1 Hyperia galba (Mont). 



(PI. 2; PL 3, fig. 1). 



Cancer gammarus galba, Montagu, Linn. Transact. XI, p. 4, pi. ->, fig. 2. 

 Syii : Hyperia Latreilli, M. Edw., 



Lestrigonus exulans, Kniyer cf, 

 Hyperia medusarum, Boeck. 



Body of female short and stout, with greatly dilated mesosomc. nf male 

 considerably more slender and having the metasome much larger than in 

 female. Eye-pigment very narrow reniform, reddish brown. < Jnathopoda 

 rather small and only sparingly bristle-beset, carpal joint in both pairs pm 

 duced, forming in the 2nd pair a narrow process reaching beyond tin- middle 

 of the propodal joint; the latter attenuated and finely serrated along the inner 

 edge; dactylns of both pairs rather slender and finely denticulated. Porein- 

 poda almost quite naked. Last pair of uropoda shorter than the urosome. 

 rather broad, especially in the male. Colour pale purplish yellow. Length 

 of female 14 mm, of male 12 mm. Maximum length of arctic specimens. 

 according to Bovallius, 20 mm. 



Remarks. - In spite of the opinion supported by Dr. Bovallius, I 

 cannot but believe Hyperia Latreilli of M. Edwards to be identical with H. 

 yaTba Mont. The said author, it is true, enumerates some minor diU'erenees 

 between the two ; but none of them can in my opinion be regarded as strictly 

 specific in character. It may moreover be observed, that the figures he gives 

 of H. Latreilli are from a not yet fully adult male, whereas those of //. tjdlln 

 are from a quite adult specimen. 



Occurrence. Rather common along the whole coast of Norway. 

 found parasitic on Anrdla, often several specimens, males, females and young 

 ones on each Medusa. 



Distribution. Atlantic coasts of France and Britain, the Cattegal 

 the Baltic, Arctic Ocean: Greenland, Spitsbergen, Novaja Semlja, Kara Sea 

 the Murman coast. 



2 Hyperia medusarum, (Mailer). 



(PI. 3, fig. 2). 



Cancer medusarum, O. Fr. Mailer, Zool. dan. prodromus, 2355, p. 14S. 

 Syn: Hyperia spinipes, Boeck. 



In general habitus very like the preceding species. Eye-pigmenl 

 however, somewhat larger and broader. Antennae very small in the ten, ale. 

 Gnathopoda considerably larger than in H. f,n7l>n and densely hirsute in their outei 

 part, carpal joint scarcely at all produced in the 1st pair, and hut very slightly 



