NATURAL HISTORY SOCIETY OF GLASGOW. 257 



London/^ Dr Duncan has figured and described six new species of 

 carboniferous corals, belonging to the genus Heterophyllia of M'Coy, 

 from specimens found in Scottish carboniferous limestone strata. Of 

 these species two, //. Lyelli and H. mirabilis, seem to be founded on 

 portions, which the careful examination of better preserved speci- 

 mens would have shown to belong to only one good species. 



I would not have ventured to make the follomng remarks upon 

 these corals, had not the localities from whence they are obtained 

 been long and familiarly known to me ; and I am satisfied, after a 

 careful examination of more than fifty specimens, large and small, 

 and in all states of preservation, that they all belong to one species, 

 in which the external characters and internal structure vary to a 

 certain extent. 



In order to show the close connection that exists between these 

 two so-called species, I will quote Dr Duncan's description of the 

 corals, side by side, with the parts numbered, so that the points 

 of specific distinction may be more easily perceived, and will then 

 make my remarks in support of what I consider their identity. 



Heterophyllia mirabilis, sp. nov., 

 Heterophyllia Lyelli, sp. nov., Duncan. j. 



1st. The corallum is very long, very 1st. The corallum is tall, very 



slender, and is slightly bent. slender, and nearly straight. 



2nd. The costae are large, smooth, •2nd. The costse are narrow, rounded, 



and rounded; they project, and are smooth, and slightly projecting; they 

 marked with occasional tubercles, pits, have tubercles at regular and frequent 

 and grooves. intervals. These tubercles are rounded 



and oblique, and project slightly. To 



each of them is articulated a curved 



hook-shaped process, which stands out 



from the costse and the tubercles, its 



concavity being directed inwards and 



downwards. 



3rd. The intercostal spaces are wide 3rd. The intercostal spaces are 



and shallow, and equal; they are shallow, wide, and usually convex, but 



slightly concave, and are marked occasionally concave ; they are marked 



with festoon-shaped ridges or lines. with threelongitudinal delicate shallow 



grooves, with very slightly rounded 

 longitudinal eminences between them. 

 A groove is central. 



*-0n the Genera Heterophyllia, Battershyia, Palceocyclus, and Asterosmilia; 

 the Anatomy of their Species, and their position in the Classification of the 

 Sclerodermic Zoantharia. By P. Martin Duncan, M.B. Lond., F.G.S., Secretary 

 to the Geological Society. — Read May 2, 1867. 



