Vol. 54,] CORALLIAN ROCKS OF UPWARE. ' 603 



The species marked with an asterisk have not been found in the 

 I^orthern Quarry. It is noticeable that spines of Cidaris Jlorigemma 

 were not very unusual, but the lowest bed of oolite here is probably 

 not more than 10 feet below the base of the Rag. Eccogyra nana, 

 Ostrea gregaria, Littorina muricata^ Cerithium muricatum, Holec- 

 typus, and Serpula were moderately abundant. The eleven species 

 not recorded from the I^orthern Quarry seem to belong to rather 

 shallow-water genera for the most part. Holectypus and Echino- 

 hrissus^ so common in the Northern Quarry, are found here in 

 diminished numbers. No doubt the other Northern Quarry sea- 

 urchins might be found here, for they have been found higher up in 

 a more fossiliferous bed of the oolite. On the other hand, the reef- 

 corals of the Rag are absent, and its characteristic Jarge Pectens and 

 Areas are wanting here, or very rare. 



It will be noticed that the fauna of this lowest oolite of the 

 Southern Quarry is intermediate in character between those of the 

 Eag and of the Northern Quarry. The change is probably due 

 more to diminution of depth of water than to difference of geological 

 horizon. 



The higher beds of the oolite, as exposed in the middle of the 

 Southern Quarry, are much more fossiliferous. A large quantity 

 of material was quarried here during the spring of 1898, and 

 Mr. H. Keeping, of the Woodwardian Museum, obtained a fine 

 series of specimens. Still more ' Rag ' forms come in here, but the 

 principal Northern Quarry sea-urchins are still present. More 

 specimens of Pygaster than of any other urchin were obtained here : 

 it is noticeable that in the Northern Quarry it is far less common 

 than Holectypus and Echinohrissus. It is from these beds, or but 

 slightly higher, that the late T. Roberts obtained Echinohrissus, 

 CoUyrites, Holectypus, Hyhoclypus, and Pygaster. I have examined 

 the specimens obtained by Mr. Keeping, and have identified the 

 following, adding a few which I have myself noticed since : — 



Cephalopoda. 



Ammonites (PerisphiTictes) Achilles, 



d'Orb. 

 Belemnites ahhreviatus, Mill. 



Gasteropoda. 



Cerithium muricatum. Sow. 

 Chemnitzia heddingtonensis, Sow. 

 Littorina Meriani, Goldf. 

 L. muricata, Sow. 

 Pkasianella striata, Sow. 

 Pleurotomaria sp. 



Lamellibranchiata. 



Area quadrisulcata, Sow. 



Astarte ovata, Smith. 



Cardium sp. ? 



Gervillia aviculoides, Sow. 



Gervillia sp. | P. vimineus, Sow. 



2tj2 



Goniomya v-scripta, Sow. 



Hinnites tiimidus, Ziet. 



Romomya tremula, Buv. 



Isocardia sp. 



Lima Icsviiiscula, Sow. 



L. rigida, Sow. 



L. rudis, Sow. 



Lithodomus inclicsus, Phil. 



Lucina raoreana, Buv. 



Modiola subcBquiplicata, Goldf. 



M. ungulata, 7t. & B. 



Mytilus jurensis, Mer. 



M. peetinatus, Sow. 



Opis arduennensis, d'Orb. 



0. Phillipsi, Mor. 



0. large sp. 



0. virdunensis, Buv. 



Pecten articulatus, Schloth. 



P. incequicostatus, Phil. 



