154 CHELONTA. 



R. 2 a. Fragment of the carapace of an apparently older individual, 

 (Fig.) showing the 4th, 5th, and 6th neurals, with portions of 

 the 4th and 5th costals ; from Weymouth. One of the 

 types ; the 4th and 5th neurals and costals are figured by 

 Seeley, op. cit. pi. xiii. fig. 1, in conjunction with the 

 preceding specimen. The lateral excavation of the 5th 

 neural, which is traversed by the sulcus dividing the 3rd 

 and 4th vertebral shields, is well shown. 



Purchased, 1880. 



44177. Part of the carapace of a more nearly adult individual; 



(Fig.) from Weymouth. This specimen shows the neurals from 

 the fourth to the eighth, with portions of the costals, the 

 last three neurals and costals being completely anchylosed 

 together. It is one of the types ; the last three neurals 

 and accompanying fragments of the costals being figured 

 by Seeley, op. cit. pi. xiii. fig. 1, in conjunction with the 

 last specimen ; they are marked b in the figure. The 

 characteristic form of the 5th neural is well shown ; the 

 anterior and posterior sulci of the 4th vertebral shield 

 respectively traverse the 5th and 8th neurals, forming 

 a bold transverse depression, preceded by a ridge. The 

 5th left costal has been fitted to the specimen since it was 

 figured, and shows its imperfect ossification and thinness. 



Purchased, 1873. 



44177 a. Fragment of the carapace of a young individual, showing 

 the 5th, 6th, and 7th neurals, and fragments of three of 

 the accompanying costals : from Weymouth. Noticed by 

 Seeley, op. cit. p. 234. The 7th neural is short, with 

 relatively long antero-lateral facets. Purchased, 1873. 



44177 b. An imperfect peripheral bone of the carapace regarded by 

 (Fig.) Seeley as the pygal ; from Weymouth. One of the types ; 

 figured, op. cit. pi. xiii. fig. 1 ; marked c in figure. 



Purchased, 1873. 



41235. A marginal bone ; from Weymouth. One of the types ; 

 {Fig.) figured, op. cit. pi. xiii. fig. 1 ; marked d in figure. The 

 pit for the extremity of the rib is well shown. 



Purchased, 1865. 



44178. The fifth neural bone of a nearly adult individual ; from 

 Weymouth. The excavation of the postero-lateral surfaces 

 and the sulcus of the vertebral shield arc well shown. 



Purchased, 1873. 





