33 



POSTSCRIPT. 



The variable teeth grouped under the specific name of Ceratodus polymorphus on 

 p. 28 had already been similarly arranged in 1850 by E. Beyrich, 1 who proposed that 

 the species should be known as C. anglicm. It is now customary, however, to quote 

 this type species of Ceratodus as C. latissimus, thus employing the first of the seven 

 names given by Agassiz to the teeth in question. Numerous specimens have been 

 discovered since the preceding pages were written, and they are now known from the 

 Rhsetic of ten localities in Gloucestershire, Somersetshire, Glamorganshire, Leicester- 

 shire, and Nottinghamshire. 2 



The type specimen of Ceratodus Phillipsii, from the Stonesfield Slate, is now known 

 to be preserved in the Museum of Natural History at Neuchatel. Another characteristic 

 tooth of the same species, in the Northampton Museum, was discovered by Mr. Thomas 

 Jesson in the Great Oolite near Northampton. 3 



A second example of Ceratodus lavissimus was found by the Rev. P. B. Brodie in 

 the Lower Keuper of Coton End, Warwick, and is now in the British Museum.* This 

 tooth is closely similar to that of C. Kaupi from the Lettenkohl of Wiirtemberg, but its 

 denticles are more acute and the ridges more compressed than in the latter form. 



Beyond teeth and unimportant pieces of bone, no fossil remains of Ceratodus have 

 hitherto been found in Britain, and only two discoveries of characteristic portions of the 

 skeleton have been made elsewhere. A tail closely resembling that of the existing 

 Ceratodus is known from the Lettenkohl of Bavaria, and is now in the University 

 Museum at Wiiizburg. 5 A well-preserved skull and mandible from the Upper Keuper 

 of Polzberg, near Lunz, Austria, is also very similar to the corresponding part of the 

 existing species, but differs in its greater degree of ossification. 6 



1 'Zeitsehr. deutscb. geol. Gesell.,' vol. ii (1850), p. 159. 



2 L. Eichardson, 'Proe. Cotteswold Nat. Field Club,' vol. xv (1906), pp. 267—271. 



3 A. S. Woodward, ' Proc. Geol. Assoc.,' vol. xi (1890), p. 292, pi. iii, fig. 5. 



4 A. S. Woodward, ' Anu. and Mag. Nat. Hist ' [6], vol. xii (1893), p. 282, pi. x, fig. 1. 



5 Coelacanthus giganteus, T. C. Winkler, ' Archiv Mus. Teyler,' vol. v (1880), p. 141, pi. ix. 

 Identified with Ceratodus by K. A. von Zittel, ' Sitzungsb. k. bay. Akad., math.-phys. CI.,' 1886 

 p. 259. 



6 Ceratodus Sturi, F. Teller, ' Abhandl. k. k. geol. Eeicbsanst.,' vol. xv, pt. 3 (1891). 



