SALTEE AND HICKS irBNEVIAIT FOSSILS. 55 



Head semicircular, very slightly angular in front, where it has a 

 distinct but narrow margin. The margin is much wider on the 

 sides, also towards the base of the free cheeks, and is there produced 

 into rather short thick spines. 



Glabella large and broad, subpentagonal, wider than the cheeks, 

 nearly attaining the margin in front, not reaching beyond it, as in 

 F. HicTcsii, next described. It is furnished with five distinct pairs of 

 lateral furrows, besides the neck-furrow ; the two lower pairs reach 

 directly across, the next two pairs are almost equally strong with the 

 lower ones, but reach only about a third of the distance across ; the 

 anterior pair are short, and curve backwards at their inner extremi- 

 ties, and are situated somewhat in advance of the outer angles of the 

 glabella. Eyes large, approximating the glabella at their upper 

 part ; upper edge on a line with the outer angles of the glabella, 

 and with the fourth pair of furrows. 



The glabella is unusually large in this species ; and though it is 

 angular at the apex, the angle is much more obtuse than in P. 

 Biclcsii, and is always bounded in front by the narrow margin. 

 The neck also is much wider than that of P. Hicksii. — J. W. S. 



Locality, grey beds at the base of the " Menevian Group," Porth- 

 y-rhaw and vicinity, St. David's. 



5. Paeadoxldes Hicksii, Salter, PL III. figs. 1-10. Brit. Assoc. Eep. 

 1865, p. 285. 



Apparently a very flat species ; its length is from 3 to 4 inches ; the 

 breadth half the width; the general form broad-ovate, but with 

 nearly straight sides; the short spines not interfering with the 

 general shape. 



Head sub triangular, produced in front, and terminating posteriorly 

 in very short spines, which do not reach backwards half the length 

 of the thorax (they are unusually short in the specimen figured in 

 Plate III. fig. 2). Glabella very flat, and but httle raised above the 

 cheeks ; it is unusually long, reaching even to some distance in 

 advance of the front margin, pear-shaped, attaining its greatest 

 width about the anterior third, where it is wider than the cheeks. 

 Thence it tapers forwards to the obtusely pointed front, and back- 

 wards, with straight sides, to the narrow neck segment, which is 

 only one-fourth the width of the head. 



Pour distinct short furrows indent each side of the glabella, equally 

 strong with the neck-furrow ; and the lobes thus marked out are of 

 equal size. Some specimens show traces of a fifth pair anterior to 

 these, which bend back at their extremities towards the next pair. 

 These, however, are generally very indistinct. ITone of the glabella- 

 furrows extend quite across *, but leave a somewhat elevated space 

 down the middle of the glabella ; nor do they quite reach the axial 

 furrows, which are well marked. 



The eyes are about halfway up the head, and occupy about half 

 the length of the cheeks; they are gently curved downwards and 



^" Except the basal ones in the young state (fig. 9). 



