PLATE XXIV. 



Heliophyllum ireegulare n. sp. 



Figs. 1, 2. Lateral and summit views of a small specimen, showing very distant lamelkc and a flat- 

 tened surface outside of the depression. 



Figs. .3, 4. Two views of a specimen in which the rays are a little more numerous. 



Fig. 5. Enlarged profile of a primary and a secondary 'ray of the preceding- specimen, showing the 

 form of the cup and the projecting denticles formed by the transverse ridges. 



Fig. 0. View of a more spreading young specimen. 



Fig. 7. View of a large specimen, showing a budding from the center of the cup. 



Hamilton group, Darien, and other localities of Western New Yorlc. 



Fig. 13. Transverse section of a specimen similar to Fig. 7. 



Heliophyllum Akachne n. sp. 



Figs. 8, 9. Two views of a specimen, showing the form of the corallum, the convex surface, .shal- 

 low cup and distant rays, with strongly elevated denticles representing the transverse 

 ridges. 



Figs. 10-12. Three views of another individual in which the transverse bars are nearly obsolete on 

 some parts of the corallum. Figs. 11 and 12 show the irregular projecting root-like 

 base of attachment. 



Fig. 14. Profile of a primary and secondary ray from the specimen Fig. 8, showing the form of the 

 cup and the projecting denticles. 



