446 



year 1830 as Ampliitlioe Jurinii. and was subsequently described and figured 

 in his well-known work on the Crustacea. The Ampliitlio'v norveyica of Rathke 

 is undoubtedly identical with M-Edwards' species, and this is also the case 

 with the form described by Sp. Bate in his Catalogue of Amphipoda in the 

 British Museum as Plnrn*</ fiicicola Leach 1 ); but the Amphipod he sub- 

 sequently describes and figures under the same name in his work on the 

 British sessile-eyed Crustacea, from the type specimen of Leach, is evidently 

 an entirely different form. Mr. Walker has first called attention to this fact 

 and has shown, that the Plierusa fucicola of Leach is indeed nothing else than 

 the female of Gammarella brevicaudata, M. Edw., a form which does not even 

 belong to the same family. Under such circumstances, the Leachian species 

 must be cancelled altogether, and even his genus Plieriisa discarded from the 

 Zoology, as founded on a misapprehension. It is on these suggestions that 

 Mr. Walker has restored the specific name proposed by M-Edwards and 

 changed the generic name Phentsa to Aplierusa. I quite agree with that 

 author, that this species cannot properly be referred to the genus Calliopius, 

 as proposed by Boeck, differing, as it does, very markedly both in the 

 structure of the antennae, and in that of the gnathopoda. On a closer 

 anatomical examination of the animal, I have not found any essential 

 characteristics whatever, to warrant its generic separation from the 4 species 

 described in the preceding pages, and the genus Aplicrusa has therefore been 

 extended to include also these forms. From the latter the present species is 

 at once distinguished by. the absolute want of any dorsal projections. 



Occurrence. I have only met with this form in a single locality 



off the Jsederen coast, where it occurred not rarely in quite shallow water 

 among algse. Rathke collected it at Christiansund, and Boeck records it 

 also from Haugesund. 



Dixfrilnfion. British Isles (Sp. Bate), Kattegat (Meinert), coast of 

 France (Chevreux), Mediterranean (Chevreux). 



Gen. 4. Calliopius, Lilljeb. 18(35. 

 Syn.: Calliope, Sp. Bate. 



Body comparatively strongly built, with none of the segments produced 

 dorsally. Cephalon with a rather small rostral projection, and having the 

 postantennal corners scarcely at all produced. Coxal plates of moderate size, 



') As pointed out by Mr. Walker, the figure referring to this form is not fig. 9, as stated 

 I 'Oil i in the text and the plate, hut fig. 10. 



