POLLICIPES ELEGANS. 305 



ternal margin of the carina is here rounded, instead of 

 being square, as is generally the case with P. cornu- 

 copia. The strong membranous margin of the orifice of 

 the sack, in its upper part, is almost one third as wide as 

 the widest part of the terga, whereas in P. cornucopia it 

 is only one fourth of this same width. The peduncle 

 apparently is rather longer, compared with P. cornucopia, 

 and the calcareous scales on it perhaps a little larger 

 in proportion. 



In a very young specimen, with the capitulum barely 

 exceeding ^th of an inch in length, T could distinguish 

 the sub-rostrum, sub-carina, the upper, and some of the 

 lower latera. 



Filamentary Appendages. — These, in a medium-sized 

 specimen, are arranged on the prosoma in four longi- 

 tudinal approximate rows, there being twelve in each 

 row ; those in the two outer rows are only half the length 

 of those in the two inner rows ; those nearest the thorax 

 are the longest ; there are some papillae outside the outer 

 rows. In a very large specimen with its capitulum 13 in 

 length, these filaments were very much more numerous, 

 and some were placed on the first segment of the thorax, 

 and at the bases of several of the posterior cirri. Some 

 of the filaments are bifid, trificl, and even branched. In all 

 the specimens, at the bases of the first pair of cirri, there 

 are, on each side, a pair of filaments, (one below the 

 other,) pointing upwards, less than half as long as those 

 on the prosoma : also on each side of the mouth, there is a 

 longer and thicker filament, pointing upwards, with a 

 few very minute scattered spines on it ; the apices of these 

 three pair of filaments, as w 7 ell as of some of the others, 

 are roughened with very minute pectinated scales. All 

 these filaments were gorged with the branching testes. 



Mouth. — The parts are closely similar to those in P. cor- 

 nucopia; in the mandibles, the interspace between the 

 third tooth and the inferior angle, is slightly pectinated : 

 in the maxillae, there are six or eight pairs of spines 

 between the tw r o upper tufts of fine spines. 



20 



