CORALS FROM THE DEVONIAN FORMATION. 223 



individuals) slender, but little developed, not very unequal in size ; some rudiments of 

 smaller septa between the former. 



The specimens figured in this Monograph (tab. xlix, fig. 5) about 4 inches long, and 

 about 1^ inch wide. Professor M'Coy justly remarks that the specimens described by 

 Mr. Phillips were young individuals, and mentions a gigantic specimen the diameter of 

 which was 1 inch 9 lines. 



The specimens here described were found at Torquay and Plymouth, and belong to 

 the collections of Dr. Battersby and Mr. Pengelly. The same species exists at Barton and 

 South Petherwin, according to Mr. Phillips, and at Newton Bushel according to Professor 

 M'Coy. 



This species resembles very much Amplexus Yandelli} and A. cornubovis^ but difiers 

 from both by the septa being less numerous and almost equal in size, and by the existence 

 of 4 septal fossulse. Amplexus coralloidei differs also from A. tortuosus by not having the 

 depressions on the tabulae, and by the circular wrinkles being larger. 



2. Ge7ius Hallia, (p. Ixvii.) 

 Hallia Pengellyi. Tab. XLIX, figs. 6, Qa, Qb. 



Hallia Pengellyi, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Pal., p. 354,1851. 



The calice of this coral is almost circular, with 54 principal septa, which alternate with 

 an equal number of small and thinner ones ; the former are very thick, straight, and 

 disposed in a regular radiate manner towards the circumference of the visceral chamber ; 

 towards their inner edge they are provided with a large and thin paliform lobe. The 

 cristiform septum is not as large as in Hallia insignis^ and it is the lobes belonging to the 

 principal septa situated near this that affect a pinnate mode of arrangement. The dissepi- 

 ments are very slender and closely set. Diameter 1 inch or more ; the area occupied by 

 the paliform lobes forms an elhpse of about 9 lines long and 6 lines broad. 



Found at Torquay, (Coll. of the Geological Society of London, and of Mr. Pengelly at 

 Torquay). We are inclined to refer to this species some young corals from Pethervin, 

 which are in a very bad state of preservation, and belong to the collection of the Geological 

 Society. They have a strong epitheca. 



In Hallia Fengellyi the characters of the generic type are not as distinct as in 

 H. insignis^ the large septum being less developed, and the adjacent septa not assuming 

 as regular a pinnate mode of arrangement ; it is also to be remarked that in H. insignis all 

 the septa are provided with a very large paliform lobe. 



1 Milne Edwards and Jules Hairae, Pol. Foss. des Terr. Palseoz., p. 344. pi. iii, fig. 2, 1851. 



2 Ibid., p. 343, pi. ii, fig. 1. 



* Tab. xxxvi, fig. I. 



* Milne Edwards and Jules Hairae, Pol. Foss. des Terr. Palseoz., p. 353, pi. vi, fig. 3, 1851. ' ibid. 



