142 Zoological Society : — 



of 13 inches, and its branches have a spread of about 11 inches. 

 The stem, with its cells, has a diameter of 3^^^,- of an inch, and the 

 branches with their cells are only reduced to two-thirds of that dia- 

 meter. Near the base are the stumps of two branches which have 

 been broken off. Above, on one side, are two simple branches, and 

 on the other a single forking branch. These three branches are 

 placed not far apart near the middle of the main stem. 



It ought to have been mentioned, with reference to the woodcuts 

 of A. Grayi and A. hirsuta (Ann. Nat. Hist. 1862, ix. 75,76), that 

 the figures are considerably larger than the natural size. 



DESCRIPTION OF THE WOODCUTS. 



Acanthogorgia atlantica. 



Fig. 1. Outline of tlie 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. 



Fam. Stylasterid^. 

 Allopora maderensis, sp. n. 



Opake white. Much and closely branching nearly in one plraie, 

 the branches becoming gradually of less diameter, and sometimes 

 anastomosing. They zigzag from cell to cell ; and the surface is 

 finely reticulato- striate, but is without any tubercles. The cells are 

 oblong, sessile, and always placed transversely to the branch, upon 

 one face of the plane. The terminating cells, with their pedicels, are 

 trumpet-shaped, but with oblong mouths, which are much wider than 

 the stalk below. The margin of each cell is elegantly notched with 

 from twelve to sixteen notches, with laminae between. 



The dimensions of the single specimen that has occurred (now in 

 the British Museum) were 3^ inches high and 2\ inches across. 

 The base had been broken away, and the thickest part of the remain- 

 ing stem was ^th of an inch in diameter. The longer axis of the 

 terminal cells measured the twentieth of an inch. 



The specimen was brought up by a long fishing-line on the coast 

 of Madeira. Two examples of that curious patelliform shell the 

 Pedicularia sicula were found seated on the branches. With re- 

 spect to this circumstance, I may mention that Mr. S. P. Woodward 

 has shown me a coral from the coast of Sicily, belonging to a totally 

 distinct genus, with Pedicularice u])on it ; and in the Coral Room 

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

 still adhering to it. 



