60 



J. BUCKALiX OX AMMONITES EROAL THE 



is referred to A. subradiatus ; but it is very different from that which, 

 is now recognized by this name,— A. Brightii, which it is said to 

 resemble, being an Oxford-Clay fossil, while the Dundry Oolite is 

 the exact equivalent of the Dorset Cephalopoda-bed. I hope there- 

 fore some day to see this specimen in its place at the British Mu- 

 seum. 



I now proceed to pen a few notes on these fourteen forms which 

 we have observed to present more or less perfect terminations to 

 their shells ; and in doing so I would express the hope that ere 

 long other forms will be met with to enable us more clearly to un- 

 derstand the value of a more complete structure, while at the 

 same time it may not be too much to express a hope that better 

 specimens may yet be found than those we already possess or, 

 through the kindness of friends, have had access to. 



i\OTES OX THE SPECIES. 



Pig. 1. — Termination of Ammonites concavus, Soiu. 



1. Ammoxites coxcavtjs, Sowerby, pi. 94, fig. 2. (Fig. 1.) 



This is a very common shell in the Cephalopoda-bed in Dorset 

 and Somersetshire, occurring less frequently in the same horizon in 

 Gloucestershire. It is a very variable shell ; and hence its syno- 

 nyms are unusually numerous. 



In this district we have usually named it A. sub?'adiatus ; and it is 

 here only retained because A. concavus was figured by Sowerby from 

 a specimen obtained from this neighbourhood. 



