HYPERIA. 
205 
ing ploughed up, so to speak, rather than burrowed into. 
Upon the whole, Chelura would seem to be a still more 
destructive creature than even Limnoria ” 
Tribe HYPERITA. 
Head very large. Mandibles large, generally ending in 
crests rather than teeth. First pair of jaw, of three joints, 
the two last lamellar, the thorax of six or seven joints ; some 
of the legs prehensile and of curious form ; end of abdomen 
adapted for swimming but not for leaping. 
The species of this tribe are more or less parasitic, some 
of them being attached to Fishes, and others to Medusae. 
Fam. PHRONIMABM 
Second pair of antennae styliforfn, and not capable of 
being folded on themselves. Body swollen, head very 
large ; some of the true legs prehensile. 
Gen. 100. HYPERIA. 
Body wider than high, swollen above, blunt in front, 
swollen towards the middle, and considerably narrowed be- 
hind. Head very large, the eyes occupying its greater part. 
