PLATE XVII. 

 Haimesiastrjea, Astroc(knia, Platyccenia, Stephanoccenia. 



rage. 



Figs. 1 to 6. Ihiimesiastraa 2>etrosa (Gabb) 146 



All figures from Gabb's type material in the collection of tbe University of Cali- 

 fornia, Berkeley, California. Fig. 1, a small specimen, natural size; fig. 2, a calice, 

 X 6, the ujiiier margins of tbe septa broken otf, showing the false columella; fig. 

 3, a perfect calice, X 6, showing the septal margins meeting in the axial space; 

 fig. 4, an oblicine longitudinal section of acor.nllite, x -0, showing the nodular char- 

 acter of the septa, dissepiments, etc. ; fig. 5, cross section of a corallite, X 20, show- 

 ing pseudotheca and false columella; fig. 6, general view of a rather large mass, 

 natural size. 



Figs. 7 and 7a. Aslroco nia piimpelhji sp. nov 149 



Fig. 7, general view of the coralluni, natural size; fig. 7a, calices, x 5. 



Fig. 8. Jsd-octrnia sp. dub.de Gregorio (after de Gregorio) ]98 



Figs. 9 to 9c. Platycn nUiJacli'sonensis gen. et sp. nov 150 



Fig. 9, profile view, x ft; fig. 9a, longitudinal section of corallite, x Gj; fig. 9b, view 

 of coralluni from above, natural size; fig. 9c, calices seen from above, X about 4. 



Figs. 10 and 10a. Slephanocucniafairhanlsi var. columnai-is var. nov 151 



Fig. 10, general view, natural size; fig. 10a, calice, x about 4. 



Figs. 11 and 11a. Stcpliavocirniafairhanlsi sp. nov 151 



Fig. 11, general view, natural size; fig. 11a, calice, x about 4. 

 All figures drawn by Dr. J. C. McConnell, except figs. 9 and 9a, which were drawn by .J. Henry 

 . Blake. 



242 



