EXPLANATION OF PLATES. 



PLATE 28. PAGE 



HELIOPHYLLUM IGNOTUM. N. Sp. 85 



FIG. 1. — Lateral view of a matured specimen, exhib- 

 iting the strong annulations and con- 

 strictions. 



FIG . 2. — Posterior and calix view of another exam- 

 ple, exhibiting the coalescing, and twist- 

 ing of the lamella3 in the bottom of the 

 calix. 



HELIOPHYLLUM ADNASCENS. N. Sp. 85 



FIG . 3. — Calix view of a simple corallum, a portion 

 of the calix is broken away, but the artist 

 has failed to indicate this. 



FIG. 4. — Lateral view of a perfect composite coral- 

 lum, natural size. 



FIG. 5. — View of a longitudinal section of a compos- 

 ite example, exhibiting the elevated la- 

 mella3 in the bottom of the calix, and ex- 

 hibiting the interlamellar vesiculose 

 space, natural size. 



ZAPHRENTIS AMPLEXIFORMIS. N. Sp. 86 



FIGS. 6-8. — Lateral views of two examples, where a 

 portion of the cup has been removed to 

 exhibit the broad tabuhc, and the deep 

 calix, and flattened lamellae. 



FIG. 7. — Lateral view of another individual, exhib- 

 iting the curved point of attachment, and, 

 the root-like processes, that served for 

 support. 



