126 =Mr. F. M‘Coy on some new genera and species of 
This magnificent species is the only true Astrea I have yet 
seen from the paleozoic rocks, the numerous corals of this age 
described under this generic title by British and foreign authors 
belonging for the most part to the family Cyathophyllide, often 
transversely septate in the middle and having solid polygonal 
divisional walls to the stars—characters completely at variance 
with those of the recent and mesozoic Astrea, and indicating 
important differences in the animals and mode of increase. 
Abundant in some parts of the carboniferous limestone near 
Bakewell, Derbyshire; more rare in the same formation at 
Corwen. 
(Col. University of Cambridge.) 
Heterophyllia (M‘Coy), n. e. 
Gen. Char. Stem elongate, subcylindrical, irregularly fluted lon- 
gitudinally: horizontal section, few, 
distant lamellz destitute of any order 
of arrangement, but irregularly 
branching and coalescing in their 
passage from the thin solid external 
walls towards some indefinite point 
near the centre, where the few main 
lamelle irregularly anastomose : ver- 
tical section showing about the middle 
an irregularly flexuous line (the edge 
of one or two of the radiating vertical 
lamellee), from which on each side a’ | 
row of thin, distant, 35 gmoidally Heterophyllia: a. exterior of 
curved plates extends obliquely up- stem; %. horizontal and 
wards and outwards, forming a row of _ vertical section. 
large rhomboidal cells on each side. 
The paradoxical characters of the lamelle—their perfect want 
of symmetry of disposition, and their irregular branch-like union 
among themselves, together with the remarkable openness of the 
cellular structure, render those corals totally unlike any other 
recent or fossil group. From Cladocora and Caryophyllia, to 
which they are most allied, they are distinguished by the want 
of the cellular axis, and by their few, unsymmetrical and anasto- 
mosing lamelle. I suspect the Cladocora? sulcata of Lonsdale 
may belong to this group, but I have not seen examples of it 
myself. 
! 
it 
| 
Heterophyllia grandis (M‘Coy). 
Sp. Char. Stem slightly flexuous, about 5 lines m diameter, 
scarcely tapering in 3 inches, longitudinally marked with deep 
unequal grooves, and few, large, polygonal, unequal ridges, 
