70 



CARL BOVALLIUS, AMPHIPODÄ HYPERIIDEA. I. 2. 



MIMONECTID^. 



3. MIMONECTES STEENSTRUPI, C. BOVALLIUS, 1885. 



Pl. VI, fig. 11—21. 



Diagn. Capvt quintam partem diametri sphserfe altitudine tequans. Articulus primus flagelli anten- 

 narum primi paris pedunculo paullo longior, crassus, non serratus. Segmenta omnia 

 pera'i sphaeram formantia. Metacarpi jyedimi jierwi primi et secundi parium cylindrati, 

 spinis instructi; non hirsuti. Pedes tertii paris octavam partem diametri sphter» longitudine 

 asquantes. Telson pedunculum pedum uri ultimi paris latitudine »quans, dimidio longi- 

 tudinis pedunculi paullo brevius, latitudinem autem longitudine valde superans. 



The head is as high as a fifth of the diameter of the globe. The first joint of the flagellum 

 of the first pair of antemm; is onlj- a little longer than the peduncle, thick, not serrated. 

 All the perceonal segments form the globe. The metacarpi of the first two pairs oi perceo- 

 poda are cylindrical, armed with spines, not hirsute. The third pair equal an eighth of 

 the diameter of the globe. The telson is as broad as the peduncle of the last pair of 

 uropoda; it is a little shorter than half the length of the peduncle, but much longer than 

 its breadth. 



Colour. Whitish, pellucid. 



Length. 7 to 11 mm. 



Diameter of the globe. 6 to 10 mm. 



Hab. The Northern temperate and the Arctic regions of the Atlantic (D. M.). The tropical region 

 of the Atlantic (P. M.; S. M.). 



;Syil. 1885. Mimonectes Steenstrupi, C. BOVALLIUS. — »Mimonectes, a remarkable genus 



of Amphipoda Hyperidea», p. 

 12, pl. 2, fig. 13 and 14. 

 Nova Aeta Soc. Reg. Scient. 

 Upsal. Ser. III. Vol. 13. 



» » » » 1887 . »Systematical list of the Amphi- 



j poda Hyperiidea.» Bih. t. K. 



Sv. Vet. Ak. Handl. Bd. 11. 

 N:o 16, p. 15. 



» » » » 1887. »Arctic and Antarctic Hyperids". 



Vega-Exp. Vetensk. Iakttagel- 

 ser. Bd. 4, p. 558, pl. 47, 

 fig. 111—115. 



» » » H. J. H.^NSEN. 1887. »Oversigt över det vestlige Gr0n- 



lands Fauna af malakostrake 

 Havkrebsdyr», p. 56. Vidensk. 

 Meddel. fra den Naturhist. 

 Förening i KJ0benhavn, 1887. 



Mimonectes Steenstrupi has the peculiar balloon-like form of the perseon more 

 highly developed than both the other species. When floating it resembles more a bladder 

 than an amphipod and it is very difficult to recognize it among the other pelagic animals 



