222 CHELONIA. 



R. 896. Fragment of rock showing one surface of a bone which is 

 apparently a Chelonian scapulo-precoracoid, and is probably 

 referable to this form. The greater part of the precoracoid 

 is wanting. Wright Collection. Purchased, 1887. 



Genus CHELYTHERIUM, Meyer 1 . 



Known by fragments of the skeleton, which are too imperfect to 

 admit of any opinion being formed as to the affinity of their owner. 

 According to its describer, Proganochelys quenstedti, Baur 2 , from the 

 Kcuper of Wiirtemberg, is certainly distinct from this form and is 

 referred to the Pleurodira. The type specimen of the latter is figured 

 by Quenstedt 3 under the name of Psammochelys Jceuperina. 



Chelytherium obsc^irum, Meyer 4 . 



The type species. Approximating in size to Pleurosternum bul- 

 locJci. 



Hub. Europe (Germany). 



The following specimens were obtained from the Upper Keuper 

 ( Upper Trias) of Stuttgart, Wiirtemberg , and include the types. 

 Most, or all, of them probably belonged to a single individual. 

 They were all obtained ivith the Van Breda Collection. Pur- 

 chased, 1871. 



38650. A bone which appears to be the imperfect first costal of the 

 (Fig.) left side. Described and figured by Meyer in the ' Pala*- 



ontographica,' vol. xiv. p. 121, pi. xxix. figs. 4-7. In the 

 description it was suggested that this bone might be a 

 prefrontal, in which case it certainly could not have be- 

 longed to the same form as the following specimens. The 

 underlying ridge of bone seems, however, to be a rib. 

 Deep sulci formed by epidermal shields are seen at the 

 lateral border of the specimen, but there is no mark occu- 

 pying the position usually held by the sulcus dividing the 

 1st and 2nd vertebral shields. 



38651. A bone which is apparently an imperfect marginal. De- 

 (Fig.) scribed and figured by Meyer, op. cit. p. 122, pi. xxix. 



figs. 2, 3. Several sulci are shown. 



1 Neues Jahrb. 1863, p. 445. 



2 See Zool. Anzeig. vol. xi. p. 417 (1888). 



3 Jahrcsb. Ver. nat. Wiirtt. toI. xlr. p. 120, pis. i., ii. (I860). 



4 Loc. cit. 





