The American Geologist. 
Vol XII. Plate V. 
PTYCHOrHYLLUM EXPANSUM Owen Sp. 
Fig. 1, Short, conical individual with deep calyx. 
Fig. 2, Very short, comparatively young corallum, corresponding in di- 
mensions to Owen's Uyatkophyllum corinthiutn. 
Pig. 3, Corallum of average proportions with explanate calyx. 
Fig. 4, Port-ion of an elongated, cylindrical coralluin of the type de- 
scribed as Cyathoph yllum undulatum et multiplicatum. 
StBOMBOIDES GIGAS Owen sp. 
Fig. 5, Portion of a corallum showing the characteristic features of this 
species. 
