438 



F. G. H. PRICE ON THE BEDS BETWEEN THE 



the place is "well marked by the breaking-out of a very copious and 

 perennial spring called " Lydden Spout," which issues from the top 

 of these marly beds, a situation probably corresponding to that of 

 the springs which everywhere appear in the interior along the 

 foot of the chalk range*. 



This bed, in common with some of the others, is traversed by 

 seams of calcite. The nodules of iron pyrites found in this bed are 

 mostly small, some spherical, some cylindrical with rounded ends, 

 having a smooth surface, silvery and very bright. When broken, 

 they all exhibit a radiating structure from the centre. It is a re- 

 markable fact that the forms of these nodules vary in every band. 



These three beds, III., IV., and V., I propose to term the zone of 

 Ammonites rhotomagensis and varians, which equal Dr. Barrois's zone 

 of A. varians. Mr. Jukes-Browne considers this bed equal to the 

 dark sandy building-stone of Burwell near Cambridge. 



The following is a list of the fossils : — 



Micrabacia coronula. 

 Pollicipes glaber (rare). . 



Goniaster niosaicus. 

 Cidaris clissimilis. 

 Pseudocliaderiia ornatum. 



variolare. 



, sp. 



Peltastes clatbratus. 

 Salenia Clarkii. 

 Hemiaster Morrisii. 

 E piaster crassissiruus. 

 Serpula annulata. 

 Vermicularia umbonata. 

 Palaega Carteri (rare). 

 Enoploclytia sussexiensis. 

 Hoploparia, claws. 

 Crab, sp. 



Terebratulina rigida (nodulated var. 

 very common). 



striata. 



Terebratula squamosa. 

 Kingena lima. 

 Rbycbonella Grasiana. 



Mantel liana (common). 



Martini. 



Avicula grypbteoides. 

 Exogyra baliotoidea. 

 Lima globosa. 



aspera. 



parallela. 



Mytilus, sp. nov. 

 Pecten Beaveri. 



elongatus. 



orbicularis. 



Janira quadricostata. 



quinquecostata. 



Plicatula pectinoides. 



sigilbna. 



Ostrea Nbrrnaniana. 



Rauliniana. 



Area fibrosa. 

 Area nana. 



Area carinata. 

 Pboladomya decussata. 

 Cardita tenuicosta. 

 Natica, sp. 

 Nucula pectinata. 

 Pleurot.omaria, sp. 

 Voluta semiplicata. 

 Aporrhais Mantelli. 

 Rostellaria Pricei. 

 Fusus, sp. 



Emarginula Gresslyi, P. $ C. 

 Turbo Triboleti, P. ^ C. 

 Scalaria Dupiniana. 

 Cerithium Lallierianum. 



trimonile. 



Ornitbopus oligocbila. 



pacbysoma. 



Dimorpbosoma doratochilum . 



opeatocbilum. 



spatbocbilum. 



Solarium, sp. 



or Turbo. 



Dentalium medium. 

 Turritella, sp. 

 Ammonites cenomanensis. 



Coupei. 



rbotomagensis. 



varians. 



1 sp. 



Ancyloceras. 

 Nautilus elegans. 



Deslongcbampsianus. 



Belemnites plenus, var. 

 Turrilites costatus. 

 Iscbyodus. 

 Macropoma, sp. 

 Pisodus. 

 Fisb-coprolites. 

 Lamna, sp. 



subulata. 



Oxyrbina Mantelli. 



* Dr. Fitton, " On tbe Strata below tbe Chalk," Trans. Geol. Soc. vol. iv. 2nd ser. 



