PLATE XII. 



Fig. Page. 



1. Mesodon daviesi, A. S. Woodward; nearly complete fish, two-thirds nat. 



size, with some splenial teeth (1 a), two vomerine teeth (1 b), other 

 teeth from the counterpart (1 c), and the caudal scale (1 d), enlarged 

 three times. — Middle Purbeck Beds ; Swanage, Dorset. The type 

 specimen. British Museum, nos. 41387, P. 6381. op., operculum; 

 pop., preoperculum. 50. 



2. Ditto ; crushed head and anterior abdominal region, six-fifths nat. size. 



—Ibid. Enniskillen Collection (B. M. no. P. 4381). cl., clavicle; 

 d., dentary ; op., operculum ; pop., preoperculum of both sides, the 

 right from within, the left imperfect. 51. 



3. Mesodon parvus, A. S. Woodward ; fish, lacking head, three-halves nat. 



size. — Middle Purbeck Beds ; Teffont, Wiltshire. The type speci- 

 men. Rev. W. R. Andrews Collection (B. M. no. P. 9845). h\, 

 branchiostegal rays ; /./., calcifications along lateral line ; op., 

 operculum ; pop., preoperculum. 52. 



4. Ditto ; fish, lacking tail, three-halves nat. size, with part of mandible 



(4 a) showing dentary (d.) and basal rim of splenial teeth, enlarged 

 six times.— Ibid. T. T. Getting Collection (B. M. no. P. 10954). 53. 



