1867.] DUNCAN — WEST-INDIAN COKALS. 33 



describe live species of Desmopliyllum from the recent Caribbean 

 Coral-fauna, it is " pourtant singulier " that I should not mention a 

 single fossil species. Now this proves to me that my able fellow- 

 laboiu'crs only study " d'autres ouvrages, outre ceux qu'on public 

 en Angleterre" (p. 157) ; for, according to what I have written, it 

 would be " pourtant singulier " if there were fossil species of Des- 

 mophyllum in the West- Indian Miocene. Mr. A. E. Verrill will find 

 many species of the genus Astrangla noticed in the Caribbean Sea. 

 M. Duchassaing and Michelotti give a Silurian age to Favosites 

 Dietzi, Duch. & Mich., and F. Sancti Tlio7nce, Duch. & Mich. I 

 retain my species Lithopliyllia affinis, as it presents sufficient struc- 

 tural differences to prevent its being called L. laceva. 



The Isastrcea I described has spines on its septa, and only the 

 base has been rolled or shows the effects of rolling ; this is clearly 

 stated in the description of the species. It is impossible to confound 

 any species of the genus with Plesiastrcext, whose calicos are free and 

 whose septa have pali. 



EXPLANATION OF PLATES I. & II. 



Plate I. 



Fig. 1. a. Columnastraa Eyrei, sp. nov. The corallum nat. size. 

 b. Calices magnified. 



2. a. LamellastrcBa Smythi, sp. nov. Transverse section, nat. size. 

 b. Transverse section of coral lites, magnified. 



3. a, Diplocoenia monitor, sp. nov. Transverse section, nat. size. 



b. The same section, magnified. 



c. Longitudinal section, magnified. 



4. Heliastrcea insigtiis, sp. nov. Transverse section of a corallite, mag 



nified 2 diameters. 



5. a. Pocillopora tenuis, sp. nov. Transverse section, nat. size. 



b. The same, magnified. 



c. Longitudinal section, magnified. 



Plate II. 



1. Stephanocmiia Reussi, sp. nov. Transverse section, magnified. 



2. a. Placotrochus Savjkinsi, sp. nov. Corallum, natural size. 

 b. The calice, slightly magnified. 



3. Heliastrcsa altissvna, sp. nov. Calice, magnified. 



4. liracJiT/phyllia EcJceli, sp. nov. Calices, magnified. 



5. irregularis, spec, nov. Calices, magnfied. 



6. Isastrcea confusa, spec. nov. Calice, magnified. 



VOL. XXIV. PAET I. 



