1610 



THE VOYAGE OF H.M.S. CHALLENGER. 



either for his Rhabdosoma ivhitei or his Rhabdosoma armatum. Dr. Giles says of the 

 first and second gnathopods of his species that, unlike those of the forms described 

 by Spence Bate, Streets, and Claus, they "are subequal and very closely resemble each 

 other." When these small appendages are observed with a low power, such a statement 

 would be readily applied to them, and in describing the type-specimen Milne-Edwards 

 is content to say, " pates des deux premieres paires extremement petites," without the 

 slightest distinction between them, yet in all probabdity all the forms have the first 

 gnathopods easily distinguishable from the second when highly magnified. The com- 

 parative lengths of the segments, the uropods, and the telson would seem to be highly 

 variable according to the age or sex, but other characters when more completely 

 examined than they have hitherto been may suffice for establishing specific distinction 

 between some of the forms included in the synonymy here discussed. 



Rhabdosoma armatum (Mdne-Edwards). Specimens B, C. 



Fig. 32. 



The woodcuts here given are reproduced on a reduced scale from a plate drawn by 

 the late B. v. Wdlemoes Suhm during the voyage, and accompanied by the following- 

 explanation in his handwriting; : — 



