NATURAL CLASSIFICATION OF THE TRILOBITES 161 



Harpides Beyrich. 

 Harpina Novak. 

 Harttia Walcott. 

 Hausmannia Hall and 



Clarke. 



JSemisphcerocoryphe Reed. 

 Holasaphus Matthew. 

 Holmia Matthew. 

 Holocephalina S alter. 

 Holometopus Angelin. 

 Homalonotus Koenig. 

 Homalopecten IS alter. 

 Homalops Remele and 



Dames. 



Homolichas Schmidt. 

 Hoplolichas Dames. 

 Hydrocephalus Barrande. 

 Hydrolenus Salter. 

 Illcenopsis Salter. 

 Illcenurus Hall. 

 Illcenus Dalman. 

 Isocolus Angelin. 

 Isotelus De Kay. 

 Koenigia Salter. 

 Leiolichas Schmidt. 

 Leptoplastus Angelin. 

 Liclias Dalman. 

 Liostracus Angelin. 

 Loganellus Devine. 

 Lonchodomus Angelin. 

 Mer/alaspides Brogger. 

 Megalaspis Angelin. 

 Menocephalus Owen. 

 Mesonads Walcott. 

 Metopias Eichwald. 

 Micmacca Matthew. 

 Microdiscus Emmons. 

 Monorachos Schmidt. 

 Neseuretus Hicks. 

 NieszkowsJcia Schmidt. 

 Nileus Dalman. 

 Niobe Angelin. 



