a iil 
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ish "Timestone. It differs from the C. ee 
in the form and number of its articulations; in th 
shape of the head; in having only two flat. iit 
lous elevations on the fi rontgaand i in other particulars. 
In the cabinet of the New York Lyceum, and in 
that of J. P. Wetherill, Esq. there are soriie examples 
of this species from the Miami river, near Cincinna- 
ti, Ohio. I have also seen it from Indiana, in a dark 
coloured limestone, very much distorted. It has 
never been found at Trenton falls, or at any other lo- 
cality, as far as my knowledge extends, which yields 
the true C. Blumenbachii. 
. : : . * 
CALYMENE SELENECEPHALA.* Green. Cast No. 3. 
©: : 
Clypeo antice rotundato, margine omni valde ae 
crassato; prominentia frontali utrinque trituberosay .’ 
corpore tuberculato. — Pi 
“ty buckler is regularly lunates the matgin is 
sig reflected or raised anteriorly, the posterior 
e forms a continuous rim, running nearly parallel 
Ww an the articulations of the abdomen. The front on 
each side has one large and two small tubercles, near’ 
its superior edge. The oculiferous tubercles on the 
cheeks are on a line with the lowest frontal tubercle. 
There are fourteen distinct articulations; but as the 
tail is mutilated and distorted, the total number of 
joints cannot, from this specimen, be ascertained. 
The body appears to have been covered with smali 
* From the Greek for “ Junate head.”’ 
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