ARCHiEOCnELYS. 



219 



The evidence for the presence of mesoplastrals is on the assumption 

 that the hyoplastrals are entire ; if, however, these specimens are 

 only the anterior part of the hyoplastral, there would be no evidence 

 for the presence of those elements. 



Archseochelys valdensis, Lydekker l . 

 The type and only described species. 

 Hah. Europe (England). 



Fig. 50. 



Archcsochclys valdensis. — A. Left hyoplastral (?) ; i.g, intergulaf shield ; hum, 

 humeral do. ; pec, pectoral do, ; i.pec, interpectoral do. B. The imperfect 

 posterior extremity of the left side of the plastron; i.ab, interabdominal 

 shield ; ah, abdominal do. ; fern, femoral do. ; an, anal do. ; i.fcm, inter- 

 femoral do. From the Wealden of Cuckfield. § . 



3532. A bone which appears to be the nearly entire hyoplastral of 

 {Fig.) the left side ; from the Wealden of Cuckfield, Sussex. One 



of the types ; figured by the writer in the ' Quart. Journ. 

 Geol. Soc' vol. xlv. p. 512, fig. 2. The areas occupied by' 

 the humeral, pectoral, intergular, and interpectoral shields 

 are more or less fully shown (fig. 50, A). 



Mantell Collection. Purchased, 1838. 



3533. A somewhat smaller specimen of the homologous bone ; from 

 (Fig.) Cuckfield. Figured by ]tfan tell in his ' Fossils of Tilgate 



Forest,' pi. vii. fig. 3, without name, and noticed by the 

 writer, he. cit. The median series of shields is relatively 

 narrower, and the lateral series broader than in the pre- 

 ceding specimen. Mantell Collection. 

 1 Geol. Mag. dec. iii. vol. vi. p. 377 (1889). 



