126 Carl Bovallius, The Oxycephalids. 



Syn. 1841. Oxycephalus armatus, [H. Milne Edwards]. Eydoux and 



» SOULEYET. 8, p. 267, pl. 



4, fig. 13-32. 

 Bhabdosoma ai'iuatum, » C Claus. 1S71. 23, p. 155. 



» » » » 1879. 27, p. 197 (51). 



» » » » 1887. 36, p. 74, pl. 



25, fig. 1-6, 



pl. 26, fig. 5. 



» Th. Stebbing. 1888. 39, p. 1607. 



1862, Rhabdosoma Whitei, ') Spence Bate. 20, p. 345, pl. 



» » » Th. Streets. 1878. 26, p. 287, pl. 



2, fig. 6. 

 Rhabdonectes » » C. Bovallius. 1SS7. 35, p. 39. 



1887. Rhabdosoma investigatoris, G. M. Giles. » 37,p. 219,pl.4. 



The original description of Spence Bate in 1862 was fully suf- 

 ficient for the identification of his species. I give here the most im- 

 portant passages of it. 



» Sixth segment of the pleon (= the last coalesced ural seg- 

 ment) not longer than the preceding. • First pair of gnathopoda 



having the coxa (= the epimeral) anteriorly produced to an obtuse point; 

 carpus broadly infero-anteriorly produced as far as the inferior angle 

 of the propodos; propodos short, stout, inferior angle anteriorly pro- 

 duced; dact3dos long, arcuate, capable of antagonizing at the apex with 

 the extremity of the carpus only. Second pair of gnathopoda much 

 longer than the first; carpus infero-anteriorl}^ produced beyond the ex- 

 tremity of the propodos, the process being slender and curved, terminat- 

 ing in a fine point; propodos increasing towards the distal extremity, 

 inferior angle slightly anteriorly produced; dactylos arcuate, antagonizing 

 at the extremity with the apex of the carpus. Pereiopoda gradually in- 

 creasing in length posteriorly, the fourth pair being the longest; fifth 

 obsolete. Antepenultimate pair of pleopoda reaching to half the length 

 of the ultimate; peduncle having the outer margin coarsely, the inner 

 finely serrated; penultimate pair originating ou the inner side of the 

 preceding, and longer than the sixth segment of the pleon (= the last 

 coalesced ural segment); peduncle having the outer margin coarsely, the 

 inner finely serrated ; ultimate pair nearly as long again as the sixth 



1) Spence Bate, in his pubiicatiou of 1861 (19, p. 15, pl. 1, fig. 4) gave 

 a drawing f)f the animal, and mentioued the name Rhabdosoma Whitei., but only in 

 the explanation of the plates, and without the slightest description. 



