2 Mr. F. M‘Coy on some new genera and species of 
in strength to the others as they approach the edge of the cup. 
The denticulation of the lamelle is scarcely perceptible. 
Not uncommon in the fine gray Devonian slates of New Quay. 
(Col. University of Cambridge.) 
Clisiophyllum Keyserlingii (M‘Coy). 
Sp. Char. Conical, slightly curved, terminal cell oblique, 1 inch 
2 lines in diameter in a specimen 3 inches long ; surface finely 
striated longitudinally (about eight striz in one-fourth of an 
inch) ; lamellz thin, equal, about fifty-one, descending straight 
into the deep part of the terminal star, and then abruptly 
twisted spirally about an imaginary axis, forming a prominent 
conical centre about one-third the diameter of the cup, and as 
high as its base is wide. 
This highly typical species of Mr. Dana’s American genus 
Clisiophyllum is closely allied to the Cyathophyllum coniseptum of 
Count Keyserling’s ‘ Wissenschaftliche Beobachtungen auf einer 
Reise in das Petschora-Land,’ from which it is distinguished by 
the strong twisting of the plates about the central cone, and by 
having little more than half the number of lamellz at the same 
diameter. Viewing with Mr. Dana the conical arrangement of the 
septa as a generic instead of a specific character, it seems probable 
that the two varieties given by Count Keyserling of his Cyath. 
coniseptum are really two species ; and the present species, though 
presenting some intermediate characters, is I think distinet; if 
hereafter any one should think otherwise, they still could hardly — 
object to the name I have proposed in honour of so enterprising 
a geologist, the more so as the term coniseptum would not be ap- 
plicable as a specific name in the genus Clisiophyllum, where all 
have the conical arrangement of septa alluded to; there can how- 
ever, I think, be little doubt of the distinctness of the species: In 
the transverse section the central area seems a confused, close 
crumpling of vesicular plates occupying rather more than one- 
third the whole diameter, and from it to the circumference the 
strong, equal, rather distant plates radiate. The external yer- 
tical strize are double the number of the actual radiating lamelle. 
Rare in the carboniferous limestone of Derbyshire. 
(Col. University of Cambridge.) 
Clisiophyllum bipartitum (M‘Coy). 
Sp. Char. Very elongate-conic, nearly cylindrical, with a dia- 
meter of 14 inch for the greater part of its length; strongly 
and regularly striated externally (about five strize in one-fourth 
of an inch) ; external striz corresponding in number to the 
radiating lamelle : in the transverse rough section the central 
area is rather less than one-third the whole diameter, composed 
of the edges of confusedly blended vesicular plates, crossed by 
