27 



and west coasts of the island ; H. R, Also at Gamache Bay, in Div. 1, 

 A. G. Both the pygidium and the head are proportionally more elon- 

 gated than is represented in Locke's figure, but the eye occupies the same 

 position. The margin has a concave depression all round just inside of 

 the edge ; the latter is bevelled. The central portion of the head is punc- 

 tate, but a space around the margin is covered with fissure-like stride. 

 There are fragments which indicate a length of two feet. 



Genus Ill^nus, Dalman. 



I. ORBICAUDATUS, B., Can. Nat. Geol., iv, p. 379. This species was 

 found by T. C. Weston in 1865 at English Head ; H. R. It occurs also at 

 Gamache Bay and S. W. Point ; Divs. 1 and 4, A. G. A specimen with 

 the head, thorax, and pygidium in connection, but a good deal worn, was 

 collected by Weston at Gamache Bay. It is figured below. 



I. GRANDis, B., Can. Nat. Geol., iv, p. 380. Charleton Point ; H. R. 

 Also at Gamache Bay and S. W. Point ; Divs. 1 and 4, A. G. 



Genus Dalmanites, Emmrich. 



D. CALLicEPHALUS, Hall. — C9iarleton Point, English Head and West- 

 end ; H. R. 



Genus Cheirurus, Bey rich. 



C. PLEUREXANTHEMUS, Green. — Occurs at numerous localities on the 

 north and west coasts ; H. R. Also at Gamache Bay ; Div. 1, A. G. 



C. Icarus, B., Can. Nat. Geol., v. 67. Charleton Point, English 

 Head, and Macasty Bay ; H. R. 



Fig. 10. Fig. 11. 



Fig. 10. — Ilkenus orbicaudatus — A specimen from English Head. 

 Fig. 11. — Cheirurus Numitor. — Part of the head of this species. 



C. Numitor, n. sp. — Glabella (that portion of it in front of the neck- 

 furrow) sub-circular or sub-quadrate, the front somewhat straight or 

 gently convex ; the front angles narrowly rounded ; sides broadly rounded, 

 the greatest width about the mid-length. There are three pairs of glabel- 

 lar furrows all deeply impressed but not extending inwards more than one- 



