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TYPES OF AXIAL DUPLICATION
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Aldrovandi Amaral Amer animal Anon appeared axial duplication Bascanium constrictor Betta body Bonnaterre Borgert Bothrops atrox bull snake Butantan Institute Cantoni cephalic College of Surgeons Coluber natrix concerning this specimen Cunningham degree of bifurcation described and figured deux tetes dicephalic dicephalism Ditmars dorsal view double double-headed snake DUPLICATION IN SERPENTS embryonic discs examination fer-de-lance fused fusion garter Geoffroy-St.-Hilaire headed snake Heasman Hyde imen inches in length inches long Johnson Lacepede Lanzoni left head mentioned milk snake Mitchill monster mouth Museum of Comparative Natrix sipedon Natural History neck normai observed Ophibolus getulus Originai Photographic copy PLATE posterior probably recorded reported reproduced reptiles right head Ringed snake Royal College serpents single yolk sirtalis skulls spec species Strohl tail taken Thamnophis three-headed tion triangulum two-headed serpent two-headed snake U. S. National Museum ventral vertebrae vertebral column viper Vipera aspis water snake Wettstein Wyman X-ray photograph York Zoological Park