STALK-EYED CRUSTACEA 301 



maxilHpedes are completely hid behind the fourth joint. 

 — {Leucosidc^.) 



II. Posterior legs feebly developed, and raised on the 

 dorsal surface. — {Dorippidce.) 



Family I. Calappidae. 



CalappidcE Dana, Miers. 



Calappiens (part) . . H. Milne Edwards. 



Afferent channels to the branchiae opening behind the 

 pterygostomian regions, and in front of the first pair of 

 legs; the fifth and following joints of the external maxil- 

 Hpedes are not wholly concealed by the fourth joint. The 

 intromittent sexual organs in the male are exserted from 

 the base of the last pair of legs. Posterior legs normally 

 developed. 



Subfamily Calappinae. 



CalapphuB .... Dana, Miers. 



The four posterior pairs of legs are formed for walk- 

 ing, not dilated and expanded for swimming. 



Synopsis of the Genera. 



A, No large lateral spine on fifth joint of first pair of 

 1 egs. — ( Calappa.) 





Calappa. Acanthocarpus. 



B. A large lateral spine on fifth joint of first pair of 

 legs. — {Acanthocarp7is^ 



