PLATE XXIII. 



Fig. 



1. Head of Bothriolepis major: natural size; bony substance preserved; from 



Newton Quarry, near Elgin. The extra-lateral and angular plates are 

 wanting, as are also the pieces which should occupy the orbital space. 



2. Median occipital plate; natural size; bony substance preserved. From the 



same locality. 



3. Pre-median plate ; natural size ; bony substance preserved. From the same 



locality. 



1 . A large portion of the right lateral plate of the head ; natural size ; bony 

 substance preserved, and showing well the sensory groove with its antero- 

 lateral branch. From Whitemire, near Forres. 



5. Natural size representation of a plaster mould of a sharp impression of a head 

 with the anterior parts of the dorsal plates. On the right side the continuity 

 of the lateral sensory groove of the head with that on the anterior dorso- 

 lateral plate is distinctly seen. The original from Alves, near Elgin, was 

 presented to the Royal Scottish Museum by the Rev. Mr. McKemmie. 



(i. Anterior median dorsal plate; natural size; from a plaster mould of an 

 impression from Alves ; slightly deficient on the left side. Original in the 

 Elgin Museum. 



7. Greater part of the right ventro-lateral plate, showing the entire brachial 

 process (b.p.), and the external sculpture in which the stellate character of 

 the tubercles happens to be well seen. Natural size. From Whitemire, 

 near Forres. 



The originals of all the above figures, except fig. 6, are in the Royal Scottish 

 Museum, Edinburgh. 



