HISTORICAL NOTES. 3 



new species Oxycephalus oceanicus, which he himself later, 8, declared to 

 be synonymous with the typical species of H. MILNE EDWARDS. In 1839, 

 6, he gave a new drawing of it. 



In 1838 H. MILNE EDWARDS, 5, quoted the two species Oxycephalus 

 $>piscatoriw and 0. oceanicus; and in 1840, 7, he gave a drawing and a 

 fuller description of the type species, changing the name into Oxycepha- 

 lus pise a tor; at the same time he gave a diagnosis of a new species. 

 0. armatus, which is the first representative for the genus Rhabdosoma 

 or Xiphocephalus 



In the same year, or in 1841, EYDOUX and SOULEYET, 8, gave a 

 long description of Oxycephalus armatus, H. MILNE EDWARDS, accom- 

 panied by excellent drawings ; it is, however, not the true 0. armatus, but 

 identical with Rhabdosoma Whitei, established in 1862 by SPENCE BATE, 

 as will be proved below under this species. After the description of the 

 animal they say 1. c. p. 271 that F. E. GUERIN, who had aided them with 

 the examination, regarded the species generically distinct from Oxy- 

 cephalus, and established the genus Xyphocephalus for its reception. Thus 

 Xyphocephalus or Xiphocephalus is the eldest name for the genus and 

 must be accepted instead of the later names'. 



In 1848 ARTHUR ADAMS and ADAM WHITE, 9, instituted the genus 

 Rhabdosoma for the same Oxycephalus armatus, not knowing the just men- 

 tioned work; they gave a short generic diagnosis and said that Rhabdo- 

 soma armatum forms a singularly interesting link between the Amphipoda 

 and the Lasmodipoda, uniting, as it were, the two. They gave also a tolerably 



5. J. B. P. A. DE LAMARCK. Historie uaturelle des Aniinaux sans vertebres. 



2 me Edition par G. P. DESHAYES et H. MILNE EDWARDS. Tome 

 5 me , p. 308. Paris, 1838. 



6. F. E. GUERIN. Typhis. Dictionnaire pittoresque d'Historie naturelle et des 



phe*nomenes de la nature. Sous la direction de F. E. GUERIN. 

 Tome 9 me , p. 498, pi. 708, fig. 4 and 4 a, Paris, 1839. 



7. H. MILNE EDWARDS. Historie naturelle des Crustace's. Tome 3 me , p. 99 102, 



pi. 30, fig. 1012. Paris, 1840. 



8. EYDOUX et SOULEYET (and F. E. GUERIN). Voyage autour du monde execute' 



pendant les anne"es 1836 et 1837 sur la corvette la Bon it e. Zoo- 

 logie. Tome l er , p. 267271, pi. 4 fig. 1332. Paris, (1841?). 



9. ABTHUR ADAMS and ADAM WHITE. Crustacea. The Zoology of the voyage 



af H. M. S. Samarang, under the command of Captain Sir ED- 

 WARD BELCHER, p. 63, pi. 13, fig. 7. London, 1848. 



