TRILOBITA—OPISTHOPARIA. 



265 



24. E. grandis Matthew. (Fig. 1557, a-c.) Cambric. 



Sides of glabella concave ; each ring of the thoracic axis marked 



Fig. 1556,^. Holi/iia bj-dggeriyhy^^osiomo. 2ind 6iO\xh]\xrt. (After Matthew. ) 



with a median groove ; surface of test covered with minute shallow 

 pits. 



Middle Cambric of St. John group (Protolenus bed) of New 

 Brunswick. 



25. E. galeatus Matthew. (Fig. 1557, J-/.) 



Cambric. 



Fig. 1557. a-c, Ellipsocephalus grandis, cephalon and a thoracic segment; d-f, E. 

 galeatus : e, section of thorax ; y, side view of cephalon ; g, hy Protolenus paradoxoides ; 

 i,j\ P. {Bergeronia) articephalus ; k-m, P. [Bergeronia) elegans. (After Matthew.) 

 The markers are all % nat. size. 



Very convex; surface minutely granular; thoracic rings as in 

 E. grandis. Sides of glabella nearly straight. 



Middle Cambric of St. John group (Protolenus bed) of New 

 Brunswick. 



XIV. Protolenus Matthew. 



Cephalon semicircular, convex, with genal spines, and bordered 

 by a distinct fold. Glabella cylindro-conical, marked by furrows 



