iQr6.] S, Kemp : Notes on Crustacea Decapoda. 371 



chela is articulated, as in P. candidits, and not fixed as in most 

 species of the genus. 



The second peraeopods (text-fig. ^d) reach little beyond the 

 end of the merus of the first pair. The merus is one third longer 

 than the ischium and more than twice the length of the carpus. 

 The dact3dus is longer than the palm and conspicuously longer 

 than the fixed finger, the fingers are of equal breadth and each 

 bears a single stout seta at its apex. The whole limb is rather 

 thickly clothed with hairs. 



The slender third peraeopods reach beyond the end of the 

 antennal scale. The carpus is a little longer than the merus and 

 as long as the propodus and dactylus combined. The fourth and 

 fifth peraeopods are shorter than the third. In the fifth pair the 

 dactylus and propodus are subequal ; the carpus is a little longer 

 than the propodus and a little shorter than the merus. 



In the male the last three segments of the thoracic sternum 

 are carinate, the carina of each ending anteriorly in a small tooth. 

 These carinae and teeth do not appear to exist in the female and 

 in neither sex is there a sternal spine extending between the bases 

 of the third legs. 



The abdominal somites are smooth, without sculpture or 

 pubescence; their pleura are rounded inferiorly. In the male the 

 endopod of each of the last four pairs of pleopods is comparatively 

 well developed and possesses an appendix interna. In the female 

 there is no appendix interna and the endopod is very small in the 

 second and third pairs, quite rudimentary on the fourth and absent 

 from the fifth. 



The telson, including the terminal spines, reaches a little be- 

 yond the end of the inner uropod. It is not sulcate above and 

 bears two pairs of lateral, spinules between which are two rows of 

 exceedingly minute denticles. These denticles can only be seen if 

 the telson is viewed obliquely from the side under a microscope ; 

 they extend from the base almost to the distal end and may be as 

 many as sixteen in number. The apex is closely similar to that 

 of P, incisiis. 



The outer uropod is shorter than the inner. It bears setae on 

 its external margin and is fully three and a half times as long as 

 broad. 



The largest of the nine specimens obtained is only 6 mm. in 

 length. No ovigerous females were found and it is possible, there- 

 fore, that all are immature. The characters are, however, quite 

 distinctive and experience with other species leads me to believe 

 that they would not change appreciably with further growth. The 

 specimens were pale in life with sparse black dendritic chromato- 

 phores. 



^%-- Po't Blair, Andamans, 2 fms. S. Kemp. 9, 45-6 mm. Types. 



The specimens were all found together in Phoenix Bay on a 

 bottom of muddv sand. 



