REPORT ON THE AMPHIPODA. 



1585 



specimen a longer telson with a longer rostrum, but these parts are certainly variable 

 within the species. It would no doubt be possible to make out a case for distinguishing 

 the Pacific from the Atlantic specimens as different species, and on the other hand some- 

 thing might be said for grouping both sets under the name Oxycephalies tuberculatus, 

 Spence Bate, or the older and still more vague title, Oxycephalies piscatoris, Milne- 

 Edwards ; another species, Oxycephalies edwardsii, G. M. Thomson, 1884, makes a very 

 close approach to the forms which are here described, but there are some differences in 

 the gnathopods, the first joint of the fifth pergeopods is particularly slender, and the 

 double segment in the pleon is very decidedly longer than the telson in Mr. Thomson's 

 species. 



A plate with the signature " R. v. W. del" contains the two figures, of which 

 reduced copies are here given : — 



Fig. 29. 



The accompanying explanation is : — 



"Pig. 1. Thorax des <? . 

 A Kopf. 

 B Thorax. 

 C Abdomen, 

 c Herz. 

 coe Coecum. 

 i Darm. 



pg papilla genitalis. 

 Fig. 2. Hoden des <J ." 



It will be observed that the papilla genitalis of the female is placed in the seventh 

 segment of the perseon instead of in the fifth as might be expected, but this is probably 

 an error. The figures do not suffice to determine what species of Oxycephalus was 

 under examination ; apart from their scientific value, they have a special interest as 

 being the work of the young and ardent naturalist who closed his life on board the 

 Challenger, during the voyage to which he had looked forward with so much eager 

 enthusiasm. 



(ZOOL. CHALL. EXP.— PAKT LXVII. 1888.) 



Xxx 199 



