52 



termination of our species, is not covered with ini- 

 nute dots, as in the European fossil; and if a new 

 name is to be applied to it on that account, it may be 

 called A. glabratus* M. Wahlenberg, has given 

 the figure of a trilobite which he calls caudatus, but 

 ours cannot be mistaken for that species, to which 

 Brongniart has very judiciously applied the name of 

 A. meucronatus. 



The conical eye-like protuberances on the head of 

 this species, are very remarkable, and so much re- 

 semble the reticulated eyes of the limulus, as to 

 leave no doubt that they once contained the organs 

 of vision. 



ASAPHUS HAUSMANNI. Brongniart. 



Cauda rotundata; cute coriacea tuberculis mini- 

 mis spinulosis tectu. 



In De la Beche's Geological Manual, there is a 

 list, of the trilobites which have been discovered in 

 the grawacke group of rocks. This list we have 

 given in our introduction. Among the trilobites he 

 states that the Asaphus Hausmanni has been found 

 in the United States; as we have not seen the species, 

 and presuming the author to be correct in his locali- 

 ty, we give the following description from Professor 

 Brongniart. 



* In the cabinet of G. W. Featherstonhaugh, Esq., I have ex- 

 amined a fine specimen of the A. caudatus, from Dudley, Eng- 

 land, but could not perceive the minute dots on the tail, as men- 

 tiojned by Brongniart. 



