J40 
Maxillipeds with the ‘ palp’ free, 
the margins of the last two 
joints more or less setose, never 
furnished with hooks 
First maxille with the plate of 
the third joint tolerably broad, 
at least towards the middle 
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 curved 
hooks 
First maxillze with the plate of 
the third joint narrow through- 
out 
A HISTORY OF RECENT CRUSTACEA 
SYNOPSIS OF THE 
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 
Distal parts of the mouth-organs 
forming a cone directed some- 
what forwards 
Second maxillz 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 maxillze 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 
