1862,] MR. J. Y. JOHNSON ON NEW MADEIRAN CORALS. 197 



at the British Museum there is another coral with the same shell 

 still adhering to it. 



The present form, though at the first glance it seems to have a 

 general resemblance to A. fiabelliformis, is quite distinct from that 

 species, having the cells much larger and transversely oblong, not 

 round. Moreover, the zigzag character of the branches is much 

 more marked. It may, however, be worth inquiry whether it may 

 not be the A. infundibulifera of Lamarck. 



A. maderensis appears to show that the genera Stylaster and Al- 



lopora ought to be united ; for though there are no " petites pointes " 

 or " tubercules vesiculaires " upon this coral (M. Milne-Edwards 

 giving this as one of the characters of Stylaster), yet the gemma- 

 tion is alternate and distichal — the same writer saying of Allopora 

 that its gemmation is " tout-a-fait irreguliere." 



DESCRIPTION OF THE WOODCUTS, pp. 195 and 197. 

 Acanthogorgia atlantica. 



Fig. 1. Outline of the entire specimen, on a reduced scale. 



Fig. 2. Portion of a branch, enlarged. 



Fig. 3. A cell more highly enlarged. 



Fig. 4. A spiculum from the edge of a cell. 



Fig. 5. A spiculum from the side of a cell. 



Acanthogorgia grayi. 



Fig. 6. Outline of a portion of the coral, on a reduced scale. 

 Fig. 7. A branch, enlarged, for comparison with fig. 2. 

 Figs. 8, 9. Spicula from the edge and side of a cell. 



Acanthogorgia hirsuta. 

 Figs. 10, 11. Spicula from the edge and side of a cell. 



Allopora maderensis. 



Fig. 1. A branch, with its ramuli, of the natural size. 



Fig. 2. A ramulus magnified. 



Fig. 3. A cell more highly magnified. 



