31 



at the posterior border of the oral surface. Carapace long and 

 narrow, with decply emarginate nuchal ; neurals coraparatively short 

 und wiJe, with the antero- and postero -latéral surfaces of subci^ual 

 length, und with a strong keol ; costals long aatero-posteriorly, and 

 extcnding only a short distance down the ribs, which are slcnder 

 and faharply defiued ; marginals long, and the posterior ones with 

 the free border entirc. In conséquence of the form of the neurals 

 the intercostal sutures join the middle of the sides of the neurals. 



The contour of the mandibular symphysis approximates to that 

 obtaining in A r y illochely s, but the pterygoids, as figured by Winkler 

 (' Tortues Fossilcd,' pl. ix.), are of the type of those of Chelone. 

 The bones ôgared by Winkler, oj). cit. pl. x., as the coracoid belong 

 to the pelvic girdle. There is no évidence to show that the frag- 

 menta from the English Chalk referred provisionally by Owen to 

 this species are rightly named. A fine example of the cranium is 

 figured by Ubaghs i n the ' Bull. Soc. Belg. Gëol.' vol. ii. p is , x.-xiii. 



Hab. Europe (ÏÏoliand). 



Tht folloivinj sjttcimens were oltained from the Upjiermosi Oretaceous 

 of Maastricht^ HollaïuL ; a/idy unless the contrary is atated, 

 belong to the Vati Breda Collection, Purchased, 1871. 



42913. Slab showing the anterior and left latéral aspect of the 

 imperfect skull, a large portion of the marginal région of 

 the carapace, and portions of the plastron and pelvis 

 The gênerai contour of the cranium rcsomblos that oi 

 C. imhricata. 



42889. blab showing the oral aspect of the imperfect mandible, 

 {Fiy.) Figured by Winkler in his 'Tortues Fossiles conservée! 



dans le Musée Teyler, etc.' (Haarlem, 1869), pl. xiv. figs 

 40, 47. The symphysis is damaged, but its relative 

 shortness is well ehown. 



42890. The mandible, imperfect posteriorly. The symphysis ha 



been somewhafc waterwom, but exhibits its characteristi 

 features. 



42891. The symphysial région of the mandible, with the oral sui 



face concealed by matrix. 



42892. The imperfect symphysis of the mandible. As in the pn 



ceding spécimens, the summitfi of the alvcolar walls ha\ 

 Vu»ftn wom awav. 



