108 



' Cheirurus insigens (Beyrich)" Billings. . 1866. Cat. Silur. Foss. Anticosti, p. 60., 



Ce7-aurus JViagarennn, Mall 1867. Twentieth Rep. Reg. X. Y. St. 



Cab. Nat. Hist., p. 376, pi. 21, fig. 10. 



Whiteaves 1884. This volume, pt. 1, p. 42. 



Probably a variety of Cheirurtm insiijnis, Beyrich, which, according to 

 Salter, Mon. British Trilobites, p. G3-, • is a synonym for G. himu- 

 croiiatxLK, Murchiaon, sp. 



Hespeler, T. C. Weston, 1867 ; the two specimens of the glabella re- 

 ferred to on page 42 of the first part of this volume. These and a small 

 cephalon from the Anticosti group at .the south west point of that island, 

 a large pygidium and imperfect glabella from the Niagara formation at 

 Grimsby, and six small specimens from rocks of about the same age at 

 Port Daniel in the Bale des Chaleurs, were identified many years ago by 

 Mr. E. Billings with Cheirurus insignis, Beyrich. A nearly perfect and 

 well preserved cast of the hypostoma of C. Kiagarensis was recently col- 

 lected by Mr. Townsend at Elora and is now in the Museum of 

 the Survey. 



Ill^nds Aboynensis. (N. Sp.) 



Plate 15, figs. 7 and 8. 



Cephalon broadly rounded in front, truncated behind, broader than 

 long, and broadest posteriorly, moderately convex, most prominent a little 

 in advance of its mid-length and somewhat flattened behind. Eyes of 

 medium size, moderately prominent, each situated at a distance of about 

 eight millimetres from the lateral and from the posterior margin ; dorsal 

 furrows indistinctly defined both posteriorly and centrally, but each fur- 

 row curves concavely forward and outward and terminates in a lather 

 large shallow depression or pit at a short distance from the anterior mar- 

 gin. Facial suture not clearly seen in the only specimen collected : 

 surface markings and characters of the genal angles unknown. 



Pygidium not at all three lobed, regularly convex, but flatter and 

 much more narrowly rounded than the cephalon. 



The few specimens collected are too imperfect to admit of very exact 

 measurements, but the cephalon and pj'gidium figured are both of the 

 natural size. 



Aboyne, near Elota, J. Townsend, 1892 : An imperfect cast of the 

 cephalon and casts of two detached pygidia. 



Although based upon rather imperfect material, this trilobite seems to 

 be quite distinct from any of the known species of IlUntus. Its most 

 salient character would appear to be the large depression at the anterior 

 end of each of the dorsal furrows upon the cephalon. 



