128 CARL BOVALLIUS, THE OXYCEPHALIDS. 



qui ne deborde pas ses parois laterales et qui semble etre le vestige de 

 la derniere paire de pattes. Les autres pattes portent en dedans et & 

 leur base, des grandes lamelles ovalaires, placees longitudinalement sur 

 les cote's des segments thoraciques et qui, en se croisant par leurs 

 bordes, servent de receptacle aux oeufs et anx jeunes. L'abdomen est 

 compose de six segments dont les trois premiers sont assez grands et 

 portent chacun une paire de fausses pattes courtes, a tige tres-large et 

 terminee par deux filets cilies. La queue est formee par les trois articles 

 suivants qui sont allonges, minces, cylindriques, epineux en dessus et 

 en dessous, les Opines superieures e"tant beaucoup plus petites que les 

 inf^rieures; les deux premiers portent a leur extremite* posterieure de 

 fausses pattes a tige tres-longue et tres-grele, et terminees chacune par 

 deux filets cilies et fort courts 1 ), le dernier 2 ), aussi long que le prece- 

 dents, se termine en pointe aigue.D 



les jeunes Oxycephales sont tres-differents des adultes 

 et ont une assez grand ressemblance avec le genre Pronoe.y) 



This description and the excellent drawing clearly prove that the 

 animal examined by EYDOUX, SOULEYET, and GUERIN-MENEVILLE was a 

 Xiphocephalus Whitei and not a X. armatus. 



The description given by STREETS in 1878 agrees, in the charac- 

 teristics recorded by him, with the features shown in the specimens 

 which have been the types for my desription below. 



Moreover the short description of Rhabdosoma armatum given by 

 STEBBING in 1888 shows that his specimens A, B and C must be referred 

 to Xiphocephalus Whitei. 



Lastly I must- refer to the new species Rhabdosoma investigator is 

 proposed by G. M. GILES in 1887. He does not give any description 

 of the species but a very good drawing which is reproduced here on 

 a somewhat reduced scale. Notwithstanding the differences, which he 

 points out under five heads, at least the specimen figured is a true Xi- 

 phocephalus Whitei, as is easily seen on a comparison -with the 

 drawing of an adult male given below (PL VII, fig. 9). GILES erroneously 

 considers the specimen figured by him to be an adult female, and says: 



1) They do not mention the second pair of uropoda although this pair are 

 distinctly given in their drawing. 



2) The telson. 



