450 



STALK-EYED CRUSTACEA 



The internal antennae may be in the form of a flattened 

 cylinder, depressed where the eye rests. There are two 

 flagella of equal or unequal length. The external 

 antennae have a large basal scale and a very long 

 flagellum. The maxillipedes are pediform. The first 

 three pairs of legs increase in length from before back- 

 wards, and also in thickness ; they are armed with pincers. 



Synopsis of the Genera. 

 A. Rostrum long 



Pcimiis. 



a. The abdominal appendages, except the first pair, 

 are two-branched, large. — (^Penmis.) 

 B. Rostrum short. 



Sicyoiiia. 



b. The abdominal appendages are one - branched, 

 short. — {Sicyonia.) 



c. Rostrum only a crest. 



Benthcsicymus, 



The abdominal appendages, except the first pair, are 

 two-branched, long. — {Boithesicymtcs.) 



