New Species of Fossil Fish. 427 



On the discovery of a new species of Fossil Fish (Strep- 

 sodus Brockbanki) in the Upper Coal Measures 

 Limestone of Levenshulme, No. 6 Group, from 

 the Railway Cutting at Levenshulme, near Man- 

 chester, By James W. Davis, F.G.S., &c. Com- 

 municated by William Brockbank, F.L.S., F.G.S. 



(Received April 2isty iSgi.) 



A number of fragmentary remains have been found in 

 the hard Limestone, which it is proposed to notice in detail. 



No. I, exhibits the section of a tooth split in the 

 matrix longitudinally. The tooth is apparently exhibited 

 from the apex to the base, and has a length of 0015 m. ; 

 of this the crown of the tooth occupies 0010 m. It has a 

 thick external coating of dentine, and the internal cavity 

 is moderately large, wide at the base of the crown, diminish- 

 ing towards the point. The root, as exposed in this 

 specimen, has a width of 0*009 ^- 5 ^^^ appears to have 

 been of a more or less spongey character, with distinct 

 lacunae interspersed in its substance. The under surface 

 of the root exhibits a peculiar notch or incision of the surface 

 which is not ordinarily observed in teeth of this species. 



No. 2 exhibits a portion of one of the large teeth ; 

 the base is broken away, and the point is hidden in the 

 matrix. The surface of the tooth is exhibited, and is the 

 ordinary form exhibited by Strepsodiis^ the twist in the 

 upper part being clearly indicated. The concave inner 

 surface is covered with deeply incised striations, which 

 become gradually effaced towards the convex outer surface, 

 which is quite smooth. 



No. 3 exhibits a broken portion of another tooth 

 similar to the last, but not so well preserved. 



No. 4 is a more important example. It consists of a 

 portion of one of the jaws, exhibiting a section from the 



