248 



TRILOBITA 



connected with the other suture by means of a transverse suture 



FIG. 150. A, Harpes ungula, Steriib., Ordovician. B, Ellipsocephalus hqffi, Scloth., 

 Cambrian. C, Olenus truncatus, Briinn., Cambrian. (After Angelin. ) D, Remo- 

 pleurides radians, Barr., Ordovician. E, Conocoryphe sulzeri, Barr., Cambrian. 

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

 x 1. H, Aeylina prisca, Barr., Ordovician, x 3. I, Phacops sternbergi, 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- 



