ggQ CRUSTACEA. 



Family I. HYPERID.E. 



The Hyperidse pertain to three subfamilies : — one having the body 

 Gammaroid in form, and the maxillipeds with a short palpus; in the 

 others, the maxillipeds are wholly without a palpus ; one has the body 

 stout and tumid, and the mandibular palpus slender; another has the 

 body more slender or narrow, and the mandibular palpus very broad 

 and short. In the two former, the masses of pigments in the head are 

 two or four in number; in the last, as far as observed, there is but 



a single mass. 



The species in this family differ widely in the development of the 

 antennae, the superior pair being sometimes obsolescent, and often 

 both pairs short, while sometimes each has a long slender flagellum 

 exceeding the body in length. Species having a long flagellum when 

 adults, are sometimes wholly destitute of the flagellum before reaching 



maturity. 



These subfamilies and their genera may be distinguished as fol- 

 lows : — 



Subfam. 1. VIBILIN^E. — Corpus forma paulo Gammaroideum. 

 Caput oculique mediocres. Maxillipedes palpo parvulo instructi. 

 Palpus mandibularis tenuis. 



Q. 1. Vibilia, Edw.— Antennae quatuor breves, lmae obtusae. Pedes lmi 2dique 

 subprehensiles. 



Subfam. 2. HYPERIN^. — Caput tumidum. Oculi pergrandes. 

 Palpus mandibularis tenuis. 



1. Antennas sive lmae sive 2dce flagello longo confectce. 



G. 1. Lestrigontjs, Edw.— Antennse lmae 2daeque flagello longo confectaa. Pedes 



lmi 2dique paulo prehensiles. 

 a. 2. Tyro, Edw.— Antennae lime flagello longo confectae j 2dae perbreves, flagello 



nullo. 



2. Antennae totce breves. Caput oculique pergrandes. 

 Gt. 3. Hyperia, Latr. — Antennas lmae 2daeque conspicuae, 2dis gracilionbus. 



