PLATE OXIII. 



Fig. 



1. Lateral view of Melinna palmata, Grube. Enlarged, 



2. Amphiirite scylla, Savigny, from Plymouth. Enlarged. 



3. Leprea lapidaria, L. } from the ventral surface. Enlarged. 



3 a. The same viewed laterally. Enlarged. 



4. Pelagic young of Terebella. First stage, x 50. 



4 a. Pelagic young of Terebella. Second stage. X 50. 

 4 6. Pelagic young of Terebella. Third stage. X 50. 



5. Ventral aspect of the collar-region of Bispira volutacornis, Montagu. Enlarged. 



6. Portion of sand-tube of young Lagis Koreni, Malmgren, continuous with the larval 



transparent sheath. Observed and photographed by Mr. Arnold Watson. 

 Magnified. (Vide p. 55.) 



