2 Carl Bovallius, 



MIMONECTIDJ]. 



Hyperids with the head and a part or the whole of the pereion 

 developed into an enormous balloon-shaped globe. Ocelli not united but 

 dispersed on each side of the head. The upper antennge long, more. or 

 less straight. The lower small, four-jointed. The mandibles without 

 palp. The maxillipeds well developed. 



Mimonectes, n. g. 



Derivatio, Mlfioç: mimic, imitator, and vïJxttjç: swimmer. 



Diagn. Caput maguiun, latum, valde inflatum, simiü ciini pereio sphseram formans. 

 Oculi parvi, dispersi. 



AntenncB superlores longas, rectse, flageUo articulato. 

 Antennes inferiores parvse. 

 Pleon compressum non inflatum. 

 Pedes uri duos ramos gereutes. 



The head and the pereion are inflated, forming together an enor- 

 mous globe. 



The eyes are small, scattered over the sides of the head. 



The upper antennce are long, straight, with articulated flagellum. 



The loioer antennce are small. 



The pleo7i is compressed, not inflated. 



The uropoda are provided with two rami. 



The genus Mimonectes is easily distinguished from other Hype- 

 rids by its globular shape, with all the legs, branchial sacks, ovigerous 

 lamellae and the urus hanging down, similar to the filaments of a me- 

 dusa. But it differs also by some anatomical and morphological charac- 

 teristics from all or most of the other Hyperids. As important points 

 I mention the structure of the eyes and of the nervous system, and that 

 the interior of the pereion forms a bladder containing a fluid. 



With the genus Lanceola, Say*) it agrees in the strong deve- 

 lopment of the maxillipeds, with Cysteosoma, Guéein and Tyro, Milne- 

 Edwards ^) in the form of the upper antennge, with the true Hyperiae 

 in the shape of the urus and its appendages. 



1) See: Carl Bovallius, On some forgotten genera of the Amphipodous Crustacea. 

 Bihang t. K. Vet.-Akad:s Handl. Tom. 10. N:o 14, pag. 3. Sthm 1885. 



2) See Carl Bovallius 1. c. pag. 12. 



