the British Pandalidse. 31 



in some very small individuals of this species (about 25 millim. 

 long) the outer edge of the antennal scale was found to be 

 slightly concave, as in the adult P. propinquus. 



The third maxillipeds (PL IT. fig. l,d) have no exopod 

 and the terminal joint is about \\ the length of the preceding. 

 Of the second perceopods (PI. III. fig. l,f) that on the right 

 side reaches a little beyond the tip of the antennal scale when 

 extended forwards. The carpus is divided into about 20 

 segments by ambulations which are most distinct distally. 

 The merus shows about four indistinct annulations at its 

 distal end. On the left side the second leg extends beyond 

 the tip of the rostrum for about i to ^ the length of the 

 carpus. 



The remaining peneopods are rather stout and have the 

 dactyl, especially in the last pair (PI. IV. fig. 1,^), short 

 and thick. The third legs reach a little beyond the tip of 

 the antennal scale, while the last pair hardly reach beyond 

 the middle of the scale when extended forwards. 



In the first pleopods of the male the endopod (PL IV. 

 fig. 1, h) is produced distally and internally into a process 

 tapering to a point and armed on its inner edge with a group 

 of retinacula. Externally at the base of this process the outer 

 border of the endopodite forms a rounded shoulder or external 

 lobe, which in this species is not further produced. The 

 internal margin of the endopod is armed in its distal part with 

 a number of stout spines. While the form of appendage just 

 described, which agrees with the figure given by Kroyer (L c. 

 fig. 3, d), appears to be the typical one for this species, I have 

 met with three specimens (collected together in one locality, 

 Easthaven) in which the shape of the endopod is different 

 (PL IV. fig. 1, A'). The inner process is club-shaped, narrow 

 at the base and swollen at the fip, and it projects somewhat 

 inwards from the inner edge of the endopod. The outer lobe 

 is narrower and more piominent than in the typical form, 

 though still much shorter than the internal process, and the 

 spines on the inner edge of the endopodite are very short. 

 Both the inner and outer borders of the endopod are more 

 convex, or, in other words, the endopod as a whole is ovate 

 or lanceolate rather than oblong. The specimens showing 

 this form of appendage are of different sizes and appear to 

 present no specific differences from typical specimens of 

 P. Montagui. It is possible that the characters mentioned 

 may be clue to immaturity, but unfortunately the material at 

 my disposal is not sufficient to elucidate this point. I have 

 also examined a specimen, apparently full-grown, in which 

 the first pleopod on the right side had the endopod of the 



