PLATE 55 



(All figures natural size) 

 Figs. I, 2. Synthetodus calvini Eastman. Dental plate. E 2017, p. 150. 

 I, inserted face; 2, oral face, showing a large worn boss. 



Fig. 3. Acmoniodus clarkei,n.g.,n.sp. Type. Large dental plate, in oral view; 

 nat. size. It shows an elliptical anterior tritor, and a larger, subtriangular, pos 

 terior tritor. (Cf. te.xt-fig. 53.) E 2575, p. 152. 



308 



