80 VERTEBRATA. 



CROCODILIANS. 



Goniopholis? The crocodilian remains from Upware and 

 Brickhill consist of teeth and a fragment of skull. The teeth are 

 of the common crocodilian type, conical, terete, and slightly curved, 

 with a pair of strong lateral crests, similar to the teeth of the 

 Goniopholis of the Wealden. 



A fragment of skull-bone exhibits the characteristic rain-pit 

 surface-sculpturing of the crocodiles. 



The lance-shaped teeth of Dakosaurus are of Kimmeridgian 

 age, occurring at Upware only as ' derived ' fossils. 



PISCES. 



NATIVE FISHES. 



The remains of Fishes consist of teeth, fragments of jaws, and 

 dermal spines, with occasional fragments of bones. For the 

 most part they are rare fossils, but the hemispherical teeth of 

 Sphcerodus (known as buttons by the workmen) are amongst the 

 most common and conspicuous fossils of the deposit. These are 

 more or less mineralized with oxide of iron and phosphate of lime, 

 principally the former, and the roots of the teeth have not served 

 as centres for the formation of phosphatic nodules, such as is 

 commonly the case with the derived teeth in the coprolite beds of 

 the Suffolk Crag. 



The close correspondence of the fish fauna in the Neocomian 

 rocks of Upware, and St Croix in Switzerland, is very remarkable. 

 Our Sphcerodus teeth are identical with their S. Neocomiensis, Ag., 

 our Pycnodus with their P. Couloni, Ag., and the jaws and teeth 

 of Gyrodus are also similar in the two places. Again the Upware 

 Strophodus corresponds well with that figured by MM. Pictet and 

 Campiche (Terr. Crti. St Croix, PI. xn. pp. 17). 



The same Sphcerodus occurs at Shanklin in the Isle of Wight, at 

 Landeron,Neuchatel, Alais, and Auxerre. Now in these latter places 

 derived fossils are, so far as I can learn, either unknown, or of very 

 rare occurrence, and there seems to be no reason to doubt that the 

 fishes' teeth likewise belonged to animals who lived in the Neoco- 



