Vol. 65.] ROCKS OF THE TOURMAKEADY DISTRICT. 149 



continuation of the lateral border, but is angularly ridged along 

 its length ; the tip is broken, but the spine is at least three-fourths 

 of the length of the whole cheek. The facial suture has its anterior 

 branch poorly shown, but it seems to arch strongly inwards and 

 slightly backwards to the eye, which it meets at nearly a right 

 angle ; the posterior branch bends out behind the eye, curving 

 back rather steeply to cut the posterior margin of the head-shield 

 at about 60° and about half way between the base of the eye and 

 the lateral edge of the cheek. 



The generic reference of this solitary free cheek is somewhat 

 doubtful, but it much resembles in convexity and shape, position 

 and size of eye, and genal spine, the trilobite from the Trenton 

 Limestone described as Bathi/urus extans (Hall), 1 and chosen by 

 Billings as the type of that genus. It cannot be referred to 

 Asaphus or to any of its subgenera, but in many respects it recalls 

 some species of Proetus. Most of all it resembles the free cheek of 

 some species of Apatocephalus, if we accept Prof. BroggerV~ 

 reference of Salter's species Conocoryphe invito, to this genus. A 

 species of Apatocephalus has been described by me 3 from the 

 Tramore Limestone of County Waterford. 



Telephus hiberntctts, sp. nov. (PI. VI, figs. 10 & 11.) 



Several small detached head-shields of a trilobite, with the peculiar 

 characters of Telephus, occur in the crystalline reddish limestone 

 (58) exposed west of Gortbunacullin Farm bridge. None are very 

 well preserved; but, by piecing together the evidence from the 

 different specimens, the following description can be given. 



Head-shield transverse, more than twice as wide as long. 

 Glabella broadly semioval to subquadrate, nearly as wide as long, 

 narrowing a little anteriorly, strongly convex, rounded in front. 

 Occipital furrow slightly arched forward in the middle or straight ; 

 occipital segment simple. Axial furrows sharp, moderately strong, 

 slightly convergent anteriorly. Cheeks much lower and less 

 convex than the glabella, almost horizontally extended or slightly 

 arched down on each side, of rounded or subtriangular shape, nearly 

 as broad as long, surrounded by a flattened border, which broadens 

 gradually to the middle, then decreases in width until it merges 

 into the narrow anterior border in front of the glabella. Marginal 

 furrow sharp, but not deeply impressed. Glabella and cheeks 

 minutely tuberculated. 



Dimensions. — Length = about 3-0 millimetres; width = about 

 6*5 mm. 



Remarks. — This species seems almost indistinguishable from 



1 J. Hall, ' Paljeont. N.Y.' vol. i (1847) p. 228 & pi. lx, figs. 2-2 a ; E. Billings, 

 ' Geol. Canada ' (Geol. Surv. Cana'da) 1863, p. 153 & fig. 114. 



2 W. C. Broggei-, ' Verbreit. cler Euloma-Niobe Fauna in Buropa' Nyt Mag. f. 

 Natuvvidensk. vol. xxxvi (1898) pp. 175, 184, & 202. 



3 ¥. R. C. Reed, Quart. Journ. Geol. Soc. vol. lv (1899) p. 758 & pi. xlix, 

 figs. 14-16 (Tramoria punctata) ; see also Geol. Mag. dec. iv, vol. vii (1900) 

 p. 46. 



