400 PBOCEEDINGS OP TlITl GEOLOGICAL SOCTICTY. [May 10, 



Head strongly marginate, semicircular, and with a Bmooth sur- 

 face ; angles produced into short spines, directed backwards. Gla- 

 bella parabolic and convex, and indented by three very distinct 

 lateral furrows which reach about one-third of the distance across. 

 Cheeks wider than the glabella, and raised. Eyes situated at 

 about one-third of the distance across from the glabella, and con- 

 nected with the glabella by very strongly marked ocular ridges. 

 The facial sutures run outwards and forwards above the eyes, 

 and backwards below the eyes to the posterior margin, a little to 

 the inner side of the spinous angles. Thorax consisting of four- 

 teen segments ; the axis is convex and tapers gradually towards the 

 tail. Pleurae less than half as long again as the rings of the axis, 

 grooved deeply, and bent backwards from the fulcrum, which is 

 situated about midway. Tail semicircular, with a tapering, strongly 

 raised axis of four segments ; limb marked with four distinct ribs. 

 This species approaches nearer to C. cqipJanata than to any other 

 Cambrian species, but is of larger size, has the eyes placed much 

 nearer the glabella, has shorter pleurae, and a more strongly ribbed 

 tail. 



Locality. — A headland near Kun's Well, St. David's. 



CoNocoKYPHE soLVENsis, Hicks. PI, XYI. fig. 8. 



The head and a few thoracic segments only have been found ; but 

 these are sufficient to mark a new species, resembling in some respects 

 the Bohemian species C. coronata. The head is semicircular, tuber- 

 cular all over, and strongly marginate. Glabella small, reaching 

 less than two thirds of the distance forwards, narrow anteriorly, and 

 indented by three lateral furrows. A strongly raised boss occupies 

 the place anterior to the glabella, and reaches from it to the margin, 

 but is separated at the base from the glabella by a deep furrow. 

 Cheeks more strongly convex than the glabella, and about twice 

 as wide ; the cheeks are wider than in C coronata ; and it seems 

 altogether a wider form. 



Locality. — Eoad-side between Solva and Whitchurch, St. David's. 



MicKODiscTJS scuLPTTJS, Hicks. PI. XVI. figs. 9 and 10. 



Differs from MicrocUscus punctatus, the only other species found 

 in Britain, by having the lobes of the tail distinctly ribbed and not 

 punctated ; is about equal to it in size. 



Locality. — Headland near Nun's Well, St. David's. 



Agnostus cambrensis, Hicks. PL XVI. figs. 11 and 12. 



About one fourth of an inch long, and convex. Head longer than 

 wide, and straight on the sides. Glabella occupying more than a third 

 of the width, and divided at its anterior third by a transverse 

 furrow. Tail nearly of the same shape as the head, with a wide 

 axis centrally raised and indented by three furrows on each side. 



Locality. — Headland near Nun's Well, St. David's. 



Theca antiota. Hicks. PI, XVI. fig. 13. 



About f of an inch long ; surface not corrugated, and extremity 



