PLATE 36. 
Fig. 1. 519. 1. Heliolites eleganp. 
1 a. A portion of the surface, showing the openings of the cells. 
1 b. A vertical section produced by weathering. 
1 c. 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 c. A magnified view of a polished transverse section. 
1 /. A magnified view of a polished vertical section. 
1 g. A magnified view from the lower side of the coral. 
(Pag. 130.) 
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 
surface presenting a confused stellate appearance. 
2 6. 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 b. In these cells the centre is depressed. 
2 d. A vertical section of the small specimen fig. 2 a. 
2 e. A portion of the same enlarged, showing the spiniform ascending rays in the cell and the transverse septa 
in the interspaces. 
2 /. A figure from 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 characters very distinctly. 
2 h. A portion of the vertical section in the same figure enlarged, showing the lamellae in the interior of the 
cells with interrupted transverse septa ? 
2 i. An enlarged figure of a vertical section, showing the 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 k. A portion of the surface of a weathered specimen, presenting the principal varieties of appearance as¬ 
sumed by this coral. 
21, m, n. Enlargements showing the different aspects of the surface in fig. 2 k. 
