Manchester Memoirs, Vol. Ix. (191 6), No. %. 37 



interest. There is a large infra-clavicle passing within its 

 lower end. Our specimens add nothing to the existing 

 knowledge of the paired fins, but suggest, though we do 

 not wish to insist that they prove, that there is some 

 distinction between the dorsal fin and the upper lobe of 

 the tail, and that the lower lobe of the tail is supported 

 by a row of elements which articulate with the lower end 

 of the haemal spines. 



Sagenodus incequalis. Owen. 



The Manchester Museum contains a very remarkable 

 specimen of Sagenodus in&qualis. This is preserved in a 

 slab, apparently of cannel, containing specimens of a 

 Lamellibranch which appears to be Antliracomya phillipsi. 

 Will, and therefore suggests that the specimen comes from 

 a horizon high in the Middle Coal Measures or in the 

 Upper Coal Measures. It is almost certainly of local 

 origin. The specimen shows the head of the fish with the 

 lower jaw in position much crushed dorso-ventrally and 

 viewed from the ventral side. The palate and lower jaw 

 are in natural articulation, but the plates of the dorsal 

 surface of the head have slipped backwards and to one 

 side. They are somewhat broken and to some extent 

 only represented by an impression but the whole shield 

 agrees fairly well with those previously figured by Barkas 

 and its plan is represented in Text-fig. 8 F. The anterior 

 part of the parasphenoid with both palato-pterygoids 

 articulated with it is well shown, the left upper tooth being 

 beautifully displayed. On the right side the tooth and its 

 supporting bone have been largely broken away so that 

 they are represented by an impression of the dorsal sur- 

 face and by a sectional view of their outer part. With this 

 the corresponding lower tooth is in natural apposition. 

 The bone which bears it is mostly removed but the inner 



