120 CARL BOVALLIUS, THE OXYCEPHALIDS. 



The original description of H. MILNE EDWARDS runs: 

 Tete aussi longue que tout le reste du corps, terminee par un 

 rostre styliforme tres-long, renfle au milieu dans le point occupe par 

 les yeux, puis re"trecie dans une e"tendue assez considerable, et renflee 

 de riouveau a son extr6mit6 post^rieure, ou se trouve la bouche. Antennes 

 de la premiere paire tres-petites et termin^es par une lamelle ovalaire; 

 celles de la seconde paire extremement longues et greles. Pates des 

 deux premieres paires extremement petites; le premier article de celles des 

 cinquieme et sixierne paires e"troit et semblable a celui des pates pre"- 

 ce~dentes. Les pates de la septieme paire paraissent manquer complete- 

 ment; mais il existe, au point ou elles devraient s'inse"rer, une lamelle 

 membraneuse semblable a celle fixe pres de la base des pates prece- 

 dentes. Portion poste"rieure de 1'abdomen tres-etroite; le sixieme^seg- 

 ment cylindrique, et termine par un stylet impair aussi long que le 

 corps. Les fausses pates de trois dernieres paires tres-greles, tres- 

 longues, et termiriees chacune par deux stylets. Longueur, environ 1 

 pouce. 



All characteristics in this diagnosis, except one, agree exactly 

 with the specimen, which has been the type for my description below, 

 and the characteristics of the rostrum and the telson do not agree with 

 any other of the forms I have examined. The only characteristic which 

 at first seems difficult to conciliate with the features in my type spe- 

 cimen is: le premier article de celles (pates) des cinquieme et sixieme 

 paires troit et semblable a celui des pates precedentes, though if we 

 take into consideration the fact that MILNE EDWARDS did not try to 

 mark the distinction between two species of the 'present genus Xi- 

 phocephalus, but that between a Xiphocephalus and Qj-ycepha- 

 lus piscator t the seeming discrepancy will loose much of its impor- 

 tance. In comparison with the very broad, almost circular or pear- 

 shaped femora of the fifth and sixth pairs of perseopoda in Oxycepkalu* 

 piscator, the feebly dilated femora of the same pairs in Xiphocjepha- 

 lus armatus, must be considered as very narrow, but still we must 

 allow that they are somewhat broader than those of the third and fourth 

 pairs. 



In corroboration of my opinion as to the identity of Xipho- 

 cephalus armatus, H. MILNE EDWARDS, with the present species, comes 

 the fact that the specimens of Xiphocephalus marked Oxycephalm ar- 

 matus and Rhabdosoma armatum in the collection of the Musee d'Histoire 



