CRUSTACEA WHITELEGGE. 135 



denticle of the finger, the next in line with the basal denticle, the 

 third opposite the space between the fingers, and the fourth in a 

 line with base of the mobile finger. Between the first and second 

 rows, and opposite the middle tooth of the immobile finger, is 

 situated a short line of three granules ; one of these granules is 

 on the finger. On the upper surface are situated two rows, one 

 extending from a notch above the articulation of the middle 

 finger to the articulatory boss where the hand joins the carpus, 

 the other opposite to the superior base of the mobile finger. The 

 crest has four or five spiniform granules, which are similar to 

 those on the rest of the .palm. The inner surface of the palm is 

 convex, with a few small granules near the centre and several 

 long hairs. Hand, with the lower border of palm, twice as long 

 as the upper (immobile finger excluded) and as broad distally as 

 the carpus is long. The immobile fingers are bent downwards, 

 faintly sulcate, deeper coloured in their distal halves only ; armed 

 with six denticles, the three proximal ones a little larger than the 

 distal. The mobile fingers are faintly denticulate on their edges; 

 they are granuloss above at the base, but elsewhere the surface 

 is smooth. 



The merus joints of the ambulatory legs are compressed and 

 sharp edged above, rounded below and smooth, excepting the last 

 pair which are finely granulose below, as are also the ischium 

 joints distally. There is a well marked transverse groove near 

 their distal end. 



The carpus joints are armed with two rows of spinules, the 

 superior one consisting of six or seven spines, somewhat equi- 

 distant but unequal in size. The second row is situated on the 

 median posterior surface, and consists of four or five spiniform 

 granules. On the propodal joints, in a line with the latter, are 

 also five similar spinules. At the distal ends of the propodal 

 joints of the first pair there are three spines superiorly and two 

 laterally ; in the succeeding pairs they are indicated by granules. 

 Tarsi shorter than than the preceding joints, fringed above and 

 below with long hairs and terminating in a slightly curved horny 

 point. 



The post abdomen is smooth, shining, and distantly punctate, 

 its edges fringed with long hairs in the female, and with very 

 short ones in the male. The terminal segment in the latter does 

 not extend beyond the articular nodules of the first joints of the 

 chelipedes ; if a line is drawn from one nodule to the other across 

 the sternum, it would pass clear of the tip of the seventh joint. 

 This character appears to be important, and may be of use in 

 separating the species of this most difficult genus into groups. 



I have examined most of the males in the Museum Collection, 

 the results are as follows : in twelve males of Pilumnus rufo- 

 punctatus and in the type of P. monilifera the seventh segment 



