447 



Stratum are ammonite of a tolerably large size; and a smaller species of an 

 oval form, different from those found in any other strata, Vol. III. 

 PI. IX. Fig. 6. Having obtained a specimen of this species from 

 Steyning in Sussex, and knowing that the stratum of hard chalk was 

 worked near Heytesbnry in Wiltshire, I wrote to my late respected 

 friend, Mr. Cunnington, to inquire if 'these fossils were found there or 

 not ; and I was agreeably surprised at receiving of him, from that stra- 

 tum, an oval ammonite of the same species with that which I had found 

 at Steyning. In this stratum are also found the remains of scaphittf, 

 Vol. III. PI. X, Fig. 10*. 



Immediately on this stratum is placed that of the SOFT CHALK, contain- 

 ing silex in the state of sand with interposed layers, and large, interspersed, 

 and irregular nodules of black flint. The fossils of this stratum differ 

 in a very remarkable degree from those of all the inferior strata. Here 

 are, I believe, never found ammonite, trigonita, or scaphita, which were 

 found in the preceding stratum. The fossil remains which are here 

 found are of echinita of different species, particularly of cidaris, galea, 

 galeola and spatangus ; here are also found stellita, terebratulit<z, serpulitg, 

 ostreita, belemnita, a thorny pectenites, turbinated and other madreporita, 

 The remarkable limpet-like shell, p. 51. PI. V. Fig. 3. of the present 

 volume, which is seen I believe in no other stratum; teeth, and rarely 

 the scales and bones of fishes. I believe, in this stratum alone, occur the 

 remains of those small animals figured in Vol. II. PI. XIII. Fig. 24, 

 31, 34, 38, and 39, and which from several of their characters seem to 

 deserve to be regarded as belonging to the family of encrinites. 



* The specimen, PI. XVIII. Fig. 4, is very interesting from its showing the peculiar 

 nature of the fossils of this stratum. It was found in the upper part of the Sussex hard 

 chalk. It has very much the appearance of an echinital spine; but the smaller end is split 

 into several rugae; and in another specimen, not in other respects so perfect, it is seen, that 

 this rufous termination, was an organ of attachment, the fossil being thereby attached to a 

 piece of shell. On this account, there appears to be reason for supposing it to be part of 

 a shell of the same genus with the fossil represented Plate VII. Fig. 18, of this volume, 



