96 CRUSTACEANS OF THE 



ever, the granulation is visible over the whole 

 upper surface of the carapace. 



In the type-specimens of Pot. sinuatifrons^ on the con- 

 trary, the upper surface appears almost everywhere 

 smooth, there are only small granules on the front and 

 on the extra-orbital tooth, while oblique rugae cover the 

 lateral margin of the carapace. 



The orbits are transverse, almost twice as broad as high 

 and their width measures two thirds the breadth of the 

 frontal margin ; the lower border that is obscurely crenu- 

 late and more curved than in Fot. sinuatifrons, presents, 

 as in this species, just below the outer angle of the orbits, 

 a small triangular hiatus. 



The epistome almost agrees with that of Pot. sinuati- 

 frons. It is smooth, like its anterior and posterior margin ; 

 the process in the middle of the latter is formed chiefly 

 by the median palatal ridge. The lobe at the anterior ex- 

 tremity of the lateral margins of the buccal frame appears 

 regularly curved and distinctly crenulate in Pot. sinuatifrons, 

 but in the new species it is angular and quite smooth 

 (vide Fig. 8« and Fig. 9^). 



The subhepatic region is marked in the middle with a 

 transverse row of granules that are partly confluent and 

 so constitute a rather salient, transverse ridge, 

 some other granules are lying around it. The floor of the 

 branchial chamber is densely covered with finely granu- 

 lated, short oblique rugae and is distinctly defined by a 

 groove from the subhepatic region ; the brauchiostegite 

 is rugose externally and a row of small granules is seen 

 along the furrow that separates it from the subhepatic area. 



The outer maxillipedes fully agree with those of Pot. 

 sinuatifrons. The furrow on the rather densely punctate 

 ischium-joint runs a little closer to the internal 

 than to the external margin and proceeds from 

 the posterior to the anterior margin of the joint. 



The abdomen is densely punctate. 



The right chelipede is somewhat larger than the left. 



Notes from the Lieyden Mnseuin , Vol. XXI. 



