178 PROCEEDINGS OE THE GEOLOGICAL SOCIETY. 



Erinnys, having, indeed, a somewliat intermediate character. Prom 

 the former, however, it differs in having a large and well-marked 

 glabella, and a veined instead of a punctated surface to the cheeks, 

 and in the larger number of thoracic segments ; from the latter in 

 having long head-spines, a shorter glabella, a smaller number of 

 segments to the body, and short spines to the hindmost pleurae. 



Cakaitsia menevensis, sp. nov. PL VI. fig. 7. 



The characters of the species are those of the genus, as only 

 one species is known at present. 

 Locality. — Meneviau group : Porth-y-rhaw, St. David's. 



HoLOCEPHALiisrA INELAXA, spec. nov. PI. VI. figs. 8-10. 



Ovate in form, and surface well raised. Length about l inch, 

 width about | inch. The head is nearly semicircular in form, 

 highly convex, and punctated all over. The glabella is small, and 

 indistinctly marked oft' from the cheeks by taint lateral furrows. 

 A strong nuchal spine extends some distance backwards. There is 

 no appearance of the wide head-margin, nor of the strong angular 

 spines of HolocepJiaUna primordialis. The body appears to have 

 consisted of not more than ten rings. The pygidium is semicircular, 

 with a strongly raised axis of three segments ; and the lateral lobes 

 bear three ribs, strongly raised, almost spinous, near the margin. 



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



CoKocoETPHE HoMEEATi, Salter. PI. VI. fig. 12. 



Length about 3| inches, breadth 1^ inch. Perm ovate. Head 

 semicircular, marginate, and produced posteriorly at the angles into 

 short thick spines. Glabella parabolic, slightly convex, and show- 

 ing two pairs of rather indistinct furrows. It occi;pies about a fourth 

 of the width and two thirds of the length of the head. The cheeks 

 are less convex than the glabella, and their surface is smooth. The 

 eyes are small, and situated near the glabella, but unusually far 

 backwards towards the neck-furrow. 



The thorax consists of 14 rings. The axis is considerably nar- 

 rower than the lateral lobes, slightly convex, and tapering gradually 

 towards the tail. The pleurse are long and deeply grooved, and with 

 the fulcrum situated about midway in the length. 



The tail is semicircular, and bounded by a margin. The axis is 

 raised and composed of two segments. The lateral lobes are marked 

 by a pair of ribs on each side. 



Locality. — Found by Mr. D. Homfray, of Portmadoc, in Menevian 

 beds of the Waterfall Valley, near Maentwrog, Forth Wales. 



CoNOCOETPHE coEONATA, Barr. (GonocepJialites coronatus). PI. VI. 

 fig. 11. 



This specimen was discovered by Mr. Homfray in the same beds 

 with the former species, in the Waterfall VaUey, near Maentwrog. 

 It is the only Bohemian species yet found in the Menevian group, and 

 is therefore interesting as forming a link between the two faunas. It is 

 perhaps rather smaller in size than the specimens figured by Barrande, 

 but in all other respects it appears to be identical with his species. 



