The Voyage of H.M. S "Challenger' 



Asteroidea.PLX. 



W H CroMW- d«l 



MinLerr. Bros . imp 



1-2. PONTASTER PLAN ETA, n sp. 3-4- . D YTASTER BISERI ALIS.n.sp. 



5-G. DYTASTER I NERMIS , n.sp. 



