NOTES ON SOME OF THE POLYCHiETA. 353 



Plate VIII. 



Figs. 1-4. Hermadion assimile^ Mcintosh. 

 Figs. 5-9. Pectinaria helgica, Pallas. 



Fig. 1. Head and part of the everted pharynx of H, 

 assimile, x 10 diameters. 



Fig. 2. Vertical section of ventral surface of i3. assimiie, x 

 50 diameters, h. Nervous system. 



Figs. 3 and 4. Ventral papillae of H, assimile, x 300 diame- 

 ters. ' 



Figs. 5 and 6. P. helgica, after Pallas enlarged ; a. Comb. 



Fig. 7. P. helgica, after Miiller (his P. aitricoma); enlarged. 



Fig. 8. P. helgica, after Malmgren ; enlarged. 



Fig. 9. P. helgica, from a specimen in the L. M. B. C. 

 collection ; enlarged. 



