POLLICIPES POLYMERUS. 311 



ments, by a band of thin membrane. The tunic of the 

 basal part of the sack, where it enters the peduncle in a 

 blunt point, is thickened and covered with roughened 

 rounded papillae. The corium of the sack under the 

 valves, is coloured (after spirits) so dark a brown as to 

 be nearly black ; the cirri and tropin are similar, but 

 with a tinge of greenish-purple. 



Filamentary Appendages. — Of these there were, on the 

 prosoma of one specimen, twelve pairs, and in another 

 specimen fourteen pairs, seated in two approximate rows ; 

 the middle filaments are the longest, equalling about half 

 the diameter of the thorax : each is flattened, and tapers 

 but little towards its summit, which is roughened with 

 microscopical crests serrated on both sides ; on the summit, 

 also, there are a few bristles and some very short, thick, 

 minute spines. These appendages are directed rather 

 towards each other, and towards the thorax. 1 do not 

 doubt that their numbers vary according to the size of 

 the specimen. I believe that they are occupied by testes. 

 Outside these filaments, on each side of the prosoma, there 

 are two very irregular rows of papillae, intermediate in 

 length between the filaments and the rounded swellings 

 at the bottom of the sack. Beneath the basal articulation 

 of the first cirrus, there is on each side, a short appendage, 

 with a few bristles on its summit. Lastly, on each side of 

 the middle of the mouth, on the prosoma, there is a longer 

 appendage, dark-coloured, furnished with a few scattered 

 bristles on its sides and apex, and directed upwards and 

 a little towards the adductor scutorum muscle. 



Mouth. — Labrum highly bullate, but with the upper- 

 most part not more bullate than the lower part, and there- 

 fore not overhanging it ; basal margin much produced ; 

 crest with some small blunt teeth and some bristles. 

 The inner fold of the labrum is much thickened, yellow, 

 punctured, and with a tuft of fine bristles on each side. 



Palpi, approaching each other but not touching, club- 

 shaped, or with broad and square extremities, thickly 

 fringed with serrated bristles. 



