occurring on the Norwegian Coasts. 403 



typical species, S. volidus and S. iwlyprion^ Costa, a new 

 iSorweg-ian species which I have called 



8. Danai, milii. — I found a female of this species at Farsund, 

 at a de])th of 15 fathoms. It is not quite 5 millims. in length, 

 and differs from the two other species in the form of the first 

 two j)airs of hands, of the fourtli ejjimera, and of the abdomen. 

 The third joint of the first pair of legs has its inferior ])osterior 

 angle much elongated into a thick process, which is as long as 

 the following joint. The hands are shorter than the preceding 

 joint ; the fifth joint or hand of the second pair of feet is ex- 

 tremely large and oval, and its posterior margin furnished 

 A^-itll many blunt teeth and with two long spines, which reach 

 the apex of the finger. The fourth epimera are much longer 

 than broad, and become naiTower behind, but not cmarginate 

 for the fifth, as in S. validus. The outer branch of the fifth 

 pair of abdominal legs is much shorter than the inner one, 

 and the peduncle of the last pair of abdominal feet is much 

 longer than in S, validus. 



Eusinis, Kr. — Dana thought that this genus of Kriiyer's 

 differed so little from Gammariis, that it must be merged in 

 it. Bruzelius certainly accepted it as a genus, but thought 

 that it stood very near to Gammarus. I think, however, that 

 these genera have few characters in common, except the se- 

 condary flagellum, and this is very small. At the first glance 

 there appears to be a great agreement between this genus and 

 Leucothoe. In both the third joint of the peduncle of the su- 

 ])erior antenna is small, and the first two pairs of hands are 

 nearly of the same form. Both have the following pair of 

 legs long, slender, and feeble, whilst in Gammarus they arc 

 strong ; and, finally, the very long abdominal feet and telson, 

 as also the large first epimera, are very characteristic external 

 peculiarities of the two genera. Similar agreements occur in 

 the more concealed parts. The mandibles certainly differ, in- 

 asmuch as in Eusirus they possess a masticatory tubercle ; 

 but the first pair of maxillary ]ial])i have the same form in 

 both, and are divided into two nearly er]ual large joints. The 

 inner lamella is furnished only with a single hair, contrary to 

 what occurs in Gammarus. The masticatory lamella^ of the 

 maxillipedes are small, and the palpi much elongated, but 

 rather strong. To this genus a new s])ecies may be added, 

 belonging to our fauna : — 



E. Io)igij)es, mihi. — The third joint of the superior antenna? 

 is longer than in E. cusjn'ihifus ; and the riagollum consists in 

 the males of fifty-four joints furnished with sucking-disks, 

 and in the females of forty-two. The fifth j(»int of the in- 

 ferior antenna? is shorter than the fourth ; in the females it is 



31* 



