlarged. 
Fig. 4. Anterior dorsal view of Nothria minutd, .... Enlarged. 
Fig. 5. Nothria sombrennana^ in a hyaline tube strengthened with large 
sponge-spicules, ...... Enlarged. 
Fig. 6. Anterior dorsal view of the same species. The tentacular cirri 
have been accidentally omitted, .... Enlarged. 
Fig. 7. Twentieth foot of the foregoing, . . • . . . x 25. 
Fig. 8. Anterior dorsal aspect of Nothria tenuisetis, . . . Enlarged. 
Fig. 9. Thirtieth foot of the foregoing, . . . . . x 25. 
Fig. 1 0. Tube of Nothria abranchiata, .... About natural size. 
Fig. 11. Head and anterior dorsal region of the same, . . . Enlarged. 
Fig. 12. Thirtieth foot of the foregoing, . . . . . x 25. 
Fig. 13. Nothria 'pycnobranchiata, in tube, . . . Slightly enlarged. ■ 
Fig. 14. Head and anterior region of the foregoing, . . . Enlarged. 
Fig. 15. Posterior foot of the foregoing, indifferently preserved, . . x 25. 
1 The artist has omitted the shading between the tentacles. 
