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Show 1867.] MYOLOGY OF IGUANA TUBERCULATA. 793 Deepest muscles of right thigh; ventral aspect. The gracilis is entirely removed. The tibial adductor, the semimembranosus, and the adductor magnus are cut short and reflected. A. Adductor magnus. B. F. Biceps femoris. C. Crureus. F. C. Femoro-caudal. Go. 1. Gastrocnemius internus. 7. P, Ilio-peroneal. O. E. Obturator externus. O.I. Obturator internus. Pc. 1-3. Pectineus. Pf. Pyriformis. S. F. Rectus femoris. S. Tibial adductor. S. M. Semimembranosus. S. T. Semitendinosus. V. I. Vastus internus. y. Tendon of insertion of femoro-caudal given off from the larger tendon and going to the popliteal space. Obturator externus*. This is very fleshy, and arises from the ischium and the outside of the obturator membrane (fig. 17, O.E.). It is inserted into the trochanteric fossa immediately above the summit of the insertions of the gluteus medius and pyriformis. The obturator inte?-nusf (fig. 17, O.I.) arises from the posterior part of the deep surface of the ischium. Curving round the outer margin of that bone (between the acetabulum and the tuberosity), it is inserted, by an exceedingly strong tendon, into a pit on the outer side of the articular head of the femur. Pyriformis (figs. 15 & 17, Pf). This muscle X arises from the under surfaces of the first four caudal transverse processes, between the large femoro-caudal muscle on the inside and the conjoined insertions of the two median series of lateral caudal cones on the outside. It is inserted into the strong tendinous arch passing from the ilium to the pubis and enclosing the tendon of the femoro-caudal muscle. Thence taking fresh origin, and accompanied by an anterior fasciculus coming direct from the caudal vertebrae, it is finally * This appears to answer to the m. quadratus femoris of Stannius (p. 134. no. 10). f The obturator internus of Stannius (loc. cit. p. 134. no. 5) is a part of m y iliacus. t It is the m. subcaudalis of Stannius (loc. cit. p. 133. no. 4). PROC. ZOOL. Soc-1867, No. LI. |