= ee 
32 
pustules, These are very evident on the front. ‘ 
tal arches simple, or not grooved. Length, one inch 
and three-fourths, breadth of the buckler one ah 
and one-fourth. Lie: 
_ This species resembles a little the C, Pulchella of 
Dalman. The specimen from which the model was 
taken, is in the possession of Mr. R. Peale, of New 
York, who willingly lent it for this monograph. He 
informed me that it was found in the state of New 
York, but he was unable to name its precise locality. 
It occurs in a soft ash coloured limestone. No other 
petrifaction is observable in the fragment of rock 
which contains it. , 
CALYMENE Pratys.* Green. Casts No. 4 and 3. 
Clypeo antice rotundato; prominentia frontali — 
utrinque quatuor tuberculis. | 
The buckler is probably semilunate; but as the an- 
terior portion is lost, this cannot be determined wi 
precision. The posterior raised rim is not contim 
ous, as in the C. Selenecephala, but is separate d by 
the longitudinal dorsal furrows. The front is distinct- 
ly divided from the cheeks, and has four tubercular 
prominences on each side. Three of them are near- j 
ly on a line with the lateral edge of the cheeks, and 
gradually diminish in size, as they descend to the 
anterior part of the buckler. The other is smaller, 
and is between, and a little to the side, of the upper 
“ From a Greek work which signifies Fiat. 
| 
rf 
