INTEBIOE OOLITE OF DOESET AND SOMERSET. 



61 



Pig. 2. — Termination of Ammonites subradiatus, Sow. 



2. A. sebeadiatus, Sow. pi. 421. fig. 2 ; D'Orb. pi. 118. fig. 3 (now 



1 & 2) • also D'Orb. pi. 129. fig. 3. (Fig. 2.) 



The difference insisted npon seems to be that in A. concavus the 

 curved radii are seldom branched, whilst in A. subradiatus, the 

 radii are either branched or have short intermediate ones between 

 the longer ones. There is, however, so much variation in this 

 respect that we still hold these to be mere varieties. 



We have now several complete examples of the termination ; but 

 the first specimen was obtained by Captain Kennedy from our own 

 quarry so perfect that it might have sat for the portrait given by 

 D'Orbigny, pi. 129. fig. 3. It is a very common fossil, and in 

 some quarries occurs mixed with the former so thickly that hun- 

 dreds of examples could be got in a day : and yet a specimen with even 

 the base of the termination is very rare. 



3. A. Edouaedianus, D'Orb. pi. 130. figs. 3-5. 



Is found sparingly with the examples just quoted. Our two 

 specimens are the only ones we have meth wit in the Bradford- 

 Abbas quarry ; and, curiously enough, they have both indications 

 of the termination. 



4. A. Beaie^neidgii, Sow. Min. Conch, t. 184. (Fig/3.) 



This shell was figured by Sowerby in the second volume of Min. 

 Conch., which bears date 1818 ; the specimen, a very imperfect one, 

 was from Dundry, near Bristol. In his description he has the fol- 

 lowing remarks* : — 



" Perfect terminations of the Ammonites are scarce. I have, 

 however, met with several specimens indicating the form o£ the lip ; 

 but none of them exhibit much out of the usual way, excepting 

 some French ones and those now before us : in one of the French 

 specimens the aperture is much contracted by the lip ; in another 

 the lip forms a single arched lobe slightly bent inwards." 



* Min. Conch. yoI. ii. p. 187. 



