PLATE LI 



Fig. 



1. Trypanosyllis zebra, Grube, from Plymouth. Enlarged. 



2. Pionosyllis (Typosyllis) hyalina, Grube, from Plymouth. Enlarged. 



3. Syllis gracilis, Grube, from Plymouth. Enlarged. 



4. Syllis spongicola, Grube, from Plymouth. Enlarged. 



5. Head of Odontosyllis fulgurans, Aud. and Edw. 



6. Onuphis britannica, McL, from Plymouth, removed from its tube and seen from the 



dorsal surface. Enlarged. 

 6 a. Head and anterior region of the foregoing, still further enlarged. 



