96 



CHELONIA. 



The following specimens are from the Lower Miocene {Upper OUgocene), 

 and, unless the contrary is stated, are from St. Gerand-le-Puy 

 {Allier), France. 



41097. The imperfect carapace of an adult individual with the 

 hyoplastrals and the left epiplastral in position ; from Aix 

 in Provence. The missing portions of the carapace have 

 been restored in plaster. The contour of the anterior 

 shields of the carapace is shown ; but the bones of the 

 plastron and carapace are completely anchylosed together. 



Purchased, 1868. 



Fig. 18. 



Ptychogaster emydoides. — The right hyoplastral ; from the Lower Miocene 

 of St. G-erand-le-Puy. i . 



30944. The imperfect shell of a smaller individual, restored in 

 plaster. Only the 1st and 2nd neural bones of the cara- 

 pace are preserved, which agree with those of the specimen 

 figured by Gervais in his ' Zool. et Pal. Franchises,' 2nd 

 ed. pi. liii. fig. 5. The alternation in the length of the 

 costals at their proximal and distal extremities is clearly 

 shown. The anterior extremity of the plastron is wanting, 

 but the posterior half is entire. 



Bravard Collection. Purchased, 1852. 



30910. Fragments of the plastron, with a plaster restoration of the 

 missing portions. There is a fragment of the conjoint 

 hyo- and epiplastrals of the right side, which shows the 

 great thickness of the latter bones. Bravard Collection. 



26652. The right hyoplastral of an immature individual. Figured 

 {Fig.) in the accompanying woodcut (fig. 18). Wo anclrylosis had 

 taken place with the adjacent bones, 



Pomel Collection. Purchased, 1851. 



26652 a. A nearly similar right hyoplastral, with the inner border 

 imperfect. Pomel Collection. 



