_amb_, ambiens; _cap_, _ext_, _gastr_, external head of gastrocnemius; _cap_, _int_, _gastr_, internal head of gastrocnemius; _cd_, _fm_, caudali-femoralis; _cd_, _il_, _fem_, caudi-ilio-femoralis; _ex_, _il_, _tb_, extensor ilio-tibialis; _ext_, _l_ (_long_), _dig_, extensor longus digitorum; _fl_, _tb_, _ext_, flexor tibialis externus; _fl_, _tb_, _int_, flexor tibialis internus; _fm_, _tb_, femoro-tibialis; _il_, _cd_, ilio-caudalis; _il_, _cost_, ilio-costalis; _il_, _fib_, ilio-fibularis; _il_, _fm_ (_il_, _f_), ilio-femoralis; _il_, _s_, _cd_, ilio-sacro-caudalis; _is_, _cd_, ischio-caudalis; _is_, _f_, ischio-femoralis; _ob_, _ext_, obliquus externus; _pb_, _cd_, pubi-caudalis; _pb_, _is_, _tb_, pubi-ischio-tibialis; _pb_, _tb_, pubi-tibialis; _peron_, _ant_, peroneus anterior; _peron_, _post_, peroneus posterior; _p_, _is_, _f_, _ext_, pubi-ischio-femoralis externus; _p_, _is_, _f_, _int_, pubi-ischio-femoralis internus; _p_, _is_, _f_, _post_, pubi-ischio-femoralis posterior; _qudr_, _lb_, quadratus lumborum; _rect_, rectus abdominis; _tib_, _ant_, tibialis anticus; _tib_, _post_, tibialis posticus; _trans_, transversus abdominis; _tr_, _per_, transversus perinei; _m_, _post_, _il_, posterior border of ilium; _ob_, foramen in pubis for the obturator nerve; _o_, _il_, ilium; _o_, _is_, ischium; _o_, _pb_, pubis; _o_, _cl_, cloacal bone; _pr_, _l_, _pb_, lateral process of pubis; _pr_, _tr_, transverse process; _sp_, _ant_, _il_, anterior spine of ilium; _Sy_, _p_, symphysis pubis; _Sy_, _is_, symphysis of ischium; _tb_, _is_, tubercle of ischium. [Illustration] PLATE V. (From Bronn, after Gadow.) FIG. 1. HATTERIA PUNCTATA. (Ventral View.) FIG. 2. ALLIGATOR MISSISSIPPIENSIS. LEFT POSTERIOR EXTREMITY; FOOT IN PRONATION, HENCE SEEN FROM THE DORSAL SIDE. _lg_, _t_, _f_, LIGAMENTUM TIBIO-FIBULARE. FIG. 3. A. MISSISSIPPIENSIS. MUSCLES OF THE DORSAL SURFACE OF THE LOWER LEG AND FOOT.