746 ME. r. K. C. EEED ON THE LOWER PALEOZOIC [NoV. 1 899, 



Remopleueides Poetloce:i, sp. nov. (PI. XLIX, fig. 4.) 



In the Geological Survey Collection at Dublin there are two 

 specimens (Nos. 1278 & 1455) labelled B. Colhii, which apparently 

 belong to a new species of the genus, distinct from any of those 

 hitherto described from British localities. One of the specimens 

 (No. 1278) is the cast of a head-shield without the free cheeks. 

 The glabella is large, flattened, transversely oval, twice as broad 

 across the middle as across the base, and produced in front into a 

 wide obtuse tongue of the same width as the base of the glabella, 

 and in length equal to about one-third that of the glabella. The 

 narrow eyes embrace the sides of the glabella, slightly indenting its 

 base on each side, and reaching from the neck-furrow to the 

 tongue. They decrease in width from the base forward, forming 

 only a very narrow band towards the front. 



The surface of the glabella is marked by two pairs of slightly 

 curved furrows directed obliquely backward. The anterior pair, 

 which is the stronger, is situated at about half the length of the 

 glabella, and neither pair reaches the axial furrows, each member 

 forming an isolated groove on the surface of the glabella, as in 

 R. radians, Barr. In addition to these furrows the whole surface 

 of the glabella is ornamented with fine transverse but slightly wavy 

 lines, not concentric with the margins, but roughly parallel to the 

 neck-furrow. The latter is well marked, and separates ofi" the 

 rounded neck-ring, which has precisely the same ornamentation. 



Measurements. 



mm. 



Length of head-shield 9 



„ glabella, including tongue . 7 



Width of glabella across the middle ... 9 



„ „ at the base 5 



„ tongue of glabella 6 



This species occurs in Stage 2 of the Tramore Limestone Series 

 of Tramore Bay. 



Affinities. — The presence of furrows separates this form at 

 once from all British species^ except R. radians^ Barr.^ and R. 

 Barrandii, Nich. & Eth.^ Prom R. radians it differs in the pre- 

 sence of only two pairs of furrows, in the width of the projecting 

 tongue of the glabella, and in the ornamentation. Prom R. Bar- 

 randii it diff'ers in the rounder shape of the glabella, the shorter 

 tongue, the longer eyes, the direction and position of the furrows, 

 and the ornamentation. The lineation of the glabella recalls some- 

 what that found in R. longicostatus, Portl. R. nanus, Leucht.* 

 shows a somewhat close resemblance in the shape and proportions 

 of the head-shield, but no ornamentation has been described in this 



^ Mem. Geol. Surv. dec. vii (1853) pi. viii, 



2 ' Syst. Silur. Boh.' 1852, vol. i (Trilob.) p. 359 & pi. xliii, figs. 33-39. 



3 ' Mon. Sil. Foss. Girv.' 1880, p. 151 & pi. x, figs. 13-16. 



* Schmidt, ' Eev. Ostbalt. Silur. Trilob.' pt. iv (1894) p. 88 & pi. vi, figs. 34- 

 35, and references. 



