^{56 THE IlEV. T. U. 11. STEBIIIXG OX 



quite half as long as the wrist. The perajopods are distinguished 

 chiefly by the strong denticulation of the hind margin in the 

 second joint of the fifth pair; in this and the two precedino- 

 j)airs the terminal joints ai-e not so long and .slender as in 

 T. longlpcf. ; the fourth joint is rather narrower in the fifth pair 

 than in the two preceding pairs. The branchial vesicles show 

 various proximal folds. 



The telson is divided nearly to the ba,se, each division having 

 three submarginal spines, and tliree apical, of which tlie central 

 is the longest, with a setule between it and the very small outer 

 spine. 



Length of male 9 mm. A second specimen, with flagellum of 

 second antenn;e broken, the remainder of seven joints carr3'ing no 

 calceoli and suggestive of a short termination, is probably the 

 female. It measures 6 mm., and like the male is very narrow, 

 with the curved process of the epistome conspicuous, 



Locallt}/. Roy Cove, from the depth of 8 fathoms. Specimens 

 from Whales Bay, observed after the above description was 

 written, show the second antennje a little longer than the fii-st. 



The species is named in honour of my fi-iend, M. Edouard 

 Chevreux, a brilliant student of the Amphipoda. 



Gen. AcoxTiosTOMA Stebbing. 



1SS8. Acontiostoma Stebbing, Hep. Vo}'. 'Challenger,' vol. xxix. 



p. 709". 

 19()G. „ Stebbing, Das Tierreich, vol. xxi. pp. 9, 15. 



AC'OXTIOSTOMA MARIOXIS Stebbing. 



1888. Acontiostoma marlnnls Stebbing, Rep. Voy. ' Challenger,' 



vol. xxix, p. 709, pi. 'M). 

 1898. „ ,, DellaValle, F. ckFl. NeapeI,vol. XX, 



p. 786. 

 1906. ,, ,, Stebbing, Das Tierreich, vol, xxi. 



p. 15, text-fig. 4. 

 1912. „ „ Chilton,Tr.R.Soe.E>linb. vol.xlviii. 



p, 462, 

 Mr. Vallentin obtained a specimen from roots of Jlacroct/stis 

 on Jan. 14, 1902, and another, 7 mm. long, much more recently 

 at Ripid Point, low water of spring tide. The finding of these 

 specimens in the Falkland Islands increases the probability, with 

 wliich Pi'ofessor Delia A^alle naturally agrees, that my Acontio- 

 stoma mayellanicus is merely a young form of A. murionis. 



Fam . A M r E L I s c I D ,i:, 



1882. Ampeliscidce Sars, Forh, Selsk. Christian, no. 18, p. 29. 

 1906. ,, Stebbing, Das Tierreich, vol, xxi, pp. 6, 



97, 721, 

 [16] 



