in the Lower Greensand of Bedfordshire. 385 



Lower Greensand, and do not present any traces of having been 

 rolled. Amongst these I have determined 



T. (Waldheimia) Tamariadus, Sow. Pleurotomaria DeLahayesii, D'Orb. 



celtica. Pecten Robinaldinus, D'Orb. 



Sphaera Sedgwickii, n. sp. Ostrea macroptera, Sow. 



1 have also found ferruginous casts of other shells*. I have no 

 doubt that this list will be largely increased. 



The remains of fishes seem to be principally derived from the 

 Kimmeridge Clay. I have obtained the following species, which 

 have also been found in the Kimmeridge Clay of Ely, specimens 

 of which may be seen in the AVoodwardian Museum and in the 

 collection of James Carter, Esq., who kindly informed me of the 

 occurrence of these fishes at Ely : — 



Sphserodus gigas, Ag. (Palatal teeth.) Very common. 



Pycnodus, sp. (Palatal teeth.) 



Gyrodus, sp. (Palates.) 



Asteracanthus ornatissimus, Ag. (Dorsal spines.) Common. 



Leptacanthus. (Spine.) 



Hybodus, sp. (Spines and teeth.) 



Sphenonchus. 



Lepidotus, sp. (Scales.) 



Psammodus reticulatus, Ag. (Palatal teeth.) Common. 



Edaphodon, sp. 



The remains of reptiles consist chiefly of rolled bones and 

 teeth of Plesiosaurus and Ichthyosaurus ; water-worn teeth of 

 Pliosaurus (which reptile is characteristic of the Upper and 

 Middle Oolites) also occur in considerable quantities. Some 

 teeth of crocodilian character are found here as well as at Elyf. 



I announced in the 'Annals of Natural History* the discovery 

 in this bed of water-worn remains of the Iguanodon, which pro- 

 bably have been derived from the denudation of a deposit of 

 Wealden which formerly existed near this district. Since then, 

 I have obtained several more bones and teeth of this reptile. 

 Mr. Keeping has likewise collected" some fine specimens for the 

 Woodwardian Museum, which previously contained no fossils 

 from this deposit. 



Further evidence of the existence of the Wealden at some 

 period in this part of England has since been obtained by Mr. 

 Keeping, whose practical acquaintance with this formation is 

 well known : amongst the fossils collected by him are several 



* Terebratula depressa, Lamk. Modiola sequalis. Sow. 

 Exogyra conica, Sow. Myacites plicata, Sow. 



Plicatula, sp. 

 t Mr. 11. Woodward, of the British Museum, kindly informed me that 

 these teeth probably belong to a species of Dakosaurus (Quenstedt), which 

 genus occurs in the White Jura. 



