suddenly bends at the junction of the terminal third, still diminishing in size, and at last attaining to a sharply pointed apex. A longitudinal ridge extends along the surface of the sides near the centre ; but the surface otherwise is tolerably smooth. The mouth is somewhat funnel-shaped, but with one lip greatly elongated. The shell itself, which is to a certain extent preserved, seems to have much of the same texture as that of a Lingula.
Locality. — Menevian group : St. David's.
Stenotheca cornucopia, Salter. Pl. VII. figs. 12 & 13.
A curved shell, sufficiently distinct from any other fossil found in the Menevian group to indicate a new and interesting genus. A small and wide form, with the lines of growth strongly marked on its surface. About 1/8 of an inch in length and about 1/15 of an inch in width at the upper part.
Locality. — Menevian group : St, David's.
Theca penultima. Hicks. Pl. VII. figs. 15 & 16.
This species differs from the other species in the Menevian group in having strongly marked lines of growth, which are always straight and not curved forwards as in Theca corrugata, and also in having one wide and tolerably strongly raised longitudinal ridge running along the surface of its sides.
Locality. — Menevian group : St. David's.
Theca stiletto, Hicks. Pl. VI. figs. 18 & 19.
This species is of smaller size than the other two in the Menevian group ; it has also a smooth surface, with no indications of the lines of growth visible. It tapers also much more suddenly, and attains a sharper point than either of the others.
Locality. — Menevian group : St. David's.
Protocystites menevensis, Hicks. Pl. V. fig. 19.
At present very little is known of this species ; but to complete the fauna of the Menevian group, so far as it is discovered, these fragments are now figured. An arm and some indistinct plates are shown.
Locality. — Menevian group : St. David's.
During my researches at St. David's I have, from time to time, endeavoured to note the range of the genera and species as they were discovered ; and the results have been given in the several Tablse published in the ' Journal ' of the Geological Society and in the British Association Reports. I have not, however, been able to obtain much evidence by this means to support the theory of colonies propounded by the eminent palaeontologist M. Barrande ; but several very interesting facts have been noted, which it might be well again to refer to. The Brachiopods here, as in other formations, have a greater range than any of the other fossils, the same species extending in some cases through the whole Cambrian series. The Sponges come
