TESTTJDINIDiE. 97 



30920. The left hyoplastral of a younger individual. The buttress 



is entire. Bravard Collection. 



26652 b. The two hypoplastrals and the imperfect right xiphiplas- 

 tral of an immature individual. Pomel Collection. 



26652 C. The right hypoplastral of a smaller individual. 



Pomel Collection. 



R. 1583. A nearly similar right hypoplastral. No history. 



R. 1584. A similar left hypoplastral. No history. 



30921. A smaller left hypoplastral, wanting the antero-external 



angle, Bravard Collection. 



30931. Fragment of a similar right hypoplastral. 



Bravard Collection. 



30935. A first left costal probably referable to an immature indivi- 

 dual of this species. The surface for the attachment of 

 the axillary buttress is shown. Bravard Collection. 



Ptychogaster pomeli, Lydekker, n. sp. l 



Considerably smaller thau the preceding, with the epiplastrals 

 less thickened anteriorly ; upper surface of thickened portion of 

 epiplastrals elongated antero-posteriorly, and without median pro- 

 minence. Gular shields long and narrow. 



Fig. 19. 



Ptychogaster pomeli. — Anterior extremity of the plastron, viewed from the ventral 

 and dorsal aspects ; from the Lower Miocene of St. Grerand-le-Puy. J. 

 g, gular ; hu, humeral shield. 



The anchylosis of the component bones in the typical specimen 

 indicates that this form cannot be the young of the type species. 

 Hah. Europe (France). 



1 The names P. vandenheckii and P. abbreviate: applied by Pomel (Cata- 

 logue Methodique, p. 121, 1853) are not sufficiently denned to admit of com- 

 parison, but the former indicates a larger species Uiau P. emydoides. 



PART III. B 



