40 



United States. According to Dr. J. E. Dckay,* the C. 

 Macrophthalma is found on the Helderbergmountains, 

 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 

 the 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 arc indebted to 

 Mr. D. Keim, for some fine specimens from that lo- 

 cality. 



The authority of Professor Brongniart is sufficient 

 to place the C. Macrophthalma among the species of 

 the United States, though we have been unable fully 

 to identify it with his description.! He received a 



* See Annals of Lyceum, Vol. I. p. 188. 



t We have seen in the Cabinet of Mr. Featherstonhaugh, 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. J. Cohen, 

 of the Baltimore College, has shown us the fragment of a caly- 

 mene from Berkley, Virginia, which agrees with Bvongniart's de- 



