40 
United States. According to Dr. Ji E. Dekay,* the. 
Macrophthalma is found on the Helder berg mountains, 
near Albany, and at Coshung creek, not far from 
Seneca lake, in the State of New York. It occurs 
also at Leheighton, in Pennsylvania—-at the Falls of 
the Ohio, and at several other localities. We have 
examined a number of specimens of the C. Macroph- 
thalma, contained in the rich cabinet of fossils, in 
the Academy of Natural Sciences, and have never 
seen any individual which resembles the fig. 4, Plate 
I. of Brongniart; and in no instance is the front of 
buckler marked by three oblique folds, a charac- 
ter stated as peculiar to this species. The C. Macroph- 
thalma, (variety) occurs in large quantities in Le- 
heighton in Pennsylvania, and we are indebted to 
Mr. D. Keim, for some fine specimens from that lo- 
cality. 
The authority of Professor Brongniart is sufficient 
to place the C. Macrephthalma among the species of 
the United States, though we have been unable fully 
to identify it with his description.t He received a 
*See Annals of Lyceum, Vol. I. p. 188. 
t We have seen in the Cabinet of Mr. Fouthiianmeeilal a fine 
group of trilobites, in the transition limestone, from Dudley, 
(Eng.) Among them there is a perfect head, which agrees eX- 
actly with the description given by Mr. Brongniart of the head 
of his Calymene Macrophthalma. If this belongs to the true 
macrophthalma, our species under that name is entirely distinct. 
Since our work had been prepared for the press, Dr. J i Cohen, 
of the Baltimore College, has shown us the fragment of a caly- 
mene from Berkley, Virginia, which agrees with Brongniart’s de- 
eee a a , 
