340 



A HISTOEY OF RECENT CRUSTACEA 



SYNOPSIS OF THE 



Maxillipeds with the ' palp ' free, 

 the margins of the last two 

 joints more or less setose, never 

 furnished with hooks 



First maxillae with the plate of 

 the third joint tolerably broad, 

 at least towards the middle 



Mandibles with the distal half 

 stout, very conspicuous, un- 

 covered, or with only the an- 

 terior margin concealed ; from 

 the base towards the middle 

 directed forwards and a little 

 outwards 



\ 



Mandibles with the distal half 

 narrow, most or all of it con- 

 cealed by the upper and lower 

 lips ; from the base towards the 

 apex directed gradually inwards 



Maxillipeds with the ' palp ' em- 

 bracing the cone fornfed by the 

 distal parts of the mouth-organs, 

 the inner upper margin and 

 apex never setose, the apex and 

 sometimes the inner upper mar- 

 gin, at least in the males and <( 

 the females without eggs, being 

 furnished with outward curved 

 hooks 



First maxillas with the plate of 

 the third joint narrow through- 

 out 



Distal parts of the mouth-organs' 

 forming a cone directed some- 

 what forwards 



Second maxillas small, feeble, with- 

 out hooks 



Maxillipeds with the fourth and 

 fifth joints coalesced, forming a 

 very long joint 



Distal parts of the mouth-organs 

 forming a short subvertical cone 



Second maxillse large, elongate, 

 and proportionately broad, with 

 two apical plates furnished with 

 hooks 



Maxillipeds with the fourth and 

 fifth joints sometimes coalesced, 

 never forming a long joint 



