PLATE 36. 



Fig. 1. 519. 1. Heliolites eleganp. (Pag. 130.) 



1 a. A portion of the surface, showing the openings of the cells. 



1 ft. A vertical section produced by weathering. 



1 e. Enlargement of 1 a, showing the variable appearance of the cells. 



1 d. Enlargement of 1 b, showing the cells as they appear when weathered. 



1 «. A magnified view of a polished transverse section. 



1 /. A magnified view of a poli.shed vertical section. 



1 g. A magnified view from the lower side of the coral. 



Fig. 2. 520. 2. Heliolites spinipora. (Pag. 131.) 



2 a. A calcareous mass where the interstices between the rays are crystallized and prominent, the entire 



surfiico presenting a confused stellate appearance. 



2 b. A portion of the same enlarged, showing more definitely the limits of the stellate cells and the inter- 

 cellular lamellar or granular .surface. 



2 c. Several of the cells near the base of the same specimen enlarged, showing a different appearance from 

 2 ft. In these cells the centre is depressed. 



2 d. A vertical section of the small specimen fig. 2 a. 



2 c. A portion of the same enlarged, showing the spiniform ascending rays in the cell and the transverse sj^pta 

 in the interspaces. 



2 _/■. A figure ftom a polished piece of crinoidal limestone, showing a nearly transverse section of a spheroidal 

 mass of this coral, with a vertical section of another individual which apparently commenced growth 

 upon the preceding one. On the right hand is a section of a smaller species, also growing on the first. 



2 g. This figure is enlarged from the surface of the polished specimen, showing the charactois very distinctly. 



2 h. A portion of the vertical section in the same figure enlarged, showing the lamella! in the interior of the 

 cells with interrupted transverse septa ? 



2 t. An enlarged figure of a vertical section, showing tlie transverse septa crossing the cell directly and in- 

 terruptedly ; also in other cells having the appearance of spiniform ascending rays, as in fig. 2 e. 



2 fc. A portion of the surface of a weathered specimen, presenting the principal varieties of appearance as- 

 sumed by this coral. 



2 /, m, n. Enlargements showing the different aspects of the surface in fig. 2 fc. 



