Paleozoic Corals and Foraminifera. 123 
both, and separate them at a glance from the three other pub- 
lished species. 
Common in the carboniferous limestone of Derbyshire, form- 
ing subcylindrical masses 3 or 4 inches long. 
(Col. University of Cambridge.) 
Michelinea grandis (M‘Coy). 
Sp. Char. Corallum widely conic, the width considerably exceed- 
ing the height, externally marked with thick, rounded, radia- 
ting ridges, finely wrinkled across; polygonal cells, on the 
upper convex surface, averaging 5 to 8 lines in diameter (most 
near the former at a height of half an inch, most near the 
latter size at a height of 2 inches), very deep with thin walls 
not coated by vesicular plates, but having numerous distinct 
foramina and many longitudinal striz within ; internal vesi- 
cular plates small, very thin, much curved, forming nearly 
horizontal rows of vesicles at the bottom of the cells. 
This fine species is most allied to the M. tenuisepta (Phil. sp.), 
but is distinguished by the much wider conical form of the mass 
and by the cells having, on an average, a diameter three times 
greater at the same height than in that species, of which I have 
examined many specimens both British and foreign, and find the 
figures of Michelin and Koninck, as well as of Prof. Phillips, exact 
in this respect. Young specimens (1 to 2 inches in diameter) 
shghtly resemble the M. favosa (Gold. sp.) in form, having the 
base much flatter than in the adult, but on comparison with 
authentic Belgian specimens they are found to be distinguished 
by the large rounded radiating ridges on the exterior, of which 
no traces exist in that species, as -may be also seen from the 
figures of Goldfuss and Michelin ; the cells also of the present 
species are, even at that stage, larger, and increased growth de- 
stroys all resemblance. The M. megastoma (Phil. sp.), which 
has large cells (although much less than the present species), is 
distinguished by its mode of growth, it forming large flattened 
expansions ; internally its vesicular plates are much larger, fewer, 
and highly inclined at the circumference, coating the walls of the 
cells to their very edge, giving them a peculiar thick tumid ap- 
pearance, which may be imperfectly recognized in the worn 
specimen figured by Prof. Phillips, but which distinguishes 
even fragments from the other four species. Average height of 
the conical masses 2} inches, width 31 inches. 
Very common in the carboniferous limestone of Arnside, 
Kendal. 
(Col. University of Cambridge.) 
a 
