95 



Dimensions in mm. x ) : 



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 



■ T . of penultimate segment of abdomen 



Length \ r ö 



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 



io.S 

 8.8 

 5-3 

 9-9 

 5-5 

 1.4 

 r. i 



2.2 

 I.I 



i-r 



6.2 



i-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". 

 No representatives were collected by the "Siboga" expedition. 



Utica White. 

 1847. Utica 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 Ptyckognathus, but the merus of the external maxillipeds is not at all auriculate at 

 outer angle 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 Haswell (1882) and two by de Man (1895). With exception of both species of Haswell 

 all are living 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 long as following tooth I T . barbimana A. Milne-Edw. '-) 



Antero-lateral teeth of carapace rectangular; external orbital 

 angle somewhat longer than following tooth and directed 

 somewhat inward U, bornccnsis de Man 3 ) 



1) Measured under microscope. 



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



3) Zool. Jahrb., Syst., Bd 9, 1895, p. 118, Bd 10, 1898, pi. 2S, f. 25. Hab. Pontianak (Borneo). De Man himself adniitted 



95 



