Vol. S5-] 



BEDDED KOCE:s OF COTJNTY WATEKFORD. 



745 



the point. The obscure fulcrum is situated where the pleura bend& 

 sharply back to end in the short point. A narrow articulating 

 band runs along the anterior and posterior edges of each pleura. 



The pygidium is about three times as broad as long, with a short 

 conical axis nearly reaching the posterior margin and marked with 

 six rings, the grooves that separate them being strongest and deepest 

 at the sides. The pleural portions are flat, and show only one or 

 two faint furrows. 



Measurements. 



mm. 

 Total length of trilobite from front of fringe to extremity of pygidium . 15'5 



Length of the genal spines behind the pygidium 12-0 



Total length of the genal spine from the genal angle 16"0 



Length of head 7*0 



„ thorax 5*5 



,, pygidium 30 



Width of thorax lO'O 



,, axis 2'5 



Ampyx cf. YoLBORTHi, Schmidt. 



The species of Ampyx which occurs most frequently in Stage 3 

 of the Tramore Limestone Series at Newtown Cove is distinct from 

 A» mammillatiis, and does not seem referable to A. costatus. It 

 approaches most closely that named by Schmidt^ A. VolbortJii from 

 Stages B2 & B-s, in Eussia. Our specimens are not, however, sufficiently 

 perfect to admit of a close comparison. The head-shields most 

 resemble Schmidt's fig. 12, pi. vi; and the pygidia, fig. 17, pi. vi. 

 It is a large form, one of the head-shields (without the spine) 

 measuring 18 mm. in length. 



Haepes Flanagani, Portlock. 



The single specimen of this species from the Waterford area is in 

 the Dublin Museum. It comes from Newtown Head, and consists of 

 a nearly perfect cast of the under-surface of a head-shield. With 

 the exception of the coarser nature and irregular distribution of the 

 pores in the limb, it shows a close resemblance to the Russian 

 species R. SpassHi (Eichwald)^ from the Echinosphserite-limestone 

 Ci. The linear arrangement of the pores, described by Schmidt^ a& 

 existing on the limb of this foreign form, is not observable, but on 

 the cheeks the fine raised radiating lines with rows of pores between 

 them are fairly distinct. Portlock's^ figures and description of 

 E. Flanagani lack detail, but the description which Schmidt gives of 

 the glabella, cheeks, position of eyes, etc. in II. Spasskii would apply 

 without much modification to the Irish species. 



1 'Eev. Ostbalt. Silur. Trilob.' pt. iv, Mem. Acad. Imp. Sci. St. Petersb 

 ser. 7, vol. xHi (1894) no. 5, p. 80 & pi. vi, figs. 11-20. 



2 Eichwald, ' Sil. Schichtensystem v. Estland,' 1840, p. 86 ; and ' Leth 

 Boss.' 1860, p. 1375 & pi. hi, fig. 27. 



3 ' Eev. Ostbalt. Silur. Trilob.' pt. iv, p. 66 & pi. v, figs. 3-9. 

 * * Eep. Geol. Londond.' 1843, p. 268 & pi. v, figa. 5-7. 



Q.J.G.S. No. 220. 



3c 



