The Voyage of H.M.S ."Challenger." 

 1. 



■4 i 



5. 



13. 



l/l! 



17. 



2. 



Ti 





' 



15. 



T 



ii. 



14. 



19. 



Asteroidea.pl. XXVII. 



J 



16. 



20. 



F H Michael del 





1-4. P RC E LL AN ASTE R CRASSU5, nsp 5-8. PO RC ELLAN ASTER GRACILIS, n. sp. 



9-12. P RC E LL AN AST E R CAUL1FER, nsp. 13-16. PORCELLANASTER TUBEROSUS, nsp 



17-20. STYRACASTER H0RR1DUS, nsp 



