55 
Dimensions.—Diameter of the disk, six-tenths of an inch; 
length of an arm, two inches and six-tenths of an inch. This 
is less than what it was in the living state, seeing that none of 
the rays are perfect up to their termination. 
A finities and Differences.—The fragmentary condition of the 
disk prevents any very definite conclusions as to the true 
generic position of this Brittle Star, which, however, agrees 
better with the diagnosis, of Ophiurella than any other con- 
generic form. It has the proportionately small disk, with its 
upper and under surfaces covered with fine granules; the arms 
long, compressed and flattened; the lateral and central plates 
carrying spines, which are specially articulated to the lateral 
pieces. In all these essential generic characters it agrees well 
with Ophiurella. I know of no figured or unfigured Ophiurida 
from the Corallian or other Jurassic strata which resembles 
the subject of this note. The only form occurring to my mind 
is that of Ophiurella bispinosa, (D’OrB.) which was only named, 
but neither figured nor described by D’Orzieny. Ophiurella 
nereida differs so widely from all other described forms, that it 
is impossible to make a mistake in confusing our species 
with any of them. 
I am indebted to the kindness of my old friend the Revd. 
Professor Wiitsuire, Secretary to the Paleontographical 
Society, for the loan of the wood-cut representing this fine 
fossil, and for which I beg to return him my best thanks. 
