524 



PEOCEEDLN-GS OF THE GEOLOGICAL SOCIETY. 



the conglomeratic character of the bed ; and if anything could be 

 decided regarding the comparative age of remains found in the same 

 section and in the same deposit, I should say they were slightly 

 younger than some of the bivalves with which they are associated ; 

 and the same remark would apply to some of the corals which 

 stand out as they originally grew on the Carboniferous-Limestone 

 coast-hne of the Liassic sea. Little or no denudation could subse- 

 quently have taken place ; nor were any deposits ever laid down 

 above them, as the hollows and open veins to the sides of which 

 some of these remains are still attached sufficiently attest. The 

 Gasteropoda, for a single locality, are wonderfully varied, since not 

 less than eighty-two species have been recognized. 



Two new genera are present, for which I propose the names of 

 Pterocheilos {P. primus, Moore) and Pleuratella (P. prima, Moore); 

 the latter appears to be allied to Delphinula, and may constitute 

 a subgenus of it. 



The shells of the class Cephalopoda unfortunately afford but little 

 assistance in determining the more exact age of the Brocastle de- 

 posit, as we have recognized in it only two small Ammonites, both of 

 which are young forms. It is, however, clear that they do not belong 

 to species low in the Liassic series. Both are of smooth exterior, and 

 without ornament ; the same forms occur both at Southerndown and 

 in the higher beds of Bridgend, and appear identical with the young 

 of the A. semicostatus. 



Prom this most truly interesting Brocastle deposit it has been my 

 good fortune to recognize in the whole not less than 198 species, 

 which are given below. 



List of Organic Remains from Brocastle. 



Ammonites. 



Nautilus. 



Graotia antiqua, Moore. 



Spongia. 



Involutina liassica, Jones. 



Plan ul aria, sp. 



Montlivaltia simplex, Dune. 



Walliae, Dune. 



Brodiei, Dune. 



■ Murchisonife, Dune. 



pedunculata, Dune. 



lore vis, Dune. 



Theeosmilia irregvlaris,Dune., and 1 var. 



Terquemi, Dune. 



afiinis, Dune. 



• Wallige, Dune. 



dentata. Dune. 



■ plana, Dune. 



Martini, E. de From. 



Michelini, Terq. 



Septastrsea excavata {De From.). 

 Isastrsea Sinemuriensis {D' Orb., sp.). 

 Isastrsea globosa, Dune. 

 Montlivaltia polymorpha, Terq. et 

 Piette. 



Latimseandra denticulata, Dune. 

 Cyatlioccenia dendroidea, Dune. 



costata. Dune. 



Astrocoenia plana. Dune. 



Kutorgiana, Jones. 



curva, Jones, MS. 



dendroidea, Dune. 



minuta. Dune. 



reptans, Dune. 



favoidea, Dune. 



spinigera. Dune. 



— — pedunculata. Dune. 



costata, Dune. 



gibbosa, Dune. 



' insignis. Dune. 



Neuropora mammillata. 



, sp. 



Cidaris Edvrardsii. 

 Echinus, sp. 

 Ophioderma, joints of. 

 Pentacrinus tuberculatus, Mill. 



, sp. 



Serpula socialis, Goldf. 



, several spp. 



Bairdia plebeia, Beuss. 



