180 PROFESSOR CHARLES CH1LTON ON THE 



NORTHERN AND TROPICAL ATLANTIC. 



NAME OF SPECIES. DISTRIBUTION AND REMARKS. 



1. Synopia srheeleana Bovallius. Pacific and Atlantic Oceans. 



2. Hi/ale grimaldii Chevreux. North Atlantic. 



3. Allorchestes ptumicornis (Heller). Mediterranean and North Atlantic. 



4. Sunamphitoe pelagica (Milne Edwards). North Atlantic. 



5. Anchylomera Mossenlfii Milne Edwards. Tropical Atlantic. 



6. Oxi/cephnlus clausi Bovallius. Tropical Atlantic and (?) Pacific. 



III. ANTARCTIC AND SUB-ANTARCTIC SPECIES. 



Genus ACONTIOSTOMA Stebbing, 1888. 



Acontiostoma marionis Stebbing. 



1. Acontiostoma marionis Stebbing, 1888, p. 709, pi. xxx.* 



1906, p. 15, fig. 4. 



magellanicum Stebbing, 1888, p. 714, pi. xxxi. 



1906, p. 15. 



Station 461, Gough Island; 100 fathoms. 23rd April 1904. One specimen, 

 7 mm. long, 5 mm. high. 



This specimen agrees well with the description and figures given by STEBBING. As 

 1 have only the single specimen, I have not dissected it, but the maxillipeds can be seen 

 to agree with his description, while the shape of the third uropod and of the telson with 

 its fringe of stout spines leaves no doubt as to the identity of the species. 



A. magellanicum Stebbing is, as Mr STEBBING has pointed out, almost certainly the 

 young of this species, which is now therefore known from Marion Island, Gough Island, 

 and Straits of Magellan. 



Among the Amphipoda that I brought with me from New Zealand for examination 

 [ have a slide from Mr G. M. THOMSON'S collection that undoubtedly belongs to this 

 genus, and is, I think, not specifically distinct from A. marionis. It has the upper 

 antennae and the first gnathopod rather stouter than is shown in Mr STEBBING'S 

 figure ; but the peculiar second gnathopod, with the finger sunk in a little cavity at the 

 end of the propod, and the uropoda and telson, agree very closely with the Challenger 

 specimen. In some points it approaches rather nearer to A. magellanicum, and tends 

 to confirm the view that that species is only the young of A. marionis. 



This slide was mounted by Mr THOMSON from one of a very small number of 

 specimens collected in Lyttelton Harbour by myself about the year 1884, and handed to 

 him in 1895 when I left New Zealand for a lengthy period. When living, the animals, 

 which were all of very small size, were bright red in colour. I had dissected and 

 mounted a slide of one of the other specimens about that date, and I have a drawing 



* The references are made by the year of publication to the works given in the Bibliography on pp. 235-237. 

 1 have given only those references that appeared to be necessary for the purpose of the present paper. 



(ROY. aoc. EDIN. TRANS., VOL. XLVIII., 462.) 



