314 



POLYCHAETA 



cesses yellow. It lurks, during day, under stones and shells, etc., 

 in the Laminarian zone. The green egg masses, so frequently 

 referred to as belonging to Arenicola, are laid by Phyllodocids. 1 



FIG. 165. Phyllodoce paretti Blv. x i. (From Recjne Animal.) 



Iii Eulcdia an additional (fifth) tentacle arises from the 

 middle of the back of the prostomium. E. viridis Mull, is a dark 

 green worm smaller than the preceding ; common 

 between tide-marks, hiding in cavities and tunnels 

 in limestone rocks, which have been bored by 

 the mollusc Saxicava ; it is rare where such 

 rocks are absent. It might have been thought 

 that its vivid colour would harmonise with its 

 surroundings, but it is most abundant in regions 

 where Fucus abounds and Ulva is absent. It is 

 evident then that the colour is not protective ; 

 it may perhaps be of warning significance, for 

 the mucus secreted in quantities by glands on 

 the cirri of the Phyllodocids is probably ob- 

 jectionable to their enemies. Phalacrophorus 

 Grf. and Pontodora Grf. may be mentioned as 

 pelagic genera. 



Sub-Fam. 2. Lopadorhynchina. This in- 

 cludes small forms, Lopadorhynchus Gr., Pela- 

 gobia Grf., and other pelagic genera. 



Sub-Fam. 3. Alciopina. These are surface 

 FIG. 166. Naupkcmta forms > and > lik e most pelagic animals, are colour- 

 aud transparent ; the eyes, however, are 

 very large, and, with certain brown spots in 

 each segment, 2 are the only coloured parts in 

 the body ; in structure the eyes are much more complicated than 

 1 According to a verbal communication from Mr. J. Hornell of Jersey, they belong 

 to P. Diaculata Mull. , while Mr. Garstang believes them to belong to Eulalia viridis. 

 * These segmentally-arranged brown spots may perhaps be photogenic. 



celox R. Grf. x 4. 

 (From Greef.) e, 

 The large eye. 



