62 



Silurian Fossils of Canada^ 



the posterior portion of the glabella by strong deep furrows 

 directed obliquely forward and outward. The distance between 

 the inner extremities of these furrows is about 1^ lines in a speci- 

 men 1 J inches in length. The second and third lobes are united 

 into one large obliquely triangular lobe with a small transverse 

 pit at the inner margin representing the second furrow. The 

 fourth or posterior pair of lobes are obscurely preserved in the 

 specimens, but they appear to be small. The neck furrow seems 

 to be strongly marked quite across the base of the glabella and 

 the neck segment rather prominent. The eyes as partly exhibited 

 in one of the specimens are rather small, their diameter being 

 one line or perhaps rather more. They appear to be distant a 

 little more than their own length from the posterior margin of 

 the head. 



Fig-. 8. — Dalmanites Behryx. 



The segments of the thorax are not well preserved in the spe- 

 cimens, but there appear to be eleven. The axis when crushed 

 flat four lines wide at the fifth segment and three lines at the last. 



The pygidium is triangular ; the middle lobe convex, elongate 

 conical, and with from fifteen to twenty segments becoming 

 gradually more numerous in a given space as they approach the 

 posterior extremity. The side lobes have each about ten pleurss 

 all of which are distinctly grooved along the middle. The pygi- 

 dium appears to terminate in a rounded point a little turned 

 upwards. I have not seen the margin of the pygidium and have 

 not therefore ascertained its characters. 



From the appearance of the specimens I think it almost certain 

 that the posterior angles of the head are produced into short 

 spines. 



