52 2 THE ORIGIN OF VERTEBRATES 



Ccelom, 167, 251, 400, 472, 481 

 Ccelomata, 472 

 Coelomoccela, 472, 475 

 Coeloinostomes, 477, 481 

 Colleneytes, 474 

 Commissure, anterior, 49 



„ oesophageal, 14 



„ posterior, 48, 280 



Comparison of brains of Ammocoetes and Arthropod, Gl 



,, ,, invertebrate from Branchipus to Ammocoetes, 54 



„ ,, vertebrate, 40 



„ branchial circulation in Ammocoetes and Limulus, 174 



„ ,, lamellse of Scorpion and Ammocoetes, 175 



,, ,, segments of Ammocoetes and Petromyzon, 169 



,, Cephalaspidian and Palaeostracan fish, 31 



,, Ccelom of Peripatus and Vertebrate, 400 



., dermal covering of Pteraspis with chitin of Limulus or dentine of fish 



scales, 346 

 ,, entosternite or plastron of Limulus with trabeculse of Ammocoetes, 



145 

 ,, excretory organs of vertebrates and invertebrates, 389 



,, gut of Arthropod and tube of central nervous system of Vertebrate, 43, 



244, 433, 440, 455, 457 

 ,, head-shield of Cephalaspis and Ammocoetes, 291, 329, 338 



,, hypophysial tube with olfactory tube of Arthropod ancestor, 229 



,, ,, ,, with position of pala;ostoma, 317 



,, mesosomatic region of Ammocoetes and Eurypterus, 192 



,, muscles, branchial, of Ammocoetes and appendage muscles of Scorpion, 



171, 447 

 ,, ,, eye, of Vertebrate with dorso-ventral muscles of Scorpion, 



267, 272, 459 

 ,, ,, of oral chamber of Ammocoetes and prosomatic musculature 



of Limulus, 247, 447 

 ,, ,, longitudinal body-muscles of Vertebrate and dorsal longi- 



tudinal muscles of Arthropod, 411, 447 

 ,, nerves, appendage of Limulus and Branchipus to lateral root system 



of Vertebrate, 157 

 ,, ,, cranial and spinal segmental, 152 



,, nervous systems of Vertebrate and Arthropod, 36 



,, pineal gland of vertebrates and median eyes of Arthropod, 63, 456 



,, pituitary body and coxal glands, 246, 319, 321 



,, prosoma and mesosoma of Limulus and Ammocoetes, 140, 141 



,, prosomatic region of Ammocoetes and Eurypterus, 244, 333 



,, retina in Ammocoetes and Musca, 97 



,, ,, compound in Arthropod and Vertebrate, 87 



,, skeleton of Limulus and Ammocoetes, 126, 136 



,, sense-organs of Arthropod appendages with auditory organs of 



Vertebrate, 375 

 ,, thyroid with endostyle, 198 



,, ,, ,, uterus of Scorpion, 205 



Corneagen, 69 

 Corpora quadrigemina, 47 



