298 THE EYOLITIOX OF THE LIPAEOCEJRATID.E. [vol. lxxiv. 



and ' striatus-Kke ammonite : could be so used. He agreed with 

 Mr. Buckman that there is little indication of the catagenetic 

 changes which one would expect to follow the sphaerocone stages ; 

 the beginning of 'catagenesis is shown, however, by a tendency to 

 return to paired tubercles in some imparinode series. A unituber- 

 culate stage occurs in some series, and it did not seem necessary 

 to him to suppose a Beanicer as-like ancestor representing this stage. 

 Keplying to Dr. Davies and Prof. Swinnerton, the Author said that 

 the ' skipping ' of the Capricorn stage Avas accompanied by the 

 omission of the slender- whorled stage, leading to the direct develop- 

 ment of the involute form. He did not think that changes in 

 the nature of deposits had any relation to changes in the form of 

 the shell. In conclusion, he wished to thank the Fellows present 

 for the kind reception accorded to his paper. 



