42 



toad or frog, with a narrow raised rim on the upper 

 and under lip. Below the chin there are no pustula- 

 tions. Cheeks small, triangular, and separated from 

 the front by a deep, rectilinear furrow; the eyes in 

 our specimen are much injured, but they are large, 

 and near the upper angle of the cheeks. Middle lobe 

 with a series of distinct double articulations. Lateral 

 lobes wider than the middle lobe, ribs deeply grooved 

 near their insertion; articulations of the abdomen 

 twelve; of the tail ten. Length four inches and a 

 half; breadth of the buckler nearly two inches. 



This fossil was presented to me some time since 

 by Thomas P. Johnson, Esq., who mentioned that it 

 was found in New Jersey, but that he could not learn 

 its precise locality. Near Patterson, in that State, 

 some trilobites have been discovered perhaps the 

 C. Bufo may have been derived from that locality. It 

 is composed of a dark greyish limestone, easily cut 

 with a knife. 



CALYMENE BUFO. Variety, RANA. Cast Nos. 1 1 & 12. 



This fine specimen differs from the one above de- 

 scribed, in having the front of the buckler rather 

 smaller, and of a different contour. The whole of 

 the shell is also covered with granulations, which 

 only appear on the head of the other; this, however, 

 may be only an imperfection in the specimens in our 

 cabinet. 



I am indebted to the Albany Institute for the origi- 

 nals of the models Nos. 11 & 12. They were found at 



