413 

 CHEIRURUS APOLLO. (N. sp.) 



Fig. 397. 



Description. Head convex, semicircular, width about twice the length 

 or a little more. Glabella depressed, convex, somewhat circular or very 

 broadly conical, the posterior margin convex, the sides and front rounded, 

 the width at the posterior third equal to the length, the neck furrow in the 

 cast defined all across three glabellar furrows directed obliquely forwards 

 and outwards at an angle of about 30, with the longtitudinal axis their 

 inner extremities turned backwards, and distant from each other about 

 one-fourth the whole width. The four side lobes of the glabella are sub- 



Fig. 397. Fig. 398. Fig. 399. 



Fig. 397. Cheirurus Apollo. 



Fig. ZSS. Pygidium. Limestone No. 2. This may be the tail of an Amphion* 



Fig. 399. Cheirurus Eryx. 



equal, the posterior pair a little larger than the others. Eyes small, 

 opposite the second lobe from behind, distant from it about the width of 

 the lobe or a little less. Cheeks in the cast punctured. I have not 

 ascertained whether or not the posterior angles terminate in spines. 

 Length of head, five lines ; length and width of glabella, a little less than 

 five lines. 



There are many European species of this type, and they range from the 

 Landeilo Flags upwards to the Devonian. 



Limestone, No. 2. 



CHEIRURUS ERYX. (N. sp.) 



Fig. 399. 



Description. Head semicircular, depressed convex, width twice the 

 length or a little more, the posterior angles produced into short spines. 

 Glabella elongate conical, moderately convex, rounded in front, sides 



* This pygidium is figured in the Geology of Canada, p. 239, provisionally under the 

 name of Amphion Cayleyi. It may, however, possibly belong to one of the species of 

 Cheirurus above figured, perhaps to C. Apollo. 



