110 CRUSTACEANS OF THE 



Length of the terminal joint of the abdomen 3 



,/ »/ // penultimate segment 2^ 



Breadth of the anterior margin of this segment .... 2| 



V // // posterior „ ,, „ ,, .... 2', 



Breadth of the orbits 3| 



Height of . „ 2 



Horizontal length of the larger hand 14 



» It H H fingers ^\ 



Height of the larger hand 6 



Length of the legs of the penultimate pair 45 



» // » meropodites of this pair 15 



Breadth „ " „ » « „ 3 



Length of the propodites « » 10 



Breadth , » „ „ ; « 2 



Length of the dactylopodites » » // 10 



Potamon {Geothelphusa) kenepai, n. sp. 

 (Plates 10 and 11, Fig. 12). 



One single male collected, January 1894, in a forest 

 on Mount Kenepai. 



Though this specimen bears a close resemblance to Pot. 

 hendersonianum n. sp., it is to be considered, I think, as a 

 different species. 



The cephalothorax is subquadrate, little broader 

 than long, the greatest width being in proportion to 

 the length about as 5 : 4 and the distance between the 

 outer angles of the orbits being but little shorter 

 than the length of the cephalothorax. The branchial region, 

 moreover, is somewhat expanded laterally, so that 

 above the legs of the antepenultimate pair the cephalothorax 

 appears almost just as broad as at it greatest width. The 

 carapace is moderately convex anteriorly, depressed poste- 

 riorly and the interregional furrows are rather deep. The 

 deep cervical groove is interrupted, as in so many other 

 species ; the anterior portions directed towards the epibran- 

 chial teeth, would make a right angle with one another 

 when prolonged backwards. Rather deep depressions sepa- 

 Notes frora tlic Leyden IMuseum, Vol. X!XI. 



