A. M Verrill — Comparisons of Coral Faimoe. 201 



Plate XVI. 



Figure 1. — Miissa {IsophylUa) fvagilis D. Side view of Dana's original type, No. 



4298. Natural size. Page 121. 

 Figure 2. — The same. A well-grown normal sijecimeu, from the Bermudas. 



Natural size. Page 121. 



Plate XVII. 



Figures 1, 2. — Mussa {IsophylWi) fragilis Dana. Top and bottom views of a 

 symmetrical young specimen, having five primary lobes or infoldings of the 

 margin. About natural size. Page 124. 



Figure 3. — The same. A young specimen of about the same age, having 6 mar- 

 ginal folds, with the margin stellate below. About natural size. Page 124. 



Figure 4. — The same. A younger specimen with four marginal folds. About 

 natural size. 



Figure 5. — The same. A large mature Bermuda specimen, with numerous cali- 

 cles, many isolated, }^ natural size. Page 121. 



Figure 6. — The same. A similar but smaller Bermuda specimen, reduced to }^. 

 Page 121. 



Figure 7. — The same. A specimen of the more common size and form, J-j nat- 

 ural size. Page 121. » 



Plate XVIII. 



Figure 1. — Mussa {Isophyllia) fragilis Dana. A symmetrical young specimen 

 with six primary marginal infoldings. Natural size. Page 121. 



Figure 2. — Mussa {Isopkyllia) dipsaeea Dana. A normal, nearly regular Ber- 

 muda specimen of the ordinary size. Natural size. Page 118. 



Figure 3. — Axohelia Schrammii Pourt. Part of a branch of No. 5662. x 2}^. 

 Page 110. 



Figure 4. — The same. Part of a branch. No. 5662. x 2. Page 110. 



Figure 5. — Mussa {Isophyllia) dipsaeea Dana. Part of the calicles of a large 

 Bermuda specimen, to show character of dentition. Natural size. 



Figure 6. — Mussa {Isophyllia) fragilis Dana. Part of the under side, to show 

 character of the costae and of the epitheca {e). About natural size. 



Plate XIX. 



Figure 1. — Mussa {Isophyllia) fragilis Dana. A young Bermuda specimen vdth 

 double, jjartly separate walls, much like the type, but more regular in form. 

 About natural size. Page 123. 



Figure 2. — ilfitssa {Isophyllia) dipsaeea Dana. A Bermuda specimen with the 

 calicles mostly Isolated and the walls only partly united. Natural size. 

 Page 130. 



Figure 3. — The same. A young specimen with three primary infoldings, just 

 developing. Enlarged about 1^. Page 118. 



Figure 4. — Mussa {Isophyllia) fragilis (?). A young five-lobed example, with the 

 infoldings appearing earlier than usual in this species, and therefore resem- 

 bling M. muUiflora, to which it may belong. Natural size. Page 121. 



