340 



A HISTOKY OF RECENT CRUSTACEA 



SY^^OFSIS OF THE 



Maxillipeds with the * palp ' free, 

 the margins of the last two 

 joints more or less setose, never 

 furnished with hooks i 



First maxillse 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 



Maxillipeds with the 'palp 'em- 

 bracing the cone formed 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 curveid 

 hooks 



First maxillfB with the plate of 

 the third joint narrow through- 

 out 



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 



Distal parts of the mouth-organs 

 forming a cone directed some- 

 what forwards 



Second ma xillcB 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 maxilla 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 



