248 



TRILOBITA 



connected with the other suture by means of a transverse suture 



Fig. 160. — A, Harpes ungula, Sterub., Ordovician. B, Ellipsocephalus kqffi, Sclotli., 

 Camljrian. C, Olemis tricncatas, Briinu., Cambrian. (After Angelin. ) D, Remo- 

 plmrkles radians, Barr., Ordovician. E, Ccmocoryphe sulzeri, Barr., Cambrian. 

 F, Illaenus dalmanni, Volb., Ordovician. G, Proetus iohemicus, Corda, Silurian, 

 X 1^. H, Aeyllna prisca, Barr., Ordovician, x 3. I, Phacops steritbergi, Barr., 

 Devonian. (A, D, E, G, H, I, after Barrande ; B, F, from Zittel ; natural size 

 except G, H.) 



(Fig. 137, B, D). The eyes are rather small. The thorax con- 



