306 POLLICIPES ELEGANS. 



Cirri. — These are in most respects similar, to those of 

 P. cornucopia. In a specimen in which the sixth cirrus 

 had eighteen segments, the shorter ramus of the first 

 pair had ten segments, of which the five lower seg- 

 ments were thick and clothed with doubly serrated spines. 

 In the second cirrus the anterior ramus had fifteen seg- 

 ments, of which the four basal ones were highly protu- 

 berant, and thickly clothed with spines. These spines, 

 and some on the third cirrus, and a few on the first cirrus, 

 have peculiar bent teeth, presently to be described under 

 P.polymerus. These singularly toothed spines are absent 

 in P. cornucopia. From the above numbers, we see that 

 the first and second pairs of cirri have more segments in 

 proportion to the sixth pair, than in P. cornucopia; and in 

 the second pair, a fewer proportional number of the basal 

 segments are protuberant and thickly clothed with spines. 



Caudal Appendages, shorter than the lower segments of 

 the pedicels of the sixth cirrus, with only four articulations; 

 rather constricted near the base. 



The Ovigerous Frcena consist of very long and pro- 

 minent folds, thinning out to nothing towards the bases of 

 the scuta, but not furnished, as far as I could see, with 

 glands, and therefore not normally functional. 



Diagnosis toith P. cornucopia. — The reddish-orange 

 colour of the valves alone suffices. There is a very slight 

 difference, in the larger proportional size of the upper 

 latera, and in the outline of the basal margin of the 

 carina. In the maxillae there is, in P. elegans, a greater 

 width between the two upper tufts of fine spines. In the 

 cirri, the segments in the first pair, are more than half as 

 many as those in the sixth pair ; in the anterior ramus of 

 the second pair, only tMIis of the segments are protuberant 

 and brush-like, whereas in P. cornucopia -ftths are in this 

 condition. 



