On the Ventriculitidce of the Cambridge Upper Greensand. 461 



of Whitesand Bay, and over a considerable tract of country about 

 5 miles east of St. David's. They rest conformably on the Lingula- 

 flags, and are about 1000 feet thick in Eamsey Island. The author 

 noticed the fossils found in these deposits, nearly all of which are of 

 new species, and stated that the palaeontological evidence proves these 

 rocks to be nearly allied to, if not identical with, the lower part of 

 the Tremadoc rocks of North Wales. The Upper Tremadoc rocks of 

 Worth Wales seem to be represented at St. David's by the so-called 

 Arenig rocks which overlie the deposits described in the present 

 paper. The new species described by the author are as follows : — 



Neseuretus (g. n. Trilob.) ramseyensis, quadratus, recurvatus, 



and elongatus. 

 Niobe menapice and solvensis. 

 Theca Davidii. 



Bellerophon ramseyensis and solvensis. 

 Palasterina ramseyensis. 

 Dendrocrinus cambrensis. 

 Cienodonta menapiensis and cambrensis. 

 Palcearca Hophinsoni and oboloidea. 

 Glyptarca (g. n.) primceva and Lobleyi. 

 Davidia (g. n.) ornata and plana. \ 

 Modiolopsis ramseyensis, Homfrayi, solvensis, and cambrensis. 



He also noticed the occurrence in the" deposit of Lingulella Davisii, 

 M'Coy, Lingula petalon, Hicks, Obolella plicata, Hicks, Orthis 

 Carausii, Salt., and menapice, Hicks, and Eophyton explanatus, 

 Hicks. 



2. " On the Phosphatic Nodules of the Cretaceous Rock of Cam- 

 bridgeshire." By the Rev. 0. Fisher, M. A., F.G.S. 



The author stated that this paper was founded upon one read by 

 him before the Society in May last, but subsequently withdrawn, in 

 consequence of his obtaining information which necessitated a change 

 of opinion upon certain points. The new portion related chiefly to 

 those nodules which had been regarded as belonging to Porospongia 

 or Scyphia, the fenestrated structure shown in sections of which the 

 author now identified with the structure of Ventriculites, as de- 

 scribed by Mr. Toulmin Smith, the whole arrangement, and espe- 

 cially the presence of an octahedral figure at the nodes where the 

 fibres of the framework intersect one another, being in favour of 

 this determination. The author described the peculiarities of these 

 octahedra, and dwelt particularly upon the *fact that these sections 

 of phosphatic nodules showed clearly that the fibres are really tubular, 

 and not, as Toulmin Smith supposed, solid. 



3. " On the Yentriculitidae of the Cambridge Upper Greensand." 

 By W. Johnson Sollas, Esq., Associate of the Royal School of Mines, 

 London. 



A collection of supposed sponges found in the Cambridge Upper 



