occurring on the Norwegian Coasts. 407 



tiania. The eyes are nearly round ; the superior antennas are 

 longer than the inferior ; the peduncle short, with its first joint 

 the longest ; the flagellum consists of twenty-three joints ; the 

 first joint of the inferior antennas is extremely large, standing 

 out nearly in a spherical form ; the second joint is very short 

 and united Avith the preceding one ; the fourth and fifth are of 

 nearly equal length ; the flagellum consists of twelve joints; 

 the fifth joint or hand of the first pair of legs is oval, that of 

 the second pair much elongated and narrower ; the last three 

 segments of the abdomen are furnished with small spines. 

 The first segment has two small spines upon each side of the 

 median line ; the next has a strong spine in the median line, 

 and a longer and thinner one on each side ; the last segment 

 has a small spine on each side. The branches of the telson 

 are furnished with three spines at the apex. 



Amphithopsis } mihi. — Milne-Edwards placed in the genus 

 Amphithoe those species which had the appearance of the 

 genus Gammarus, but wanted the secondary flagellum on the 

 superior antennas. Dana correctly separated the true species 

 of Amphithoe from the rest, which he placed under the name 

 of Iphimedia, H. R. ; but this selection of a name was less 

 fortunate, as /. obesa is a form differing from them. Spence 

 Bate referred the genus Amphithoe to its right place in the 

 family Corophiidae, which opinion has also been adopted by 

 Bruzelius. To the Scandinavian species which ought to come 

 under Dana's genus Iphimedia Bruzelius has given the generic 

 name of Paramphithoe ; and in this genus he prices all the 

 species which have the body more or less compressed and 

 furnished with large or middle-sized epimera — in which the 

 superior antennas are small, destitute of secondary flagellum, 

 and have the third joint of the peduncle smaller than the fla- 

 gellum — in which the eyes are compound, the mandibular 

 palpi three-jointed, and those of the maxillipedes four-jointed — 

 in which the fifth joint of the first two pairs of legs is converted 

 into a prehensile hand — in which the seventh pair of feet are 

 not twice as long as the preceding — and in which the last pair 

 of abdominal legs are two-branched, — that is to say, all the 

 species of the family Gammaridas which do not belong to the 

 genera Ampelisca, Leucothoe, D ] examine , Acanthonotus } (Edi- 

 cerus, &c. It consequently includes a very large number of 

 species. But if these be more closely examined, we shall easily 

 find that they differ very much among themselves in form, 

 and consequently cannot belong to the same genus. Some of 

 them are stout, keeled, angled, and have the body often armed 

 with spines and furnished with a large pointed rostrum. The 

 inner lamellae of the maxillipedes are small, and their paJpi 



