80 DEVELOPMENT OF THE SKELETON OF THE TUATAIiA. 



PLATE VI. 

 SPHENODON PUNCTATUS. CRANIO-FACIAL MEMBRANE-BONES AND APPENDICULAR SKELETON. 



ac., acetabulum ; an., angular ; c., centrale ; c.i.p., ischio-pubic cartilage j cl., clavicle ; 

 cor., coracoid ; cor.', sulcus coracoideus ; cor.", foramen for supracoracoideus nerve ; d., deutary ; 

 e., epipubis ; ep., epiphysis; F., fibula; /., fibulare ; f.b., foramen for arteria perforans mesopodii; 

 f.c., foramen cordiforme ; f.ec., ectepicondylar foramen ; f.en., entepicondylar foramen ; f.o., obtu- 

 rator foramen; Jr., frontal; g.f., glenoid fossa; hp., hypoischium ; i., intermedium; i.e., inter- 

 clavicle; il., ilium; is., ischium ; j., jugal ; l.i.p., ischio-pubic ligament (ligamentum medianutn 

 pelvis); m.i., metischial process; mn., meniscus tarsale; mx., maxilla; mx.', maxillary process; 

 ns., nasal ; p., parietal ; pa., palatine ; ph., pubis ; pb.' , prepubic process ; p.f., prefrontal ; pg., 

 pterygoid ; pi., pisiform; p.o., postorbital ; po.c., postaxial centrale; po.f., postfrontal; pr.c., 

 preaxial centrale; pro. 1., proximal tarsal ; px., premaxilla ; q.j., quadrato-jugal ; R., radius; 

 rd., radiale ; r.t., trunk rib ; *., sternum ; s.a., supra-angular ; sc., scapula ; sc.', acromial process ; 

 sc.", suprascapula ; se., sesamoid; s.mx., septo-maxillary ; s.n., poststernal notch; sp., splenial; 

 sq., squamosal ; sq."., posterior process of squamosal ; T., tibia; /., tibiale; t.c., tarsal centrale; 

 t.p., transpalatine ; U., ulna; u., ulnare; vo., vomer; I.-V., metacarpals and metatarsals ; 

 15, carpals and tarsals. 



Fig. 1. Stage S. The membrane-bones : Bones from roof of skull and side of head. x 5 



Fig. 2. Stage S. The same : Bones from roof of mouth. x 5. 



Fig. 3. Stage S. The same: Bones from lower jaw. x 5. 



Fig. 4. Stage Q. Pectoral girdle and sternum : Longitudinal section with developing clavicle. 



x 25. 



Fig. 5. Stage R. Pectoral girdle and sternum : Ventral aspect. x 8. 



Fig. 6. Stage T. Pectoral girdle and sternum: Ventral aspect. x 2. 



Fig. 7. Stage Q. Pelvic girdle: Ventral aspect (from wax model). x 8. 



Fig. 8. Stage R. Pelvic girdle : Ventral aspect. x 5. 



Fig. 9. Stage T. Pelvic girdle : Ventral aspect. x 2. 



Fig. 10. Stage Q. Humerus : Distal end, ventral aspect (from wax model). x 15. 



Fig. 11. Stage Q. Right carpus : Horizontal section. x 20. 



Fig. 12. Stage T. Right carpus : Dorsal aspect, showing normal condition of centralia. x 4. 



Fig. 13. Stage T. Left carpus : Dorsal aspect, showing abnormal condition of centralia from 



same animal as fig. 10. x 4. 



Fig. 14. Small Adult. Right carpus : Dorsal aspect. x 2. 



Fig. 15. Stage Q. Left tarsus: Early period, horizontal section. x 20. 



Fig. 16. Stage Q. Right carpus: Late period, horizontal section. x 20. 



Fig. 17. Stage R. Left tarsus : Horizontal section. x 15. 



Fig. 18. Adult. Right tarsus : Dorsal aspect. X 2. 



Fig. 19. Adult. Portion of left tarsus : Dorsal aspect, showing ulnar sesamoid. X 2. 



