96 DR. .T. G. DE MAN ON A NEW FllESHWATEB [Feb. 19, 



of the orbits and the granulated tooth between the extraorbital 

 and epibranchial angles are covered and concealed by it. The 

 furrow between the postfrontal crest and the upper margin of the 

 orbits is very concave and deep (Plate X. fig. 2). 



The whole upper surface of the carapace is smooth and shining, 

 and presents, under an ordinary lens, a very fine punctuation, but 

 is nowhere granulated. The orbits (fig. 2) are large, their width 

 measui-es three-fourths of the free border of the front, and they 

 are one and a half times as broad as high. In a front view 

 of the carapace (fig. 2), the somewhat concave external portion 

 of the upper margin of the orbits runs obliquely downwards ; 

 whereas the lower margin, which is somewhat punctate but other- 

 wise smooth, has a transverse dii'ection, being but very little 

 arcuate ; the lower margin of the orbits shows a deep notch or 

 hiatus just below the extraorbital tooth. The superior margin of 

 the orbits and the free edge of the front are also smooth. 



The suborbital area is separated by an arcuate, rather deep 

 sulcus from the subbranchial region; the posterior margin of 

 this groove is granulate or crenate, presenting about twenty rather 

 small crenulations ; there are three or four granules on the sub- 

 orbital area close to the groove that separates it from the branehio- 

 stegite, but for the rest this region and the branchial floor also 

 are smooth. The branchiostegite bears a few smooth, rounded 

 granules on its anterior extremity (fig. 2), and the suture that 

 separates it from the subhepatic and subbranchial regions is 

 bordered by a row of granules that gradually grow smaller from 

 before backwards ; its anterior part is rather deep. 



The epistome is smooth. The median triangular process of its 

 posterior border is large and salient, and its lateral margins have 

 seven or eight coarse granules on each side ; the slightly concave 

 external portions of the posterior border of the epistome are 

 smooth and rather sharp, but the median process bears also a few- 

 granules on its surface. For the rest the epistome, the basal 

 plate, and the basal joints of the outer antennae are smooth. 



The ischium of the external maxillipede (fig. 4) is smooth, rather 

 coarsely punctate, and has a deep furrow that does not reach to 

 the anterior margin of this joint but ends just behind it ; it runs 

 distinctly somewhat closer to the internal than to the external 

 margin, and almost parallel with the former ; the merus-joint is 

 also smooth and finely punctate, though somewhat more coarsely 

 on the thickened posterior margin. 



The sternum shows a fine, not close punctuation, but is for the 

 rest smooth ; quite anteriorly a transverse groove unites the 

 postero-external angles of the ischium-joints of the outer foot- 

 jaws with one another. Along the insertion of the chelipedes the 

 lateral margin of the sternum is thickened or raised, just as in 

 P. infravallatum Hilg. (Hilgendorf, I. c. fig. 2 a). 



The male abdomen (fig. 6) resembles that of P. suprasulcatum 

 Hilgendorf (I. c. fig. 5 a). The terminal segment is triangular 

 with obtuse extremity ; the lateral margins are somewhat concave 



