of Fossil Fishes. 435 



Genus Pholidophorus, Agassiz. 



P. higginsi, Stutchbury. This Pholidophorus was named some 

 years ago by Mr. Stutchbury of the Bristol Institution in honour 

 of its discoverer Mr. Higgins, but has not been described. It is 

 a diminutive species, remarkable for the large size of the scales 

 and the thickness of the ganoine which covers them. Those on 

 the anterior part of the trunk are deeply notched ; the duct tubes 

 of the lateral line are very prominent. 



Locality. Lias, Aust. Decade 8. pi. 7. figs. 1-5. 



P. nitidus, Egerton. This species differs from P. higginsi in 

 the greater regularity and more even surface of the scales, which 

 are also devoid of serrations. The body of the fish is more 

 elongated. 



Locality, Lias, Aust. Decade 8. pi. 7. figs. 6-8. 



Genus Legnonotus, Egerton. 



A small fish remarkable for the extent of the dorsal fin, which 

 occupies the entire length of the back. The scales have consi- 

 derable resemblance to those of Pholidophorus, near to which 

 genus Legnonotv>s must be classified. 



L. cothamensis, Egerton. Until a second species of this genus 

 has been discovered, the generic characters will suffice to identify 

 it. The scales are not unlike those of Pholidophorus higginsi in 

 proportions and relative position and arrangement ; they are 

 more extensively notched at the free margin, and the serrations 

 are shorter and more obtuse. The teeth are stronger and not so 

 numerous as in the Pholidophori. 



Locality. This fish was discovered with the two preceding spe- 

 cies in a block of Gotham marble. Decade 8. pi. 7. figs. 9-12, 



Genus Ptycholepis, Agassiz. 



P. curtus, Egerton. This species is distinguished from the 

 only other species of the genus, Ptycholepis bollensis, Agass., by 

 its shortened body and the large proportions of the head. 



Locality, Lias, Lyme Regis. Decade 8. pi. 8. 



Genus Oxygnathus, Egerton. 



A genus appertaining to the family of the Sauroidei, near 

 Eugnathus, but distinguished from that genus by the sharpened 

 form and thin texture of the dentigerous bones and the smallness 

 of the teeth. The scales have more affinity with those of 

 Acrolepis. 



28* 



