24 



between the cardiac and branchial regions can be traced as a 

 very faint curved ridge which fades away altogether in front. 

 The hind margin is not so markedly concave as in the species 

 already described, and is quite devoid of spines. The whole 

 surface of the carapace is covered with very minute tubercles 

 or granules. The median carina of the carapace is formed of a 

 double row of large granules, and is furnished with very few 

 spines. These are rather variable in number. In the Helga 

 specimen there are three single spines between the rostrum 

 and the cervical groove ; in Alcock's specimen there is a single 

 spine, a double, and another single ; in Faxon's specimen two 

 double spines and a single. In Bouvier's P. eryoniformis, which 

 is probably a synonym of P. granulatus, there are two single 

 spines in front of the cei^ical groove and two double ones 

 behind it ; none of the others have spines behind the groove. 

 The submarginal carinae are very indistinct, the upper and 

 outer one particularly so. 



The abdominal segments are also granular. There are median 

 carinae on the first five segments. The first three come to more 

 or less sharp points which are directed forwards ; the fourth is 

 not produced to a point at all, and the fifth is reduced to a 

 mere blunt ridge. The sixth segment is quite smooth. On the 

 basal part of the telson there is a blunt tubercle, but no spine. 

 On the second to fifth segments there is a groove sloping up- 

 wards and forwards from the postero-lateral angle of the tergum 

 towards the median lilie. The pleura have smooth edges and 

 are of the usual relative sizes. 



There is a spine on the anterior end of the eyestalk. 



The antennular scale is very broad ; its inner edge is furnished 

 with four or five teeth. The tip of the scale is bent inwards and 

 upwards and ends in a long sharp point. There is a single spine 

 at the outer angle of the basal peduncular joint. 



The antennal scale is leaf -like, with a blunt tip, which does 

 not quite reach the end of the peduncle. In Faxon's specimen 

 the antennal scale is longer than the peduncle, in Alcock's 

 " almost as long as the peduncle." 



The oral appendages are very similar to tliose of P. typhlops 

 and P. sculptus. 



The chelipeds are considerably longer than the body and 

 are compressed. The merus has a row of fairly prominent 

 spinules on its lower edge ; they decrease in size towards the 

 distal end. At the latter there is a single cui*ved spine on the 

 dorsal side, which also bears a row of very minute spinules. 

 The carpus has an upper and a lower distal spine. The propodite, 

 which is slightly longer than the menis, has a spine at the 

 base of the dactyl and both its edges are spinulose. 



The other pairs of pereiopods and the abdominal appendages 

 present no points of difference from those of the three species 

 already described. 



Size. — The single specimen taken by. the Helga measures 



