228 



THE VOYAGE OF H.M.S. CHALLENGER. 



Pleurobranchias, 

 Arthrobranchia?, 

 Podobranchioe, 

 Mastigobranchiae, 



Pleurobranchise, 

 Arthrobranchiae, 

 Podobranchise, 

 Mastigobranchias, 



Haliporus. 



Pleurobranchire, 

 Arthrobrancbia?, 

 Podobrancbia3, 

 Mastigobranchifp, 



Aristeus. 



