52 STALK-EYED CRUSTACEA 



fossae and from the orbits, a little outside the level of the 

 external border of the rostrum, so as to be exposed 

 between this prolongation and the lateral horns of the 

 front ; the third joint is small and cylindrical ; the fourth 

 is very long. The antennary region is about the size of 

 the buccal cavity, and the epistome is large and almost 

 square. 



The external maxillipedes are very broad ; the third 

 joint is produced at its antero-internal angle ; the fourth 

 is triangular, being broad at the outer margin. 



The first pair of legs, in the adult male, is very large, 

 and larger than the second pair of legs ; the hands are 

 thick ; the fingers, when closed, meeting only at the outer 

 margin of their points, which are toothed ; those of the 

 female are much smaller, the fingers meeting when closetl 

 throughout nearly their entire length, and are shorter 

 than the second pair. The remaining legs, moderately 

 long, diminishing gradually from the second to the fifth 

 pair, are cylindrical ; the last joint is curved. 



The abdomen is seven-jointed in both sexes. 



Range. — Mediterranean Sea, Coast of the British 

 Isles, Azores, Cape Verde Islands, West Indies, Zanzi- 

 bar ; at moderate depths. 



Synopsis of the Species. 



A. Carapace suboval. 



a. The horns of the rostrum diverging then straight, 

 or turned inwards towards their tips ; one-third the length 

 of the postfrontal portion of the carapace. — (P. antilo- 

 capra.) 



B. Carapace long and narrow. 



b. The horns of the rostrum diverging. — {P. pj-crlonga) 



C. Carapace pyriform. 



