654* MR. E. J. MIERS OK THE 



not always harmonize with the characters derived from the struc- 

 ture of the orbits and antennae. 



§ nostrum vertically compressed and laminated, hijid, ornotched at 

 the extremity. Orbits sJialloio and very open above, so that the 

 eyes, when retracted, are more or less visible from above, the eyes 

 themselves short and thicTc. 



* Ambulatory legs extremely long and slender. 



EaEEiA, Latr. {Leptopus, Lamk., pt.). Carapace broadly tri- 

 angular, spinose. Kostrum prominent, notched. Orbits with 

 two wide fissures below. Basal antennal joint rather narrow. 

 Anterior legs of male rather small. Type Ugeria longipes (Herbst). 



Choeilibinia, LocTcington. Carapace triangular. Eostrum 

 long, the spines coalescent at base and divergent at tip. Basal 

 antennal joint moderately enlarged. Upper orbital margin very 

 prominent. Eye-peduncles short. Type Chorilibinia angusta, 

 Lockingtou. 



** Ambulatory legs of moderate length. 



a. Carapace not spinose. 



*Hemus, a. Milne-Edwards. Eostrum deflexed, notched at 

 the extremity. Basal joint of antennae enlarged ; the second and 

 third joints also dilated and visible from above, with lateral wing- 

 like expansions. Merus joints of the ambulatory legs consider- 

 ably dilated. Type Hemus cristulipes, A. Milne-Edwards. 



IIyas, Leach. Eostrum bifid ; tlie median fissure narrow. 

 Basal joint of antennre not much enlarged, the second joint mo- 

 derately dilated, the third joint narrow. Ambulatory legs not 

 dilated or compressed. Type Hyas araneus (Linn.). 



Chionoecetes, Kroyer (Feloplastus, Gerstiieker). Eostrum 

 notched, not deflexed. Basal joint of auteunje very narrow, 

 second and third not dilated. Ambulatory legs in the adult willi 

 the joints somewhat compressed and flattened. Type Chionoceetes 

 opilio, Kroyer. 



b. Carapace spinose. 



ITerbstia, Milne-Edwards (Ehodia, Bell, Micropisa, Stimpson). 

 Eostrum notched. Carapace broadly triangular,ATith the regions 



