02 DESCRIPTION OF THE PLATES. 



PLATE III. 



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Fig. 1. Leptocyathus S impsonil Pourt., mag. 4 times. 



" 2. The same, from above. 



" 3. The same, from below. 



" 4. Ctxjlosmilia fecunda Pourt , mag. twice. 



" 5. The same, calicle, mag. 4 times. (The specimen has a small rudiment of a columella, 



but by no means as large and distinct as represented by the artist.) 



" G. Galaxea eburnea Pourt., mag. twice. 



7. The same, calicle from above. 



8. Ceratocyathus prolifer Pourt., specimen showing mode of budding from calicle of 

 parent, nat. size. 



9. The same, calicle from above, mag. 3 times. 



" 10. The same, vertical section, showing dissepiments. 



" 11. Stenocyathus vermiformis Pourt., specimen with calicles at both ends, nat. size. 



" 12. The same, calicle magnified (more common form than Plate I., fig. 2). 



" 13. The same, part of horizontal section, showing small cavities communicating with 



Interseptal chambers. 



" 14. Allopora minlacea Pourt., nat. size. 



" 15. The same, branchlet, mag. about twice. 



" IG. The same, calicle, mag. 10 times. 



" 1 7. Lepldopora cochleata Pourt., nat. size. 



" 18. The same, end of branchlet, mag. about 50 times. 



" 19. The same, vertical section, mag. about 50 times. 



PLATE IV. 



Rhizotrochus fragills Pourt., mag. twice. 

 The same, calicle from above. 



The same, horizontal section, to show internal orifices of the roots. 

 The same, horizontal section through the peduncle, to show the hollow roots. 

 Balanophyllla florldana Pourt., mag. twice. 

 The same, calicle from above. 

 Piiobothrus symmetricus Pourt., nat. size 

 The same, end of branch, mag. 4 times. 

 Piiobothrus tubulatus Pourt., nat. size. 

 Stylaster erubescens Pourt., small specimen, nat. size. 

 The same, branchlet, mag. 4 times. 

 DIstlchopoi'a foliacea Pourt., nat. size. 

 The same, side view of branchlet, mag. 4 times. 



DIstlchopora sulcata Pourt., side view of branchlet, mag. 4 times (see Plate VII., 

 fig. 7). 



PLATE V. 



Diaserls crispa Pourt., mag. 5 times. 

 The same, from above, mag. 4 times. 



Thecocyathus la;vigatus Pourt, vertical section showing internal roots setting oflFfrom 

 interseptal chambers, mag. 4 times. 



4. The same, horizontal section through base, showing extremities of internal roots, mag. 



4 times. 



5. Desmophyllum solidum Pourt., mag. twice. 

 G. The same, calicle, from above. 



7. Dendrophyllia cornucopia Pourt., nat. size. 



8. The same, calicle from above. 



!». Deltocyathus Agassizii Pourt., variety, from the side (see Plate II., figs. 1 to 5), mag. 

 3 times. 



10. The same, from below. 



1 1. Ocullna tcnella Pourt., nat. size. 



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