124 TRILOBITES 



sides of the body ; but the antennae are very large and dis- 

 tinct. This genus has lately been described and figured in 

 detail in the Transactions of the Albany Institute, by Mr. 

 James Eights, under the name of Brongniartia. Much of 

 this diversity of opinion has resulted from the very much 

 worn state of the Trilobites, which have, in many instances, 

 been so rubbed, that their eyes have been entirely effaced ; 

 but it is questionable whether any Trilobite was ever desti- 

 tute of those organs, which Dr. Buckland has, in his Bridge- 

 water Treatise, described at great detail, in connexion with 

 their fitness for the situations in which the animals are sup- 

 posed to have resided. Mr. J. V. Thompson, in the last of 

 his Zoological Researches, has adopted the opinion of M. 

 Audouin, considering that the eyed Trilobites, Calymena, and 

 Asaphus are most approximate to those phyllopodous crus- 

 tacea of which Apus is the type, and that the genera Buce- 

 phalithus, Ogygia, and Paradoxides are analogous to such 

 phyllopodous genera as Branchipus, Eidimena, and Chiro- 

 cephalus. 



The works of Brongniart, above referred to, and that of J. 

 W. Dalman (Ueber die Palseaden oder die sogenannten Trilo- 

 biter, Nurnberg, 1828), and the works therein referred to, 

 must be consulted for the determination of the generic and 

 specific characters of these singular animals. 



