130 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



suddenly bends at the junction of the terminal third, still dimi- 

 nishing 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 coE:;fTJCoriA, Salter. PL YII. figs. 12 & 13. 



A curved shell, sufficiently distinct from any other fossil found n 

 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 g of an inch in length and about -^j^ of an inch in 

 width at the upper part. 



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



Theca pentjltima. Hicks. PL YII. figs. 15 & 16. 



This species differs from the other species in the Menevian group 

 in having strongly marked lines of grovrth, 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 k 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. 



Pkotocystites mejn^eveksis, Hicks. PL Y. 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 

 sb^.wn. 



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 Tablso 

 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 theorj' of colonies propounded 

 by the eminent palaeontologist M. Barrandc ; but several very inter- 

 esting 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 scries. The Sponges come 



