ICHTHTOSATJEID^J. 23 



saurus rather than to Ophthahnosaurus ; but the skull and teeth of 

 the so-called 7. cuvieri are of the Campylodont type, and since pro- 

 podial hones occur in the Kimeridgian which would agree in rela- 

 tive size with the vertebrae of the present form, and are themselves 

 clearly referable to Ichthyosaurus, there is a considerable probability 

 that the present species belongs to that genus. This species was, 

 indeed, provisionally referred by KiprijanofT 1 to the Campylodont 

 subgroup. 



The specimens of scapulas from the Kimeridgian, some of which 

 are probably referable to the present form, have a long and com- 

 paratively straight posterior border, with a marked ridge on the 

 anterior border of the dorsal surface, and resemble the correspond- 

 ing bone of I. platyodon. 



I. posthumus was founded upon Campylodont teeth from the 

 Lower Kimeridgian of Bavaria. 



Bab. Europe (England, (?) France, and (?) Bavaria). 



24803. Four teeth of the Campylodont type, not improbably belong- 

 ing to this species ; from the Kimeridge Clay (Upper 

 Jurassic) of Wootton-Bassett, Wiltshire. These teeth are 

 of the general structure of those of J. eampylodon, and 

 one of them exhibits the flirtings of the dentine of the 



Fig. 12. 



Ichthyosaurus (cf.) trigowuB. — Lateral aspecl of a tooth; from the Kimericlgo 

 Clay of Shotover. { . 



root beneath the investment of cement. They are indis- 

 tinguishable from the type tooth of I. posihwmus, figured 

 by Wagner in the 4 Abh. k. bay. Ak.' vol. vi. pt. 2, pi. xx. 

 figs. 4, 5. Cunnington Collection. Purchased, 1849. 



1 M6m. Ac. Imp. St. Petersbourg, vol. xxviii. art. 8, p. 90 (1881). 



