XlPHOCEPHALUS. 117 



our specimen we cannot describe this, but indicate it on the plate from 

 a drawing made at the time of capture. The immense length of the 

 body and the beak would sufficiently mark this generic form)). 



On the same typical specimen on which ADAMS and WHITE had 

 founded the genus Rhabdosoma, SPENCE BATE in 1858 founded his genus 

 Macrocephalus. Four years later he himself dropped the new name in 

 favour of Rhabdosoma. 



In 1840 H. MILNE EDWARDS (7, p. 101) described Oxycephalus ar- 

 matus with characteristics fully sufficient for the identification of the spe- 

 cies. The OxycephaliLs armatus, which was described at length by EYDOUX 

 and SOULEYET (8, p. 267 71) is not identical with MILNE EDWARDS' species, 

 but with that subsequently instituted by SPENCE BATE (see below p. 127). 



The Rhabdosoma armatum, ADAMS and WHITE, is a true Xipho cep ha- 

 lus armatus, as is of course also Macrocephalus longirostris, SPENCE BATE, 

 the two names really having been given to the same specimen. 



The Rhabdosoma Whitei, SPENCE BATE, is a good species, and the 

 characteristics given by its founder, are quite adequate. 



The Rhabdosoma armatum and Rh. Whitei, recorded in 1878 by 

 STREETS, are the true species, but his Eh. longirostre is based only on 

 the bad drawing of SPENCE BATE from ADAMS and WHITE'S typical spe- 

 cimen of Xiphocephalus armatus (see below p. 121). 



The Rhabdosoma armatum, described by GLAUS in 1879 and 1887, 

 is a mixture of the two species just metioned, the male being Xipho- 

 cephalus Whitei, and the female X. armatus. 



The Rhabdosoma Batei, figured in 1884 by J. S. KINGSLEY (32, 

 fig. 98), is a synonym for Xiphocephalus armatus. 



The Rhabdosoma investigatoris, proposed in 1887 by G. M. GILES 

 (37, p. 219), is identical with Xiphocephalus Whitei (see below p. 127). 



The Rhabdosoma armatum, recorded in 1888 by STEBBING, is a 

 Xiphocephalus Whitei. His new species, Rh. brevicaudatum, seems 

 to be a good species. 



Here I propose a new species Xiphocephalus Lilljeborgi. 



