PLATE XLVI. 



Aristeus armatus (p. 312). 

 </. Mandible or siagon. 

 ma. Metastomata. 



e. First maxilla or first siagnopod. 



f. Second maxilla or second siagnopod. 

 c/. Maxillipede or third siagnopod. 



br. Branchial plume, seen in section. 

 br". Secondary branch of branchial plume. 



Fig. 1. Aristeus ? (young) (p. 240). 



