﻿PLATE VII. 



Fig. 1. Bones of head and shoulder-girdle of the recent Polyodon folium, Lacep., from 

 a moist preparation ; the cartilaginous portions are dotted : n., nasal chamber, behind 

 which is the eyeball ; sq., squamosal ; h. m., hyomandibular ; sy., symplectic ; p. q., 

 palato-quadrate cartilage ; M., Meckelian cartilage of lower jaw; pa., palatopterygoid ; 

 mx., maxilla; d, dentary of lower jaw; c. //.., ceratohyal; op., operculum; br., branchi- 

 ostegal ray ; s. cl., supra-clavicular ; p. cl., post-clavicular ; cl., clavicle ; i. cl., infra- 

 clavicular. 



Fig. 2. Palatoquadrate arch of the same Fish with the jaws, seen from the inner 

 aspect : L. M., levator muscle of the lower jaw (removed in the preceding figure) ; sp. 

 splenial element of lower jaw. The other lettering as in Fig. 1. 



Fig. 3. Tail of Polyodon folium. From a dried specimen. 



Fig. 4. Monichthys striolatus, Agass., sp., natural size, from a specimen from Burdie- 

 house, in the Hugh Miller Collection, Edinburgh Museum of Science and Art. 



Fig. 5. Dorsal fin, natural size, of a larger specimen from Kingscraig, Fifeshire, in 

 the Museum of the New College, Edinburgh. The fin is so split that the internal 

 surface of the left set of derairays is that which is exhibited. 



Fig. G. Outer sculptured surface of some of the rays of the anal fin of the same 

 specimen, magnified 4 diameters. From a squeeze in modelling wax. 



Fig. 7. Right ramus of the lower jaw, with remains of branchiostegal rays, of a 

 specimen from Burdiehouse in the Hugh Miller Collection. Enlarged 2 diameters. 



Fig. 8. Two teeth from the counterpart of the same specimen, enlarged 10 diameters. 



Fig. 9. One of the large scales (enlarged 2 diameters) in front of the dorsal fin of the 

 specimen from Kingscraig, from which Figs. 5 and 6 were taken. 



Fig. 10. The large scales in front of the anal of the same specimen, also enlarged 

 2 diameters. The two lateral scales are displaced. 



Fig. 11. One of the highly ornate scales from near the nape of the neck in a 

 specimen from Burdiehouse, magnified 6 diameters. 



Fig. 12. Scale from the flank of the large specimen from Kingscraig referred to 

 above, magnified 4 diameters. This illustrates the prevailing type of scale-ornament in 

 this species. 



Fig. 13. Under surface of a similar scale, enlarged 4 diameters. 

 Fig. 14. Scale from the tail-pedicle, before the commencement of the caudal fin, of 

 the same specimen, enlarged 4 diameters. 



Fig. 15. Under surface of a similar scale, also enlarged 4 diameters. 



