FIG. 3. DEEP LAYER OF THE INNER SHOULDER MUSCLES AFTER REMOVAL OF THE HUMERUS AND ITS MUSCULATURE AS WELL AS THE COLLO-SCAPULARIS SUPERFICIALIS MUSCLES (_cssp_) AND THORACI-SCAPULARIS SUPERFICIALIS MUSCLES (_thcsp_). FIG. 4. SHOULDER MUSCLES AFTER REMOVAL OF THE PARS SCAPULARIS OF THE SUPRA-CORACO-SCAPULARIS (_sps_) AND OF THE BICEPS MUSCLE (_b_). FIG. 5. DIFFERENT VIEW OF FIG. 4. FIG. 6. SHOULDER MUSCLES AFTER REMOVAL OF THE PARS CORACOIDEA OF THE SUPRA-CORACO-SCAPULARIS (_spc_) AND DELTOIDES SCAPULARIS SUPERIOR (_dss_) MUSCLES. LETTERING FOR ALL FIGURES OF THIS PLATE. _acs_, _ahl_, _ahp_, _asl_, coraco-scapular, humerale laterale, humerale posticum, and scapulare laterale externum heads of the anconæus muscle; _b_, coraco-antebrachialis (biceps); _c_, coracoid; _cbb_, coraco-brachialis; _cc_, costo-coracoideus; _Cl_, clavicle; _cssp_, collo-scapularis superficialis (levator scapulæ superficialis); _cst_, capiti-sternalis (sterno-mastoideus); _cthspr_, collo-thoraci-scapularis profundus (levator scapulæ and serratus profundus); _cu_, dorso-scapularis (cucullaris); _dh_, dorso-humeralis (latissimus dorsi); _dsi_, deltoides scapularis inferior; _dss_, dorsalis scapulæ (deltoides scapularis superior); _Ec_, epicoracoid; _Est_, episternum; _esthy_, episterno-hyoideus; _H_, humerus; _hai_, humero-antebrachialis inferior (brachialis inferior); _hr_, humero-radialis; _p_, pectoralis; _PL_, processus lateralis humeri; _PM_, processus medialis humeri; _R_, radius; _rh_, rhomboideus; _S_, scapula; _sbsc_, subscapularis; _shpr_, scapulo-humeralis profundus; _spc_, supra-coraco-scapularis; _sphc_, sphincter colli; _SpS_, spina scapulæ; _SS_, suprascapulare; _St_, sternum; _Sta_, anterior part of sternum; _Stp_, posterior part of sternum; _thssp_, thoraci-scapularis superficialis (serratus superficialis); _U_, ulna; _V₅_, _V₆_, 5th and 6th vertebræ. NERVES SHOWN IN THIS PLATE. 3_a_. thoracicus VII. 7. posterior branch of the thoracicus superior VII for the collo-thoraci-suprascapularis profundus and rhomboideus muscles. 7_a_. proximal. 7_b_. distal thoracicus superior VII. 10_a_. thoracicus inferior. 12. supra-coracoideus. 15. integumental, (13 and 14), muscular branch of the supra-coracoideus. 19. pectoralis. 21. brachialis longus inferior. 29_b_. teres major. 31. dorsalis scapulæ (posterior). 32. cutaneus brachii and antebrachii superior lateralis. 32_a_. humero-radialis. 33. deltoides inferior, (25 and 42), cutaneus brachii and antebrachii medialis. [Illustration] PLATE II. FIGS. 1-4. MUSCLES OF THE FOREARM OF THE ALLIGATOR. (From Bronn.) FIGS. 5-7. (From Bronn after Rathke.)