252 THE AMPHINOMID.E, APIIRODITIDyE, POLYNOID/E, AND SIGALIONIDiE 



specimens of the species. The colour varies a good deal while retaining 

 all its essential characteristics, and in some individuals the dark brown 

 appears to be more of a purple. I am inclined to believe that the 

 natural colour is a purple rendered a rich brown by virtue of its 

 intensity. Some of the individuals taken showed this very clearly, 

 and in one case one half of the body was conspicuously lighter than 

 the other. 



The ventral surface is practically colourless except for a very strongly 

 marked longitudinal line of bright red. 



Elytra. In shape they are sub-circular, and some few reniform. 

 From a certain variation in size it may be assumed that they are 

 lost and replaced with comparative ease, though this is hardly borne out 

 by the circumstances connected with their capture and preservation. 

 The surface and margin are both smooth. Under the microscope a 

 light brown pigment is visible over the entire surface of the elytron, 

 and differs only in density from the visibly pigmented area. This 

 pigment is deposited in small circular patches, each having a lighter 

 spot in the centre. From the area of attachment the nerve runs in 

 an arborescent manner over the entire elytron, the branching being 

 very close and delicate. 



Peostomium. Broad; the posterior portion is pigmented brown 

 (in spirit). It consists of two ovoid lobes separated anteriorly by a 

 median depression, which loses itself about half-way back. The 

 tentacles are continuations forward of the prostomium, and their 

 proportionate lengths seem to vary somewhat. The four eyes are 

 postero-lateral in position, but not in contact with the margin; the 

 anterior are slightly larger than the posterior. 



Parapodia. Elongate, with the notopodium rudimentary. 



First foot. The notopodium consists of a mere papilla, with a slender 

 and tapering cha;ta. The neuropodium is well developed and sub- 

 conical. It is provided with some thirty or more slender chtetce. The 

 spinulose region of these is bent backwards and long. The apex is 

 apparently truncate, but there are evidences of a minute cleft. The 

 more ventral chajtse are shorter; the spinulose border is turned 

 ventralwards. The ventral cirrus is very long. 



The second foot is very similar; the ventral cirrus reaches beyond 

 the neuropodium, and the dorsal cirrus extends very considerably 

 further. The chajtae do not present any striking differences. 



In the typical feet the notopodium increases in size for the stout 

 part of the animal's body, and may carry four or five long, slender 

 choBtffi with no serrulations. In the neuropodium three groups of 

 chatae may be made out: an upper group, where the chsetc'e are few 

 in number, long and slender, and with the spinulose region pro- 



