PLATE XXII. 



Phoberus tenuimanus (p. 171). 

 (Acanthocaris tenuimana on Plate.) 



Pereion, with the lateral wall of the carapace removed to show the natural position 

 and arrangement of the branchiae ; i, second gnathopod : k-o, pereiopoda. 



Section of a set of branchial plumes and mastigobranchias ; mb, mastigobranchise ; 

 pdb, podobranchia ; arb, arth, anterior and posterior arthrobranchias ; plbr, 

 pleurobranchia. Above this figure are seen portions of the anterior and \>< in- 

 terior arthrobranchia, showing their approximation, in situ. 



d. Siagon (or mandible) ; from the inside. 



e. First siagnopod. 



f. Second siagnopod. 



g. Third siagnopod. 



h. First gnathopod, with basecphysis, mastigobranchia] plate and podo- 



branchial plume. 

 i. Second gnathopod, with basecphysis, mastigobranchia I plate, and 



podobranchial plume. 



