176 ZOOLOGISCHE MEDEDEELINGE N — DEEL IV. 



meropodites bears one or two similar but smaller teeth near the 

 basal end. The upper surface of the meropodites is rugose, especially 

 towards the anterior border, which latter is slightly crenulate. Carpo- 

 and propodite are more slender and more elongate than in the 

 preceding species, so that the length of the middle pairs of legs 

 distinctly exceeds the breadth of the carapace; the said segments are 

 hairy in a very characteristic manner: the anterior (under) surface of 

 the propodite has a short hairy covering, that disappears rapidly from 

 the anterior legs backward and is entirely absent in the case of the 

 last pair of legs ; besides, both margins of the propodite and the distal 

 parts of these margins of the preceding segment are fringed with 

 long hairs. The slender, falciform dactyli, which are considerably shorter 

 than the propodites, in the case of the middle pairs of legs, but equal 

 in length to these joints in the case of the first and the fourth pair, 

 are likewise fringed with hairs, that are much longer on the posterior 

 or inner margin. 

 Dimensions : 



Length of carapace 10.25 mm. 



Maximum breadth of carapace 13.5 „ 



Breadth of anterior margin of front . . . * . . . . 5. — „ 



Breadth of posterior margin of carapace 5.5 „ 



Horizontal length of palm and immobile finger . . . 10.25 „ 



Height of palm 5.5 „ 



Length of penultimate pair of legs 17. — „ 



Posterior margin of penultimate segment 1 1 3.25 „ 



Anterior margin of penultimate segment / of male J 2. — „ 

 Length of penultimate segment j abdomen j 1.5 „ 



Length of terminal segment 1.75 „ 



The single specimen, a male, was brought home from the Bay of 

 Batavia by Dr. Buitendijk, but its precise habitat, whether in fresh or 

 brackish water, is not known. As has been mentioned de Man's speci- 

 mens, from the Mergui Archipelago, were collected in mangrove-swamps. 



4. Pyxidognathus fluviatilis Alcock. 



This species, which I have not seen, seems to show a close relationship 

 to P. dëianira, and though Alcock (1. c, see p. 408) describes the cara- 

 pace as „markedly convex" this seems to be merely a question of sub- 

 jective appreciation. 



The outline of the carapace, the nearly complete absence of grooves 

 on the surface, perfectly agree in both species. The difference is lying 

 chiefly in the shape of the walking legs, the three last joints of which 



