SiliDi^'-a Expcditic. X. O. Maas. Ilvdromedusen. 



VI. 



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Chroniolith. P. W. M. Trap, 



Fig. 36, 37, Phialacium vii-ens (Bigelow.) Fig. 38, 39, 40. Irenopsis hexanemaJis (Goette.) 



Fig. 41, 42. Octocanna polynema (Haeckei.) 



