95 



Dimensions in mm. ^) : 



Distance between external orbital angles 

 Maximum breadth of carapace 



Length of carapace 



Width of anterior margin of front . 

 Horizontal length of chela 



Height of palm 



Breadth of exognath of external maxillipeds 



Breadth of ischium of external maxillipeds 



Breadth of base ) 



J of penultimate segment of abdomen 

 Length \ ^ "^ 



Length of terminal segment of abdomen 



Length of meropodite 



Breadth of meropodite 



Length of carpo- + propodite 



Length of'dactylus 



, of penultimate pair of legs 



9-3 



10.8 



8.8 



5-3 

 9-9 

 5-5 

 1.4 

 I.I 



2.2- 

 I.I 



1-7 



6.2 



1-7 



6.2 



3-3 



Pyxidognathus A. Milne-Edwards. 



A detailed discussion of this genus, together with the description of a new species, is 

 now under press and will be published in the "Zool. Meded. Mus. Leiden'. JS', /i/^//^-^^^' '^'' / 

 No representatives were collected by the "Siboga" expedition. 



Utica White. 

 1847. U/ica White. Proc. Zool. Soc. London, 1847, p. 86. 



In the shape of the much flattened carapace and of the prominent front the genus much 

 resembles Ptychognathus^ but the merus of the external maxillipeds is not at all auriculate at 

 outer ano-le and the exognath is much narrower than the ischium. 



White knew only a single species; two species were added by A. Milne-Edwards (1873), 

 two by H.^SWELL (1S82) and two by de ]\L\n (1895). With exception of both species of Haswell 

 all are livingr in freshwater. 



Key to the species : 



1. Two sharp epigastric ridges ("lobes protogastriques" A. 



Milne-Edwards) 2 



No epigastric ridges present 3 



2. Antero-lateral teeth of carapace acute; external orbital angle 



as Ions: as following- tooth U. barbimana A..Milne-Edw. ") 



Antero-lateral teeth of carapace rectangular; external orbital 

 angle somewhat longer than following tooth and directed 

 somewhat inward U. borneensis de Man ^) 



1) Measured under microscope. 



2) Nouv. Arch. Mus. Paris, t. 9, 1873, p. 297, pi. 14, f. 4. Hab. New Caledonia. 



3) Zool. Jahib., Syst., Bd 9, 1895, P- "S, Bd 10, 189S, pi. 28, f. 25. H.-ib. Pontianak (Borneo). De Man liimself admitted 



( 



95 



