484 Mr. L. A. Bovradalle 07i the 



ii. Mevopodites of third iiiaxillipeda lonpfer 

 tliau broad, bearing carpopodites on fore 

 edire, which slopes iuwards TrichodactyUnee. 



Key to the Subfamilies of the Atelecyclida?. 



I. Antennal flagella absent. [Mouth covered 



by third maxillipeds. Front uncleft.] .... Acanthocydince. 

 II. Antennal tiagella present. 



A. Regions not detiued. Third maxillipeds 



cover the mouth. Front entire or lobed . ThiincB. 



B. Regions more or less clearly marked out. 



Third maxillipeds do not cover the mouth. 



Front toothed AtelecycliiKP.. 



Key to tJie Subfamilies of the Cancridpe. 



I. Carapace broadly oval. Epistome not sunken. Cancrince. 

 II. Carapace hexagonal. Epistome sunken .... PirimelirKS. 



Key to the Subfamilies of the Xanthidse. 



I. Endostome ridges wanting. Shape of body 

 transversely oval or round. 



1. Flagella of second antennae not shut out 



of orbital gaps. 



i. Second joint of second antennal stalk 

 cylindrical, reaching front but not 

 entering orbital gap Xanthince. 



ii. Second joint of second antennal stalk as 

 in Xauthinse, but not entering orbital 

 gap C'arpiHncB. 



2. Flagella of second antennas shut out of 



orbital gaps by part of second joints of 



stalks Etisiiue, 



II. Endostome ridges present. Shape of body 

 often square or squarish. 



1. Front less than h, and fronto-orbital edge 



(front and orbits together) not more than 

 § the greatest breadth of the carapace. 

 Front usually makes an arch with antero- 

 lateral edge. Flagella of second antennae 

 usually not shut out of oi'bital gaps. 

 i. Second joint of second antennal stalk 



cylindrical and may or may not reach 



the front, with which it is not broadly 



in contact. Endostome ridges vary in 



shape and size MenippiruB. 



ii. Second joint of second antennal stalk 



somewhat irregularin shape and broadly 



in contact with front. Endostome 



ridges strong and project on fore edge 



of mouth Oziina. 



2. Front at least \ and fronto-orbital edge 



more than § the greatest breadth of the 

 carapace. Front makes an angle with the 

 antero- lateral edge. Flagella of second 

 antennae always shut out of orbital gaps. 



