TRILOBITES, &. * 
=) Ga 
» CatyMene? Opontrocepnata.* Green. Cast, No. 36.’ 
Clypeo subtriangulari, antice ornato ; oculis magnis, 
eminentissimis ; corpore? , 
¢ 
The outline of the buckler in this very remarkable 
species, is subtriangular. The front is separated from 
the cheeks by a deep groove on each side, its anterior 
edge is ornamented on each side by a kind of Etrus- 
can border, composed of alternate projections from the 
outer edge of the shell inwards, and from the inner 
portions of the shell outwards ; the square protrusions - 
on the one side, occupying intermediate square spaces 
on the other. This singular and beautiful structure 
does not surround the anterior edge of the cheeks, 
but terminates at the separating furrow on each side. 
At the first glance, these projections in front, give to 
the trilobite the appearance of teeth. The surface of 
The Greek for “ toothed head.”’ 
D £6 fr? 2 
~ Oy otis’ # ae 
