144 Canon A. M. Norman on British Amphipoda. 



Hah. Oban ; Falmouth, in great abundance on dead fish 

 in a crab-pot {A. M. N.) ; Banff ( T. Edward) ; Clyde {D. R.) ; 

 Menai Strait {A. 0. W.) ; Ardbear Bay Ireland {G. S. 

 Dradij) : Mus. Nor. Isle of Man and Valentia Harbnir, 

 Ireland {A. 0. W.). 



Distrib. West coast of France {Chevreux and Bonnier). 



Genus 6. Ambasia, Boeck. 



24. Ambasia Danielsseni, Boeck. 



? 1861. Lysianassa atlanfAcn, Bate k Westwood, (1) vol. i. p. 82. 

 1870. Ambasia Danielssenii, A. Boeck, (137) p. 17. 

 1872. Ambasia Danielsseni, A. Boeck, (138) p. 121, pi. iii. fig. 6. 

 1890. Ambasia Danielsseni, G. O. Sars, (142) p. 46, pi. xvii. fig. 1. 

 1898. Ambasia Danielsseni, Walker, " Malacostraca from the West of 

 Ireland," Trans. Liverpool Biol. Soc. vol. xii. p. 16(3. 



llab. Mr. "Walker, in the last-mentioned paper, records 

 Ambasia as taken off the south-west of Ireland in 750 fathoms. 

 The specimen is preserved in the Dublin Museum of the 

 Royal Irish Academy. 



Distrib. Trondhjem Fiord, Norway, in 100-300 fathoms 

 {A. M. N.) ; West Norway {G. 'O. Sars): Mus. Nor. 

 Though rare, found by Sars in several places on the south 

 and west coasts of Norway and as far north as Hammerfest 

 in Finmark. 



It is not improbable that i\\e. Lysianassa ailantica, Bate and 

 Westwood, may be the male of Ambasia Danielsseni, the 

 greater length of the filaments of the antennse being a cha- 

 racter distinctive of the male sex. The remarkable character 

 of the first joint of the antennules, the form of the head, the 

 structure of the gnathopods, all closely agree with Ambasia. 

 It is true that the telson is described as " squamous and 

 simple ; " but Mr. Walker *, who has carefully examined the 

 type in the British Museum, says that it is not so, but " cleft 

 to the base, without lateral spines, but with a terminal spine 

 in a deep notch in each division." If we read "deeply cleft" 

 instead of " cleft to the base " we have in Mr. Walker's words 

 an accurate description of the telson of Ambasia', and to 

 complete the identity we learn further from Mr. Walker that 

 " the third pleon-segment has the hinder angle acute and 

 shortly recurved, but without a sinus." 



* Mr. Walker has done excellent service in the examination of Spence 

 Bate's specimens. His two papers on the subject are : — 



1. "The Lysiauassides of the 'British Sessile-eyed Crustacea,' Bate 

 and Westwood," Ann. & Mag. Nat. Hist. ser. 6, vol. ix. p. 134. 



2. " The Amphipoda of Bate and Westwood's ' British Sessile-eyed 

 Crustacea,' " Ann. & Mag. Nat. Hist. ser. G, vol. xv. p. 464. 



