Plate 36 



This plate contains a few figures of various genera of trilobites 

 with median eye tubercles. 



Isoteloides homalonotoides (Walcott) 



1 Cephalon showing median eye tubercle. (From Raymond) 

 Ordovician : Black River beds, Pattersonville, N. Y. 



Symphysurus convexus (Cleland) 



2 Cranidium showing median eye tubercle. (From Raymond) 

 Ordovician : Beekmantown limestone. Columbia, N. J. 



Basilicus kegelensis Schmidt 



3 Partly exfoliated cephalon with median eye tubercle showing 



pit. (From Schmidt) 

 Ordovician: Kegel beds D 2 , Kegel, Russia. 



Symphysurus angustatus Sars & Boeck 



4 Exfoliated cephalon with median eye tubercle. (From Moberg 



& Segerberg) 

 Ordovician : Orthoceras limestone. Fogelsang, Sweden. 



Asaphellus monticola Raymond 



5 Cranidium with distinct median eye tubercle. (From Raymond) 

 Tremadoc: Montagne Noire, Herault, France. 



Asaphus ludibundus mut. jewensis Schmidt 



6 Exfoliated glabella with median eye tubercle and pit. (From 



Schmidt) 

 Ordovician : Jewe beds D 1; St Mathias, Esthonia, Russia. 



Hemigyraspis collieana Raymond 



7 Imperfect cranidium with distinct median eye tubercle. (From 



Raymond) 

 Ordovician : Beekmantown beds. Bellefonte, Pa. 



