PLATE LIX. 



PAGE. 



Fig. 1. Ctenacanthus fokmosus, Newb 53 



Xatural size, 

 la, 16, Ic. Transverse sections of spine. 

 Id, le. Surface markings. Enlarged. 



Fig. 2, Ctenacanthus furcicarinatus, Newb 54 



Base of spine. Natural size. 

 2a, 2b. Transverse sections. 

 2c. SurlUce markings. Enlarged. 



Fig. 8. Ctenacanthus parvuh'r, Newb 55 



Entire spine. Natural size. 



Fig. 4. Dermal Tubercles of Ctenacanthus ? 54 



Found witli fig. 2. 



Fig. 5. LisTRACANTHUs HYSTRix, N. and W 66 



A small specimen. Natural size. 



Fig. 6. LisTRACANTHUS HiLDRETHi, Newb 56 



Summit of spine. Natural size. 



Fig. 7. Orthocanthus gracilis, Newb 56 



A rather large specimen. Natural size. 



Fig. 8. DiNicHTHYs Terrelli, Newb 28 



Supra-occipital plate, inside. Natural size. 



Fig. 9. DiNiCHTHYS Hertzeri, Newb 28 



Supra-occipital plate, inside. Half natural size. 



Fig. 10. Supra-occipital and Dorsal Plates of Heterostius 14 



Inside, much reduced. After Pander. 



Fig. 11. SUPRA-OCCIPITAL AND DORSAL PlATES OP ASTEROLEPIS 14 



Inside, much reduced. After Pander. 



Fig. 12, Platyodus lineatus, Newb 58 



Crown surface of tooth. Natural size. 



Fig. 1:J. Ptyctodus calceolus, N. and W 59 



Side view. Natural size. 

 13«. Upper surface. Natural size. 

 Vdb. Profile section. Natxtral size. 



