32 ]\Jr. A. 0. Walker — Notes on Amphipoda. 



in accordance with it (L c. p. 60, pi. ix. fig. 1), regardless of 

 Stimpson's statement, " Legs of the 5th pair [i. e. 3rd peraso- 

 pods] wanting the expansions of the basal joints." An exam- 

 ination of Bate's type specimens at the British Museum, kindly 

 made by Dr. W. T. Caiman, proves Stimpson to be right. 



(2) Prof. Delia Valle, in his description of S. valida, Dana, 

 in F. Fl. Neapel (Gammarini), p. 567, says that the Jifth and 

 sixth pairs of thoracic legs (third and fourth percecpods) have 

 the squama rather large, thus apparently confirming Dana. 

 But on being asked at my instance, by the good offices of 

 Dr. P. Mayer, if this was correct, he replied that it was a 

 lapsus calami, and ought to have been sixth and seventh pairs, 

 in proof of which he kindly sent me, through Dr. Mayer, 

 drawings of the three pairs of peraeopods, showing the second 

 joint of the third pair narrow as in the first and second. 



(3) In Rep. Ceylon Pearl Fisheries, vol. ii. p. 262, pi. iii. 

 fig. 19, I described Stenothoe gallensis, a species differing 

 from S. valida only in the absence of a distal tooth on the 

 palm of the second gnathopod in the female and a peculiarly 

 formed second joint in the ramus of the third uropod of the 

 adult male. Unfortunately in describing from a mounted 

 specimen of which the limbs were displaced, I mistook, and 

 consequently described and figured, the fourth perasopod for 

 the third. This was corrected in Trans. Linn. Soc, 2nd ser. 

 Zool. 1909, vol. xii. p. 331. The second joint of the third 

 perseopod is " linear " or narrow-oblong, as in the first and 

 second pairs. 



If the view be accepted that Dana was mistaken in his 

 description of the third perseopod, then to the list of synonyms 

 in the Amphipoda of ' Das Tierreich ' must be added Stenothoe 

 assimilis, Chevreux, Bull, de l'Inst. Oceanograph. Monaco, 

 1908, Mars. p. 4, figs. 4-6. 



I have examined specimens from the coast of Peru from 

 the U.S. Nat. Museum, Washington, which agree perfectly 

 with Dana's description except as regards the third peraeopods, 

 which are linear. 



Genus HEMUASSA, A. O. Walker, Nat. Antarct. Exped. 

 vol. iii. p. 38. 



Hemijassa ocius (Sp. Bate). 



Like Jassa, but uropod 3 not projecting beyond 1 and 2 

 and having the outer ramus without secondary teeth or curved 



spines. 



