Page:Quarterly Journal of the Geological Society of London, vol. 28.djvu/218

 Erinnys, having, indeed, a somewhat intermediate character. From 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. Carausia 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. — Menevian group : Porth-y-rhaw, St. David's.

HOLOCEPHALINA INFLATA, spec. nov. Pl. VI. figs. 8-10.

Ovate in form, and surface well raised. Length about l/2 inch, width about 1/4 inch. The head is nearly semicircular in form, highly convex, and punctated all over. The glabella is small, and indistinctly marked off from the cheeks by faint 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 Holocephalina 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.

CONOCORYPHE HOMFRAYI, Salter. Pl. VI. fig. 12.

Length about 3-1/4 inches, breadth 1-1/2 inch. Form ovate. Head semicircular, marginate, and produced posteriorly at the angles into short thick spines. Glabella parabolic, slightly convex, and showing two pairs of rather indistinct furrows. It occupies 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 narrower than the lateral lobes, slightly convex, and tapering gradually towards the tail. The pleurae 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, North Wales.

CONOCORYPHEE CORONATA, Barr. (Conocephalites coronatus). Pl. VI. fig. 11.

This specimen was discovered by Mr. Homfray in the same beds with the former species, in the Waterfall Valley, 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.