LIST OF ILLUSTRATIONS. 



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The "Lancelet," Branchiostoma lanceolatum (recent) 

 The "Hag-fish," Myxine australis (recent) 

 Mouth of " Lamprey," Petromyzon fluviatilis (recent) 

 "Conodonts" from the Cambrian X 10 times nat. size 



" Diphycercal," or primitive form of tail . 



"Heterocercal," or ancient form of tail 



" Homocercal," or modern form of tail 

 The " Port- Jackson Shark," Cestracion galeatus (recent) 

 Posterior dorsal spine of ditto ditto ditto 



Spine of Chimcsra monstrosa, Liun. (recent) 

 Dorsal spine of Ilyhodas, Lias, Lyme Regis 



Ditto ditto Lepracanthus Colei, Coal M., Ruabon . 

 Portion of Spine of Edestcs vorax ditto Illinois . 

 Upper Jaw of Port-Jackson Shark, Cestracion galeatus (recent) 

 Side view of Jaws of ditto ditto ditto 



Teeth of Cochliodus contortus, Carbonif s. L. , Armagh . 

 Central Teeth of Janassa linguceformis, Coal-measures 

 Five palatal Teeth of Acrodus from the Lias of Lyme Regis 

 Tooth of Lamna elegans, London Clay 



Ditto Carcharodon megalodon, Suffolk Crag . 

 Jaws of Male and Female Skate, Raja clavata (recent) 

 Dermal spines of "Thornback," Raja clava ta ditto . 

 Raja Murrayi (recent), Kerguelen's Island 

 Acanthodes, sp. Permian, Lebach (restored), after Kner and 

 Diplacanthus striatus, Old Red Sandstone, Cromarty . 

 Pterichthys Miileri (restored after Pander), Devonian . 



Ditto cornutus, Old Red Sandstone . 

 Coccosteus (side view), after Pander, Old Red Sandstone 



Ditto decipiens (dorsal aspect) ditto 



Cephalaspis Lyelli, side view restored (after Lankester), Old 

 stone, Forfarshire ....... 



Cephalaspis Lyelli, dorsal aspect, Old Red Sandstone, Forfarshire 

 "The Australian Mud-fish," Ceratodus Forstcri (recent), Australia 



Dipterus macrolepidotus, Devonian 



Polypterus bichir (recent), Rivers of Africa 



" The African Mud-fish," Protopterus anncctens (recent), living 



rivers of Africa 



Holoptychlus (restored after Huxley), Old Red Sandstone 

 Tooth of Strepsodtbs, Coal-measures ..... 



Roc 



Red 



m 



er 



Sand 



in the 



PACK 



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