S. I. Sinith oil Brazilian Crustacea. 5 



eral margin is smooth and even and tlie lobes separated by very slight 

 incisions, and the edge of the first lobe is slightly convex and does not 

 project at the angle of the orbit ; there is no noticeable depression be- 

 tween the median and posterior lobes of the branchial region ; the in- 

 ferior margin of the orbit is divided by a very slight sinus, and the 

 inner lobe is not at all prominent ; and finally, the external maxilli- 

 peds are slightly granulated. The color of alcoholic specimens is quite 

 different, being dark slate-brown on the upper side of the carapax and 

 chelipeds. 



The P. crenatus of Edwards and Lvicas is a much smoother species 

 than the politKS, the regions being scarcely at all defined and the car- 

 apax almost perfectly smooth along the front and antero-lateral bor- 

 der. The front is not deflexed, its edge is nearly straight, and beneath 

 it is expanded horizontally in front of the antennulse ; the sub-orbital 

 and sub-hepatic regions are quite smooth, and there is no tubercle be- 

 neath the first lobe of the antero-lateral margin ; and finally, the an- 

 tero-exterior angle of the merus of the external maxillipeds projects 

 laterally somewhat beyond the lateral margin and is broadly rounded.* 



Panopeus Harttii Smitii, loc. dt., p. 280, i869. 



Plate 1, figure 5. 



The carapax is clothed with scattered hairs along the borders, is 

 broadest at the penultimate teeth of the antero-lateral margins, con 

 vex anteriorly but flattened behind, and coarsely granulous on the 

 front and along the lateral borders, but nearly smooth on the median 

 and posterior regions. The gastric region is surrounded by a very 

 deep sulcus, which is particularly marked posteriorly next the cardiac 

 and the posterior part of the branchial region ; its median lobe is sep- 

 arated from the antero-lateral lobes by a slight but distinct sulcus ; 

 and the anterior lobes are prominent and marked anteriorly by a sharp 

 plication. The hepatic region is pi-ominent, somewhat projecting and 

 bears a transverse, granulous ridge. The cervical suture is very 

 marked and extends as a broad depression quite to the gastric region. 

 The median and posterior lobes of the branchial region are separated 

 by a slight depression. The front is very much deflexed and the edge 



* The figure of the facial region of this species given in the Voyage dans VAmerique 



Meridionale (pi. 8, fig. 1 a) improperly represents the external maxillipeds with this an- 

 gle truncate and not at all produced laterally. 



