“ 
424 F. B. Meek—New species of Fossils 
ieces taper more rapidly upward, and are longer in proportion 
to the lateral ones. Its lateral pieces, on the contrary, ta 
The convex side of A. Hucleyi and the wpper 
parts of our type being unknown, we have no means of carry- 
ing the comparison further ; but enough can be seen to show 
beyond doubt that the two forms are at least clearly distinct 
specifically. 
Whether these several forms belong to one, two, or three 
genera, it must be evident, I think, to any one accustomed to 
study these old types of the Echinodermata, that in a systematic 
classification of the Cystoidea they will have to stand together 
men I have seen belongs to the collection of C. B. Dyer, Esq., 
of Cincinnati. I am also under obligations to Prof. 0. C. M. 
of New Haven, for the use of another more crushed specimen 
of the same or an allied species. Both of the specimens were 
discovered, I am informed, by G. W. Harper, Esq., of Cin- 
cinnati. 
in the Cincinnati group of the Lower Silurian. The best Es ; 
DALMANITES CARLEYI M. 
efined, a rgin ‘or lateral 
cheeks, and curving backward a little on the posterior 1a 
spines ; occiputal segment comparatively thick i 
posterior diameter at the midi 
