16 ICHTHTOPTERTGIA. 



quadrangular type. Similar humeri are also found in association 

 with teeth referred to this species in the Gault of Prance *. The 

 cervical and anterior dorsal vertebras from the Russian Cretaceous, 

 figured by Kiprijanoff 2 , have the pentagonal and subcordiform ter- 

 minal faces characteristic of /. trie/onus ; the contour of the later 

 vertebras also resembling that obtaining in the same species. In 

 the Cambridge Greensand humeri and femora of the above-men- 

 tioned type occur, together with those of Ophthalmosaurus. The 

 Russian specimens are from beds probably equivalent to the Gault. 



/. strombechi, Meyer 3 , from the Lower Greensand of North 

 Germany, is provisionally regarded by Kiprijanoff 4 as founded upon 

 young teeth of the present species, but it is very probably distinct ; 

 and both that form and /. polyptychodon, Koken 5 , from the same 

 deposits, may be allied to the Kimeridgian species. 



Hob. Europe. 



328,10. Part of the dentary bone of the left ramus of the mandible, 



(Fig.) containing eight entire teeth ; from the Lower Chalk near 



Dover, Kent. Described and figured by Owen in his 



' Cretaceous Reptilia ' (Mon. Pal. Soc), p. 69, pi. xxiii. 



fig. 1 ; the figure being reversed. 



Taylor Collection. Purchased, 1854. 



32811. Part of the right ramus of the same mandible, containing 

 (Fig.) part of the splenial and part of the dentary, and exhibiting 



several displaced teeth, of which two are entire ; from 

 the same locality. Described and figured by Owen, op. cit. 

 p. 70, pi. xxiii. fig. 2 ; the figure being reversed. 



Taylor Collection. 



32812. The anterior extremity of the right ramus of the same 

 (Fig.) mandible. Described and figured by Owen, op. cit. p. 71, 



pi. xxiii. fig. 3 ; the figure being reversed. 



Taylor Collection. 



41895. The broken anterior portion of the rostrum of the skull ; 

 from the Chalk-Marl of Trumpington, near Cambridge. 

 The extremity is nearly entire, although almost all the 

 teeth are broken. Purchased, 1869. 



R. 13. Fragment of the rostrum, exhibiting several teeth in position, 

 and a transverse section ; from the Lower Chalk at Dover. 

 The transverse section is similar to the one figured by 



1 Sauvage, Mem. Soc. Geol. France, ser. 3, vol. ii. art. 4, pi. xxxii. figs. 6, 7 

 (1882). 2 Op. cit.pl. xi. 



3 Palseontographica, vol. x. art. 2, p. 83 (1862). 4 Op. cit. 



5 Zeitsckr. deutscb. geol. Ges. vol. xxxy. p. 737 (1883). 



