REMAINS OF AN ICHTHYOSAURUS. 389 



pansus of De Koninck, a Russian species; but, besides that 

 being a very much smaller shell, De Koninck particularly 

 says, that near the cardinal edge the ribs are very fine or ab- 

 sent, and that there is no trace of cardinal tubes along them. 

 His figure agrees with this description. 



In plate ix. of his excellent monograph* he has given a figure 

 of a very wide variety, strongly bilobed, but not so deeply as 

 ours, and without the submarginal spines which other specimens 

 show ; and in thus enumerating the many varieties and exten- 

 sive range of the species, f he gives us additional reason for 

 admitting this one as a Polar variety. 



All the specimens are striated coarsely, though our figure 

 14, which is very much worn, shows them but faintly. There 

 are some large loose shining tubes (fig. 15) in the rock, which 

 probably belong to this fossil. 



LOCALITY. Depot Point, in whitish and also in reddish 

 limestone. 



The two carboniferous species identified by Prof. Haughton 

 from Melville Island are, Productus aculeatus and Spirifer 



(rotundatus ?) . 



J. W. S. 



Note on some Remains of an Ichthyosaurus discovered by Cap- 

 tain Sir Edivard Belcher, C.B., R.N., at Exmouth Island, 

 in lat. 77 16' N., long. 96 W. By PROFESSOR OWEN, 

 F.R.S., F.G.S. 



The specimens submitted to me by Captain Sir Edward 

 Belcher, which form the subjects of Plate XXXI., are fossil 

 remains of vertebrae and portions of ribs of an Ichthyosaurus. 



Figs. 1, 2, and 3 represent the largest and best preserved 

 fossil, which is the body of an anterior abdominal vertebra. 



* Monogr. des Productus, etc., in Eecherches sur les Anim. foss. 

 premiere partie, 1847. 



f Even up to the Icy Sea in Russia. 



