750 MR. p. K. C. EEED Olf THE LOWER PALAEOZOIC [NoV. 1 899, 



I am doubtful whether it occurs at IS'ewtown Head, but it is 

 abundant at Newtown Cove, and is also found at Dunabrattin in 

 Stage 3 of the Tramore Limestone Series. 



Phacops tettncato-catjdattjs, Portlock. 



Rare ; occurs in Stages 2 & 3 of the Tramore Limestone Series. 



Salter ^ records it only from Tyrone, but I have found it myself at 

 Tramore and inland, and there are specimens of it in the Survey 

 Collections in Dublin. It belongs to the subgenus Pterygometoious^ 

 but shows certain features linking it rather closely to Chasmops.^ 



Phacops Bailti, Salter. 



Salter (op. cit. p. 44) described this species from the ' Caradoc 

 Slates of Tramore.' It is a typical Pterygometopus, comparable with 

 Ph. sclerops, Dalm. and other allied forms from the Orthoceras- 

 limestone of Hussia and Scandinavia. 



Galymene brevicapitata, Portlock. 



In Stage 2 of the Tramore Limestones this species is the common 

 Calymene. It also occurs associated with Q. Blumenbachi var. 

 Caractaci in Stage 3. Salter's ^ views on the synonymy of C. hrevi- 

 capitata do not commend themselves to me. The head-shield 

 certainly agrees in many respects with O. senaria, Conrad, but in 

 the indistinct and indefinitely defined anterior pair of glabellar lobes 

 it more closely resembles 0. camhrensis, Salter. The rounded and 

 elevated border to the front of the head-shield, however, distin- 

 guishes it from the latter. The pygidium differs from both these 

 species in possessing only four rings on the axis, of which the 

 posterior one is very faint, and in having only four grooved pleurae 

 on the lateral portions. The short broad shape of the axis also 

 distinguishes it from C. cambrensis. 



Our Tramore form is almost identical with Salter's fig. 5, pi. ix, 

 which he says is C. hrevicajoitata, Portl. in part. The whole head- 

 shield, thorax, and pygidium are ornamented with fine tuberculations. 

 There is no doubt in my mind that this form is distinct from 

 O. senaria, Conr."^ as defined by Salter, and also from 0. hrevi- 

 cap)itata, Portl. as described by M'Coy,'' whose type-specimen 

 Salter rightly attributes to 0. cambrensis. 



Cxbele teamorensis, Reed. (PI. XLIX, fig. 6.) 



This species, which has been previously described by the present 

 author,'' was founded on an imperfect head-shield. But there is a 

 specimen from Stage 2 of the Tramore Limestone Series of Tramore 

 in the Dublin Museum which shows also a well-preserved fixed 



1 Monogr. Palasont. Soc. ' Brit. Trilob.' 1864, p. 44. 



2 Schmidt, ' Eev. Ostbalt. Silur. Trilob.' pt i (1881) p. 63. 



3 Monogr. Palaaont. Soc. ' Brit. Trilob.' pp. 96-99 & pi. ix, figs. 5-7. 



4 Pompeckj, Neues Jahrb. 1898, vol. i, p. 200. 



■5 ' Brit. Pal. Foss.' 1855, p. 165 & pi. i F, figs. 4 & 5. 

 e Geol. Mag. 1895, p. 49. 



