PLATE XXII. 



(The cost of this plate has been defrayed by the Carnegie Trust for the Universities 



of Scotland.) 



All the specimens figured on this plate are from the Borough Lee Ironstone, Loanhead, 



near Edinburgh. 



Fig. 



1. Cryphiolepis striatus, Traquair; natural size. Hunter Collection in the Public 



Museum, Kilmarnock. 



2. Impression of the outer surface of the maxilla of the same species; magnified by 



one half. Collection of the Author. 



3. Impression of the outer surface of the dentary element of the mandible ; magnified 



by one half. Collection of the Author. 



4. External surface of a typical scale from the flank ; magnified two diameters. 



5. Specimen of Drydenius insignis, Traquair; natural size. Royal Scottish Museum. 



6. Maxilla of the same species, with teeth, seen from the inner surface ; magnified three 



diameters. Collection of the Author. 



7. Splenial element of mandible, seen from the external or aboral surface ; magnified 



four diameters. Collection of the Author. 



8. Splenial element, seen from the internal or oral aspect ; magnified three diameters. 



Collection of the Author. 



9. Flank scale from the specimen represented in fig. 5 ; magnified six diameters. 



