DESCRIPTION OF THE PLATES. 



FEONTISPIECE. 



Fig. 1. Group of Phimutdhe. The figure to the right is of natural size ; 

 that to the left is magnified, and shows one animal contracted 

 and two expanded, with their ciUated tentacles in activity. 

 The gi-oup is fixed on a stem of sea-weed. (Copied from Milne 

 Edwards.) 



... 2. A Cjidippe slightly magnified ; the streamers contracted. 



... 3. A iV^oc<t7wca il/itoWs greatly magnified. The circular spaces are 

 vacuolse, filled with granules of food ; these are only temporarj-, 

 and are sometimes not visible at all. (Copied from Quatre- 

 fages.) 



... 4. Group of Clavellince, about three times the natural size, rising 

 from a creeiiing stem. The two orifices open and shut rhyth- 

 mically to suck in and eject water. The lace- work .stinicture 

 is richly ciliated, and is supposed to represent the gills of the 

 animal. (Copied from Mr Gosse.) 



PLATE 11. 



Fig. 1. An Eolis coronata. 



... 2. A Doris Johnstoni. The two horn-like processes on the head are 

 the antenni3C which retract, when the animal is touched, or re- 

 moved from the water ; the coronet at the other end is the 

 circle of bi-anchial plumes. 



... 3. A Phitlas dactyl us, or rather the shell of one. (Figs. 1-3 copied 

 from Woodward's Mollusca.) 



... 4. An Aphjsia. The gills are seen under the fold of the .skin, to 

 the right. (Copied from Milne Edwards.) 



... 5. A Teredo Nui-refjica removed from its .shell. (Copied from 

 Woodward's Mollusca. ) 



