KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 61 



Colour. Yellowish, pellucid. 



Length. 18 to 28 mm. 



Diameter of the globe. 10 to 17 mm. 



Hab. The Northern temperate and the tropical regions of the Atlantic (D. M.; F. M.; S. M.). 



Syil. 1885. Mimonectes Loveui, C. BOVALLIUS. »Mimonectes, a remarkable genus of Amphipoda 



Hyperidea», p. 3, pi. I, II, fig. 15 — 20 and 

 pi. III. Nova Acta Soc. Reg. Scient. Upsal. 

 Ser. III. Vol. 13. 

 » » » 1887. "Systematical list of the Amphipoda Hyperiidea». 



Bih. t. K. Sv. Vet. Ak. Handl. Bd. 11. N:o 16, 

 p. 15. 



For some details of the anatomical structure I refer to the above cited paper »Mi- 

 raonectes», containing the original description, and to the morphological part of this 

 treatise. 



The globe or ballon-shaped portion of the body is built up of the head and the 

 first five peraeonal segments in connection, the top of the globe is formed exclusively by 

 the second peraeonal segment. The last of the inflated segments, or the sixth, does not 

 reach as high up as does the head. The inflated globular portion of the body seems to be 

 not only a mimicking disguise but also a mighty organ for the floating power of the animal. 



The integument of the body is pellucid, very thin. Some parts of the hypodermis 

 as that of the head, the lower part of the first peraeonal segment and the epimerals are 

 easily seen to consist of large hexagonal and pentagonal plates. 



The head is very broad and high owing to its participation in the inflated sphaeri- 

 cal portion of the body or the »globe» as it may be called here for shortness' sake. The 

 head is more broad than high, and about four times as high as long. 



The ocelli do not form a faceted eye on each side of the head as in most of the 

 Hyperjds, but are separated, about ten on each side, scattered, apparently without order, 

 over a small area above and between the bases of the first pair of antennae. 



The first pair of antennce (PL V, fig. 3 and 4) are fixed just at the lowest part 

 of the front side of the head. The peduncle is two-jointed, the first joint is thick and 

 stout, more than four times as long as the second. The first joint of the flagellum is 

 thick and broad at the base, evenly tapering toward apex, which has the inner upper 

 corner produced into a sharp, bi-denticulated process, overlapping the half of the second 

 flagellar joint. Both the upper and the under margins of the first flagellar joint are 

 strongly serrated; along the inner side it carries a row of long »olfactory» bristles, fixed 

 on small, round desks. The second and third flagellar joints have the upper anterior 

 corners produced into double-pointed processes, similar to that in the first joint, they carry 

 some stout bristles on the upper margin, the under margin is smooth. The fourth fla- 

 gellar joint is feebly bent upwards, almost as long as the two preceding joints together, the 

 margins are smooth, the apex shows two small teeth. In the first joint of the flagellum there 



