nrCKS — MENEYIAN FOSSILS. 179 



An-opolextjs niPAE, nov. sp. PI. YII. figs. 1-7. 



In none of the specimens found were the free cheeks attached 

 to the head; but the position of the sutures indicates that, when pre- 

 sent, the head must have been semicircular in form, with two 

 tolerably long spines reaching backwards from the posterior angles. 

 The glabella reaches to the margin in front, is rounded anteriorly, 

 and is widest at the base of the frontal lobes. It occupies more than 

 a third of the width of the head, and is raised somewhat above the 

 level of the cheeks, from which it is separated by tolerably deep lateral 

 furroAVS. It is grooved by one complete and two incomplete lateral 

 furrows, and one pair of small anterior furrows. The hinder furrow 

 and the neck-furrow are strong and remote from one another. The 

 inner cheeks are narrow, and bounded on the outside along their 

 whole length by the eye-lobe, which is wide and flexuous, and on 

 the inner side for the lower two thirds by the cheek-lobes, which are 

 well marked in some of the specimens, The outer cheeks are nar- 

 row, and have long posterior spines attached. The thorax consists 

 of 14 segments ; axis wide and taperiug. The anterior pleurae are 

 shorter than the rings of the axis, and are scarcely, if at all, spinous 

 at the ends. The three hindmost pleurae, however, have very long 

 spines, which bend backwards, and reach on each side beyond the 

 extremity of the pygidium. 



The tail consists of a wide, raised and taperiug axis of four or five 

 segments, extending nearly to the posterior margin, and of a fur- 

 rowed, strongly margined limb, serrated on the outer edge. This 

 species is distinguished from Anopolenus Salteri by having wide, 

 flexuous eye-lobes, very narrow inner cheeks, a rounder anterior 

 border to the glabella, wider axis to the thorax, and a stronger and 

 longer axis to the tail. Its narrow inner cheeks and wide flexuous 

 eyes distinguish it also from Anopolenus Henrici. 



Locality. — Menevian group : St. David's ; and Maentwrog, North 

 Wales. 



Anopolenus Salteei, Hicks. PI. YII. figs. 8-11. 

 Quart. Journ. Geol. Soc. vol. xxi. p. 478. 



In the Quart. Journ. Geol. Soc. vol. xxi. a detailed description of 

 this species is given, along with a restored figure compiled from the 

 fragments then discovered. Since then, however, other and more 

 perfect specimens have been found, which show that, though for the 

 most part the figure there given is correct, yet a few points need 

 alteration. The specimens now figured indicate that the glabella was 

 narrower, and tapered sharply anteriorly — that the free cheeks were 

 not cut ofi' abruptly, but continued in a line with the posterior 

 margin, as in A. impar — and that the axis of the tail was longer. 



Locality. — Menevian group : St. David's. 



CyBTOTEECA HAMULA, Hicks. PI. VII. fig. 14. 



A curved Pteropodous shell, nearly i inch long and i of an inch 

 wide at the upper part, and gradually tapering backwards. It 



