8li 



iii:\ i:i,iii'.Mi,M oi-- riiK skki.ktox or 'I'lu-: ji/A'i'.vjtA. 



PLATK M. 



SpHENOUON ru NCTATUS. CKAMO-FACIAL MKMr.HANK-BONES ANO Al'l'E.VUK LLAK SKKIJCTOX. 



ac, acetaljuluiii ; ati., iingular; c, centrale ; c.i.p., ischio-pubic cartilage; cL, clavicle; 

 cor., coracoid : corJ, .sulcus coracoidcus ; ror.", foramen for supracoracoirleus 7ierve; d., dentary ; 

 e., epipubis; ep., epiphysis; F., fibula; /., fibuliire ; f.b., foramen for artcria perforaus raesopodii; 

 f.c, foramen cordiforme ; f.cc, ectepicondylar foramen; f.en., entepicoiidyiar foramen; f.o., obtu- 

 rator foramen; fr., frontal; g.f., glenoid fossa; hp., liypoischiuin ; i., intermedium; i.e., iuter- 

 clavicle; //., ilium; is., ischium ;>., jugal ; l.i.p., ischio-pubic ligament (ligamentum medianuui 

 jjclvis) ; m.l., mctischial process; mn., meniscus tarsale ; mx., maxilla; mx.' , maxillary process; 

 us., nasal; p., parietal; jm., palatine; ph., pubis; 2>b-' , prepubic process; p.f., prefrontal; py., 

 pterygoid ; pi., pisiform ; p.o., postorbital ; po.c, postaxial ceutrale ; po.f., postf rontal ; pr.c, 

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

 r</., radiale ; r J., trunk rib ; *., sternum ; s.«., supra-angular; sc, scapula ; sc.', acromial process ; 

 sd' , suprascapula ; se., sesamoid; s.mx., septo-maxillary ; s.n., poststernal uoteli ; sp., splenial ; 

 *<7., squamosal; sq."., posterior process of squamosal; T., tibia; t., tibiaJe; /.r;., tarsal centrale; 

 t.p., transpalatine; U., ulna; v., ulnarc; j;o.j vomer; I.-V., metacarpals and metatarsals; 

 1-5, carpals and tarsals. 



Fi, 

 Fi 



' 'o- 



/^. 



l''ig. 



3. 



Fig. 



4. 



Fig. 



5. 



Fig. 



G. 



Fig. 



7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



Fig. 



11. 



Fig. 



12. 



Fig. 



13. 



1. Stage S. The membrane. hones : — Bones from roof of skull and side of head. x 5 



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

 Stage S. The same: — Bones fi'om lower jaw. x ."). 

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



X 25. 



Stage li. Pectoral girdle and sternum, : — Ventral aspect. x 8. 



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



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



Stage K. Pelvic girdle : — Ventral aspect. x o. 



Stage T. Pelvic girdle : — Ventral aspect. x 2. 



Stage Q. Humervs : — Distal end, ventral aspect (from wax model). x 15. 



Stage Q. Right carpus : — Horizontal section. x 20. 



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

 Stage T. Left caroms : — Doi-sal aspect, showing abnormal condition of centralia from 



same animal as fig. 10. 



Fig. 14. Small Adult. Right carpus : — Dorsal aspect. 



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



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



Fig. 17. Stage R. L(ft tarsus : — Horizontal section. 



Fig. 18. Adult. Right tar.sv^ : — Dorsal aspect. 



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



X 4. 



X 2. 

 X 20. 

 X 20. 

 X 15. 



X 2. 



X 2. 



