268 PROCEEDINGS COTTESWOLD CLUB 1906 
Bed (15) zz sztu the well-preserved tooth represented in 
annexed figure. 
The teeth of Ceratodus, upon which Agassiz originally 
founded several “ species,” came from Aust Cliff on the 
Severn. E. T. Higgins also collected a number of speci- 
mens at the same locality, and as several of them appeared 
Fig. 1. TOOTH OF CERATODUS LATISSIMUS, L. AGASSIZ. 
Garden Cliff, Westbury-on-Severn. 
distinct from known forms, he gave them specific names."* 
Beyrich recognised that it was undesirable to thus 
multiply names, and suggested that the name Ceratodus 
anglicus should replace them all.* 
Prof. L. C. Miall came to a very similar conclusion, 
but instead of one, made two groups. In the one group 
he collected the large teeth of very variable form, and dis- 
tinguished them by the name Ceratodus polymorphus. 
He did not employ Agassiz’s names, such as Ceratodus 
altus, C. emarginatus, etc., because they were too descrip- 
tive. In the other group he included the smaller and more 
1 In Morris’ Catal, Brit. Foss. (1854, 2nd ed.) 
2 E. Beyrich, Zeitschr. deutsch. geol. Gesell., vol. ii. (1850), p. 159. 
