App. D.] Dr. PiTTON on the Strata below the Chalk. 383* 



suspected to belong to Pterodactyles, were correctly referred to birds. On placing some of the 

 questionable fragments before Mr. Owen, of the College of Surgeons, that gentleman found 

 in a tarso-metatarsal bone, the articular surface and place of attachment of the posterior, or oppo- 

 site toe, distinctly indicated ; and on a comparison of these fragments with the foot of a recent 

 Ardea, no doubt remained as to the similarity of their structure. This short paper beautifully 

 illustrates the bearing of exact comparative anatomy upon Geology. 



Supposed Wealden in Northamptonshire. — Mr. Lonsdale having, during the last summer, resumed 

 his examination of the oolitic system, and followed out the series from the north of Oxfordshire 

 to the Humber, informs me, that he did r,ot observe any traces of ihe Wealden in the vicinity of 

 Wansford ; which is mentioned at p. 309. as the place where a beautiful specimen oi Lonchopteris 

 Mantellii was supposed to have been found. The tract belongs to the great oolite, which is the 

 highest formation, and is extensively quarried in every direction around Wansford : on the west 

 of Peterborough, the highest formation is the cornbrash. Mr. Lonsdale, therefore, thinks that the 

 occurrence of any portion of the Wealden group in such a situation, is extremely improbable, and 

 that the specimen above referred to may have been ascribed to that place by mistake. 



Supposed Chalk in Rutlandshire, — The existence of Chalk, in situ, at Ridlington, in Rutland- 

 shire, Mri Lonsdale considers also as being very improbable. The village stands on the ferru- 

 ginous sand of the inferior oolite ; about half a mile west of it, is a small pit of the bottom 

 beds of the great oolite, now a subsided mass : and great oolite is quarried near Brooke Hall, two 

 miles north of Ridlington ; but with the exception first mentioned, there is no trace of any stratum 

 superior to the inferior oolite, in the immediate neighbourhood of that village. 



Inoceramus intermedius. — This fossil, which is mentioned at p. 317, as from Hunstanton cliff in 

 West Norfolk, is a new species, ascertained by Mr. Sowerby ; by whom a drawing of it was 

 made, for a Wood-cut, published in Loudon's " Magazine of Natural History," for 1829, vol. ii. 

 p. 296. Mr. Sowerby informs me that its occurrence is not unfrequent in the flinty chalk of Nor- 

 folk and Kent ; and that it is found occasionally, in flint, in the gravel around London. 



VOL. IV. SECOND SERIES. 3 C 



