HYPERTNA. 



This division is synonymous with Milne Edwards's 

 family of HYPERINES, and also with Dana's family of 

 HYPERIDEA. It contains four families, two only of 

 which have representatives in our British Fauna, namely, 

 HYPERIID^E and PHRONIMID.E. 



Earn. I. HYPERIID^E. 



The head is large and globular, being nearly occupied 

 by the eyes. The superior antennae consist of a three- 

 jointed peduncle and a flagellum, variable in length, but 

 of which the first articulus is very long. The inferior 

 antennae are formed of a peduncle and a variable flagel- 

 lum. The first two pairs of legs are simple, but have 

 the wrists more or less infero -anteriorly produced ; the 

 other legs are generally subequal in size. The three 

 anterior pairs of swimming legs resemble those of 

 Gammarus, but the three posterior are broad, flat, and 

 biramose ; the rami being lanceolate, and frequently 

 serrated, but destitute of any ciliary fringe. 



The species are oceanic in their habits, and found to 

 exist only in the gill cavities of the medusae. 



