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) Tamarindus, Sow. Pleurotomaria DeLahayesii, D’Orb. 
celtica. Pecten Robinaldinus, D’Orb. 
Sphera Sedgwickii, ». 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 Woodwardian Museum and in the 
collection of James Carter, Esq., who kindly informed me of the 
occurrence of these fishes at Ely :— 
Spherodus gigas, dg. (Palatal teeth.) Very common. 
Pycnodus, sp. (Palatal teeth.) 
Gyrodus, sp. (Palates.) 
Asteracanthus ornatissimus, 4g. (Dorsal spines.) Common. 
Leptacanthus. (Spine.) 
Hybodus, sp. (Spines and teeth.) 
Sphenonchus. 
Lepidotus, sp. (Scales.) 
Psammodus reticulatus, 4g. (Palatal teeth.) Common. 
Edaphodon, sp. 
The remains of reptiles consist chiefly of rolled bones and 
teeth of Plesiosaurus and Ichthyosaurus ; water-worn teeth of 
Plhosaurus (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 Elyt. 
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 zqualis, Sow. 
Exogyra conica, Sow. Myacites plicata, Sow. 
Plicatula, sp. 
+ Mr. H. 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. 
