Plate I 



Fig. I. — Zaplircntis parsonsensis, n. sp. Lateral view of a natural cast 

 of the interior of the corallum. 



Fig. 2. — Apical view of the same. 



Fig. 3. — Favosites foerstei, n. sp. Lateral view, showing the subhemis- 

 pheric base of the corallum. 



Fig. 4. — Basal view of the same, showing the subcentral point of attach- 

 ment and the wrinkled epitheca which covers the base. 



Fig. 5. — Pleurodictyum trifoliatum, n. sp. A mature colony attached to 

 one valve of Rhipidomella oblata. The apex of the initial coral- 

 lite is visible between the lateral corallites. 



Fig. 6.— Pleurodictyum trifoliatum, n. sp. An abnormal one-celled indi- 

 vidual which was not cemented to any solid object, x 2. The 

 lateral nodes, one on either side, are the aborted lateral coral- 

 lites. 



Fig. 7. — Another colony of the same species, with the three corallites 

 mutually contiguous. 



