402 M. A. Boeck on the Arrvphipoda 



on our coasts, where it was found by me at Farsund, and by 

 Sars at Bergen. 



Leucothoe, Leach. — This genus requires to have its bounda- 

 ries enlarged for two species added by Kroyer. Lilljeborg 

 pointed out that Kroyer' s species, together with one discovered 

 by himself, ought to form a new genus, but did not establish 

 it. Bruzelius followed him in this opinion, but still referred 

 these three species to the above genus. As many species of 

 different forms have now been found, it will be advisable to se- 

 parate them. I have found a species belonging to the original 

 genus at Farsund, in the branchial cavity oiAscidia ; it has also 

 been found under the same circumstances at Manger, by Sars. 

 This species differs in many respects from that described by 

 Lilljeborg, which he believes to be Montagu's Gammarus 

 articulosus ; but I believe that the species found by me must 

 rather be regarded as the latter, as it is both larger and of 

 more frequent occurrence than Lilljeborg's species, for which 

 I will propose the specific name Lilljeborgii, after its dis- 

 coverer. 



L. articulosa, Mont., is about 14 millims. in length, and 

 differs from LiUjeborgii, which in other respects it closely re- 

 sembles, in the following particulars : — The process of the 

 fourth joint in the first pair of legs is not toothed at the mar- 

 gins ; the fourth epimera are not armed with any tooth ; the 

 inferior hinder angle of the third abdominal segment is straight 

 and forms no tooth ; the branches of the fifth pair of abdo- 

 minal legs are of unequal length, the inner one longer than 

 the outer. The telson is very long, narrow, and lanceolate, 

 pointed at the apex, and not rounded off. This species is 

 evidently the same that Abildgaard described in the ' Zoologia 

 Danica ' and figured on pi. cxix. under the name of Gammarus 

 spinicarpus. 



The genus Leucothoe is the type of Dana's subfamily Leu- 

 cothoinge, in which he indicates especially the elongated palpi 

 of the maxillipedes with the short masticatory plates, and the 

 absence of masticatory tubercles on the mandibles ; but the first 

 character occurs, although not in the same degree, also in species 

 of Bruzelius's genus Paramphitoe, such as P. panopla and P. 

 pulchella, Kr., whilst masticatory tubercles occur in many forms 

 which show a near generic relationship to Leucothoe. In all 

 the forms belonging to the Leucothoinas the legs are certainly 

 long and slender, and the first two pairs of hands of a peculiar 

 form ; but nevertheless that subfamily cannot be sharply 

 denned. 



Stenothoe, Dana. — Costa's genus Probolium may certainly 

 merge in Dana's Stenothoe ; and it now contains, besides the 



