1 Hyperia galba (Mont) 



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

 Cancer yiiDDiinnis galbri, Montagu, Linn. Transact. XI, p. 4, jil. 2, iig. 2. 

 Syn : Hy2icria Latreilli, M. EJw., 

 « Lestrigonus exulans, Kroyer = (j", 

 « Hyperia mcdusarum, Boeck. 



Body of female short and stont, with greatly dilated mesosome, of male 

 considerably more slender and having the metasome mnch larger than in 

 female. Eye-jngment very narrow reniforra, reddish In-own. Gnathopoda 

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

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

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

 edge; dactylus of both pairs rather slender and finely denticulated. Pereio- 

 poda almost quite naked. Last pair of nropoda shoi'tei' 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. 



ReninrJcs. — In spite of the opinion supported by Dr. Bovallius, I 

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

 galba Mont. The said author, it is true, enumerates some minor differences 

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

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

 of H. LofycilU are from a not yet fully adixlt male, whereas those of H. f/aJha 

 are from a (piite adult specimen. 



Occurrence. — Rather common along the whole coast of Norway, 

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

 ones on each Medusa. 



Disfrihiifion. — Atlantic coasts of France and Britain, the Cattegat, 

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

 the Murman coast. 



2. Hyperia medusarum, (Mtiller). 



(PI. 3, fig. 2). 



Cancer medunarnm, O. Fr. Miillev, Zool. dan. prodromus, 2365, p. 148. 



Syn : Hyperia spinijies, Boeck. 



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

 however, somewhat larger and In'oader. Antennae very small in the female. 

 < fnathopoda considerably larger than in H. (jalha and densely hirsute in tlieir outer 

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



