PLACODOXTID^E. 9 



R. 1644. The imperfect cranium ; from the Muschelkalk of Bai- 

 (Fig.) reuth, Bavaria (fig. 1). The type specimen ; figured by 

 Owen in the < Phil. Trans/ for 1858, pi. ix. figs. 1, 2, and 

 pi. x. fig. 1. Since the original figures were drawD the 

 matrix has been chiselled away, in order to exhibit the 

 passage connecting the anterior and posterior nares. 



Purchased^ 1857. 



R. 1644 a. A restored plaster-model of the preceding specimen. 



Made in the Museum, 1888. 



35711. The imperfect mandible, with the oral surface buried in 

 matrix ; from Baireuth. This specimen, which shows 

 successional teeth with the plane of their crowns placed 

 nearly vertically in the ramus, agrees so well in relative 

 size and contour with the cranium that there can be no 

 hesitation in referring it to the same species. The sym- 

 physis is triangular, with a length of 0,070 (2*73 inches) 

 and a width of 0,095 (3*73 inches) ; it may have had no 

 anterior teeth. Purchased, 1860. 



Cyamodus tarnowitzensis, Giirich *. 



Distinguished from the preceding species by the one premaxillary tooth 

 being placed in the line of the three maxillary teeth, with which it forms a 

 continuous series ; and by the larger size of the posterior nares. 



Hah. Europe (Siberia). 



Unrepresented in the Museum. 



Pleurodus bicolor, Giirich 2 . 



This name has been applied to teeth from the Muschelkalk of Silesia, which 

 are considered to indicate a member of this group ; the generic name is, however, 

 preoccupied {vide supra, Pt. T. p. 53) by Pleurodon. 



1 Zeitschr. deutsch. geol. Ges. vol. xxxvi. p. 136 (1884). 



2 Jahreshber. Schles. Ges. for 1884, p. 220 (1885). 



