FIG. 1. _1_, humero-radialis longus (supinator longus); _2_, humero-radialis medialis (flexor carpi radialis); _3_, carpo-phalangei I digiti V; _4_, carpo-phalangei (flexor digitorum communis brevis); _5_, humero-ulno-phalangei (flexor digitorum communis profundus); _6_, humero-radialis longus; _s._ flexor carpi ulnaris; _7_, pisiforme-phalangeus primus digiti V; _8_, carpo-phalangeus I; _9_, carpo-metacarpalis I. FIG. 2. 1-5 as in FIG. 1; _a_, humero-carpi-radialis; _b_, humero-metacarpalis III, IV, V (extensor digitorum longus); _c_, humero-carpi-ulnaris; _d_, carpo-phalangei (extensor-digitorum brevis). FIG. 3. _a_, _b_, humero-ulno-phalangei (flexor digitorum communis profundus). FIG. 4. _a_, ulno-carpi-radialis; _b_, ulna; _c_, humero-ulnaris-lateralis (flexor carpi ulnaris); _d_, humero-radialis brevis (supinator brevis). FIG. 5. HEAD, NECK, AND A PART OF THE BODY OF A CROCODILUS VULGARIS. (Ventral View). _a_, lower jaw; _b_, upper jaw; _c_, arch of palate; _d_, fold of palate; _h_, pterygoideus internus (Rathke); _i_, pterygoideus externus (Rathke); _k_, longus colli (Rathke); _m_, rectus capitis anticus major (Rathke); _n_, sterno-mastoideus (Rathke); _o_, levator scapulæ (Rathke); _p_, scalenus (Rathke). FIG. 6. PART OF A SIMILAR PREPARATION OF C. RHOMBIFER. _a_, the hindermost of the superior maxillary teeth; _b_, lower jaw; _c_, wings of palate; _d_, pterygoid; _e_, quadrate; _g_, intertransversalis (Rathke); _h_, trachelomastoideus (Rathke); _i_, levator scapulæ (Rathke); _k_, longus colli (Rathke); _m_, pterygoideus externus (Rathke); _n_, rectus capitis anticus major (Rathke). FIG. 7. A PART OF THE HEAD AND NECK OF ALLIGATOR LUCIUS. _a_, pterygoideus externus (Rathke); _b_, digastricus (Rathke); _c_, rectus capitis anticus major (Rathke); _d_, sterno-mastoideus, anterior belly (Rathke); _e_, sterno-mastoideus, posterior belly (Rathke); _f_, levator scapulæ (Rathke); _g_, cervicalis adscendens (Rathke); _h_, longus colli (Rathke); _i_, intertransversalis (Rathke); _k_, trachelomastoideus (Rathke); _l_, biventer cervicis (Rathke); _m_, splenius colli (Rathke); _n_, splenius capitis (Rathke). [Illustration] PLATE III. FIG. 1. MUSCLES OF THE POSTERIOR EXTREMITY OF ALLIGATOR MISSISSIPPIENSIS. LEFT SIDE, VENTRAL (PLANTAR) SURFACE. FIG. 2. THE SAME, DORSAL AND LATERAL SURFACES. FIG. 3. A. MISSISSIPPIENSIS; THE TENDONS OF THE FLEXOR TIBIALIS MUSCLE IN THEIR RELATION TO THE GASTROCNEMIUS MUSCLE. RIGHT LEG, INNER SURFACE. (FIGS. 1-3 from Bronn, after Gadow.)