1368 



CRUSTACEA. 



of carapax. The acute points on its posterior side are situated directly 

 over the bases of the stylets. Suction disks as in the preceding. The 

 posterior pair of disks is attached to the same segment with a pair of 

 natatories, and not to the carapax; and this is probably the case also 

 in the concinnus. 



The anterior antennae have very short setae on anterior margin of 

 first joint, and also at apex of second, as in figure. 



The first pair of prehensile feet has the basal portion shorter than 

 the following. The second pair is very stout, and consists of a very 

 thick and broad base, much broader than long, which diminishes to a 

 narrow neck, and then enlarges somewhat, and bears an obtuse im- 

 moveable finger and a short emarginate moveable finger. 



The anterior natatories have the basal joint shorter than broad ; 

 the shorter branch is two-jointed, the other three-jointed. The second 

 pair has a two-jointed base, the second large and oblong, and attached 

 to the venter by the greater part of its anterior side. The two 

 branches each two-jointed. The third and fourth pairs broad lamellar, 

 the third with the branches two-jointed, the fourth with each an 

 undivided plate. 



The last segment of the abdomen is situated under the articulation 

 of the preceding with the first, and is small, quadrate in form, bearing 

 the stylets from its posterior angles. They have a minute spine on 

 the inner margin towards apex, and another smaller towards the base. 

 At the outer basal angle there is a minute prominence. 



This species is near the P. Oranchii, but differs in the form of the 

 first abdominal segment, the acute points behind, the stylets, and the 

 large cheliform legs. The latter have not the narrow constriction 

 towards apex in these legs. 



Pandarus brevicaudis. 



Carapax vix oblongus, subellipticus, posticb valcle excavatus, anguks 

 posticis elongate productis, obtusis, segmentis 2do Mo ito transversis, 2do 

 alato, alls non divaricatis, Mo Uoque subcequis, abdomine non latio- 

 ribus, margine postico arcuato excavato. Segmentum abdominis antir 

 cum subquadratum, postice angustius, angulis posticis obliqud truncatis 

 et setd minutd extus instructis, postice subtruncatum et angustum; seg- 

 mentum secundum parvulum, transversum, stylis triplo longionous. 



