Manchester Memoirs, Vol. Iv. (191 1), No. 18. 9 



in the figure. It is difficult, allowing for the different 

 class of preservation, to see how Steneosmirus latifrous, 

 Owen, differs from Steneosaurus brevior, Blake. The 

 species is really a Mystriosaurus. 



3. MetriorhyncJins hastifer from the Kinimeridge clay of 



England. 

 The Sedgewick Museum at Cambridge contains the 

 anterior end of the snout of a MetriorliyncJins from the 

 Kimmeridge clay of Ely that undoubtedly belongs to 

 M. hastifer. The specimen is of interest, because it 

 shews the very perfectly preserved anterior nares, which 

 are of the ordinary type. The tip of a tooth is visible 

 in one of the alveoli. It has a crown covered with fine 

 irregular, more or less longitudinal, wavy ribs. It appears 

 to be definitely identical with the tooth figured by Phillips 

 as Steneosaurus longirostris, Cuv. Phillips' specimen 

 consists of the alveolar borders of a large part of the 

 upper jaw, and so far as it goes appears to agree closely 

 with the type specimen of M. hastifer now at Paris. 



The Oxford University Museum also contains a very 

 characteristic frontal of this species from the Kimmeridge 

 clay of Shotover. 



4. "' PetrosHcJiHS lacvidens ''from the Purbeck of Swanage. 



This species was founded by Owen on a skull and 

 mandible from the Middle Purbeck of Swanage, theo- 

 retically associated together. 



The skull is exceedingly crushed and somewhat 

 weathered, but with care all the sutures of the upper 

 surface can be made out. They are shewn in Text- 

 figure 3. When this figure is compared with the figure of 

 MacrorhyncJius scJiaumbergensis, given by Koken, no 



