PLATE IV. (From Bronn, after Gadow.) 



FIG. i. ALLIGATOR MISSISSIPPIENSIS. INNER SURFACE OF THE 



PELVIC REGION, LEFT SIDE. THE PUBIS, ISCHIUM, AND 



VERTEBR/E ARE CUT THROUGH THE MEDIAN PLANE, 



XXVIII, 28th VERTEBRA. 



FIG. 2. HATTERIA PUNCTATA. 



FIG. 3. A. MISSISSIPPIENSIS. THE DEEPEST MUSCLES ON THE 



PLANTAR SURFACE OF THE LEFT HIND FOOT. ROMAN 



NUMERALS IX-XII, SHORT TOE MUSCLES. 



FIG. 4. A. MISSISSIPPIENSIS. LEFT LEG FROM THE POSTERO-MESIAL 



ASPECT. THE PLANTAR FLEXOR MUSCULATURE IN SITU, 



AFTER REMOVAL OF THE GASTROCNEMIUS MUSCLE 



AND THE ASSOCIATED MUSCLES. ROMAN 



NUMERALS, VI-X, SHORT TOE 



MUSCLES. 



amb, ambiens; cap, ext, gastr, external head of gastrocnernius; cap, int, gastr, in- 

 ternal head of gastrocnemius; cd,jm, caudali-femoralis; cd, il, fern, caudi-ilio- 

 femoralis; ex, il, tb, extensor ilio-tibialis; ext, I (long), dig, extensor longus 

 digitorum; jl, tb, ext, flexor tibialis externus; fl, tb, int, flexor tibialis internus; 

 fm, tb, femoro-tibialis; il, cd, ilio-caudalis; il, cost, ilio-costalis; il. Jib, 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 an- 

 terior; peron, post, I 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, Ib, quadratus lumborum; red, rectus abdo- 

 rninis; lib, ant, tibialis anticus; lib, 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, I, pb, lateral process of pubis; pr, tr, trans- 

 verse process; sp, ant, il, anterior spine of ilium; Sy, p, symphysis pubis; 

 Sy, is, symphysis of ischium; Ib, is, tubercle of ischium. 



