Foerste.] 
272 
[May 1, 
but little since this was well determined only in the type specimen, 
and experience shows that the numerical arrangement of these tu- 
bercles is not inviolable. 
The two pygidia from Collinsville, Alabama, show only seven 
well marked lateral pleurae. The rows of tubercles on these pleurae 
are perhaps a little more distinct than usual but the distinctness of 
these tubercles we have found to be exceedingly variable. 
All of these Clinton forms belong to one species and none of 
the material at hand permits us to draw any distinctions between 
our American and the typical European forms. Professor Hall, in 
the second volume of the Paleontology of Ohio, distinguishes the 
New York Clinton specimens formerly described under E . punctatus, 
from the European types, and associates it with a larger form from 
the Guelph of Ohio, from which he establishes a new species, E. 
orncitus. Whether the Ohio specimens of E. ornatus , Hall, should 
also be associated with E. punctatus as known to us at least from 
the numerous Clinton localities, we cannot say, although I have 
seen E. ornatus in various sizes. The spaces between the lateral 
pleurae of the pygidia seem to us relatively much larger, and we 
acknowledge that this, in conjunction, with the larger size of the 
pygidia and the higher geological position to which they attain, 
has rather prejudiced us in favor of considering them distinct. 
Lichas Boltoni, var. occidentalis, Hall? 
A single pleura, which is easily recognized to be that of some 
species of Lichas, was found at Cumberland Gap, Tennessee. 
From its size, shape and ornamentation, I should judge it to be 
identical with or closely allied to Lichas Boltoni, Bigsby, var. occi- 
dentalis , Hall. The shallow groove along the median line of the 
pleura rapidly disappears where the pleura makes its falchion-like 
curve. The tubercles are small but very numerous, and closely set. 
Cyphaspis Clintoni, sp. nov. 
(plate IY, FIG. 22.) 
There has been found at Anticosti a glabella of irregular oblong 
ovoid form, widening below, the postero-lateral portions being al- 
most cut off by a deep groove, thus forming ovate lanceolate, convex 
lobes, which still remain attached to the glabella at their anterior 
extremity, the defining groove being here suddenly obsolete. An- 
tero-posteriorly the convexity is slight ; from side to side, consid- 
