3IO REV. S. GRAHAM BIRKS 



relations of the bones in these areas ; it seems probable, 

 however, that parts of two sub-orbitals are represented by the 

 bones lying in the space between the right maxilla and the 

 frontals, while suggestions regarding the others are shewn in 

 the key to the photograph of the dorsal aspect of the skull. 



Other bones are probably as follows : Still more towards 

 the posterior end on the right side lies the operculum, whose 

 posterior border is obscured by the displaced right supra- 

 temporal. The large operculum on the left side is covered by 

 the left supra-temporal, which is almost in its natural position. 

 If this determination of the supra-temporals be correct it will 

 be noted that there are two. 



Traces of a sub-operculum are perhaps to be seen on the 

 left posterior border of the specimen. 



In a median posterior position a few scales can be made 

 out, while the right posterior portion of the fossil exhibits part 

 of a large fulcral scale of the right pectoral fin, of which parts 

 of some of the fin-rays are seen in position. On the right of 

 this portion of the specimen is to be seen a series of scales 

 associated with the fin-lobe. A fulcral scale of the left pectoral 

 fin is perhaps represented by a fragment on the left posterior 

 margin of the specimen. 



The under surface of the fossil exhibits no new features 

 except the limited number of lateral jugular plates which are 

 present. 



Megalichthys coccolepis: B2*, portion of skull. 

 (Plate XII., fig. 2.) 



Among other interesting representatives of the genus is 

 B2*. The bones of this specimen, part of the skull of 

 M. coccolepis, are similar in size to those of the skull of 

 M. hibberti previously described from the same museum. The 

 left parietal is well preserved, while the posterior portion of 

 its fellow is broken off. The post- frontal and squamosal are 

 clearly separated by suture from one another. One small 



