$6 DEVELOPMENT OF THE SKELETON OF THE TUATARA. 
PiPAh, Wie 
SPHENODON PUNCTATUS.—CRANIO-FACIAL MEMBRANE-BONES AND APPENDICULAR SKELETON. 
ac., acetabulum; an., angular; ¢., centrale; c.i.p., ischio-pubie cartilage; cl., clavicle ; 
cor., coracoid ; cor.', sulcus coracoideus ; cor.", foramen for supracoracoideus nerve; d., dentary ; 
e., epipubis ; ep., epiphysis; F., fibula; /., fibulare; f.6., foramen for arteria perforans mesopodii ; 
f.c., foramen cordiforme ; f.ec., ectepicondylar foramen ; f.en., entepicondylar foramen ; f.0., obtu- 
rator foramen ; fr., frontal; g.f., glenoid fossa; hp., hypoischium ; é., intermedium;~ i.c., inter- 
clavicle; i/., ium; és., ischium; j., jugal; /.i.p., ischio-pubic ligament (ligamentum medianum 
pelvis) ; m.i., metischial process ; mn., meniscus tarsale; mx., maxilla; ma.’, maxillary process ; 
ns., nasal; p., parietal; pa., palatine; pb., pubis; pd.’, prepubic process; p,f., prefrontal ; pg., 
pterygoid ; pi., pisiform; p.o., postorbital; po.c., postaxial centrale; po,f., postfrontal; pr.c., 
preaxial centrale; pro.t., proximal tarsal; px., premaxilla; g.j., quadrato-jugal; R., radius; 
rd., vadiale ; r.¢., trunk rib ; s.,sternum; s.a., supra-angular; sc., scapula; sc, acromial process ; 
se.!, suprascapula ; se., sesamoid; s.mz., septo-maxillary ; s.”., poststernal notch; sp., splenial ; 
sq., squamosal ; sq.'”., posterior process of squamosal; 7., tibia; ¢., tibiale; ¢.c., tarsal centrale; 
t.p., transpalatine; U., ulna; w., ulnare; vo., vomer; I.-V., metacarpals and metatarsals ; 
1-5, carpals and tarsals. 
Fig. 1. Stage 8. The membrane-bones :—Boues from roof of skull and side of head. x 5 
lig. 2. Stage S. The same :—Bones from roof of mouth. x 5 
Fig. 3. Stage S. The same :—Bones from lower jaw. <a 
Fig. 4. Staye Q. Pectoral girdle and sternum:—Lougitudinal section with developing clavicle. 
x 25. 
Fig. 5. Stage R. Pectoral girdle and sternum :—Ventral aspect. 4K 8. 
Fig. 6. Stage T. Pectoral girdle and sternum :—Ventral aspect. xe 
Fig. 7. Stage Q. Pelvic girdle :—Ventral aspect (from wax model). »< teh 
Fig. 8. Stage R. Pelvic girdle :—Ventral aspect. Xe 1 
Fig. 9. Stage T. Pelvic girdle :—Ventral aspect. Xiao 
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. 138. 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. Xd. 
Fig. 15. Stage Q. Left tarsus :—Early period, horizontal section. x 20. 
Fig. 16. Stage Q. Right carpus :— ate period, horizontal section. x 20. 
Fig. 17. Stage R. Left tarsus :—Horizontal section. 5 lis. 
Fig. 18. Adult. Right tarsus :—Dorsal aspect. xX 2. 
Big. 19. Adult. Portion of left tarsus :—Dorsal aspect, showing ulnar sesamoid. x 2, 
