OCR Text |
Show 18 MESSRS. F. E. BEDDARD AND F. TREVES ON THE [Jan. 15, Hyrax possesses in addition an extensor carpi ulnaris, which is wanting in the Ungulates. In Hyrax the extensores primi, secundi internodii, and indicis are wanting, which is so far a resemblance to the Ungulate in that the last two of these muscles are present in the Rabbitl and apparently in flydromys. The supinator longus, which we have described in the Rhinoceros, is absent in the Horse, and according to Meckel, quoted by Messrs. Murie and Mivart, in many Rodents. Windle2 asserts its absence in Hydromys, and Huxley in the Rabbit. Its presence in Hyrax is therefore of particular interest and also its presence in the Tapir. Muscles of the Hind Limbs (figs. 6, 7, 8, 9). Lliacus.--This muscle is largely tendinous upon the inner side; its origin is from the whole of the iliac fossa. Psoas.-A small muscle dividing into two tendons ; both are inserted into lesser trochanter, curving round femur from before back. Psoas parvus.- The upper part of the belly is muscular but soon becomes tendinous; it is continuous with the sartorius (see fig- 7). Gracilis.-The gracilis is enormously wide and muscular throughout ; it arises from pubic arch and is inserted by a large muscular and tendinous insertion into fascia above the inner side of the knee, which is continued on to patella and then on to inner side of tibia. Pectineus is a fleshy, somewhat flat oblong-shaped muscle ; it arises from pubis along pectineal line ; it is inserted on to the femur as in the Horse. Adductor longus.-Arises from ramus of pubis, where it is blended with adductor magnus; its insertion is the same as that of the gracilis, except that it also is attached to the lower end of the femur ; it is partly covered by gracilis. Adductor magnus is a large fleshy muscle with but little tendon ; its origin is muscular and it is here fused with adductor longus as already stated ; its insertion is to inner side of shaft and to inner condyle of femur ; it forms a tendinous arch for artery at junction of middle and lower third. The Rectus and two Vasti were fused into a single muscle, the elements of which were indicated by aponeuroses ; the muscle is inserted on to patella. Semimembranosus.--This muscle is united to form one muscle with the semitendinosus; it is inserted by a flat teudon parallel with and } inch behind the crest of tibia ; this tendon is three inches long. The Peronei muscles are four in number :- (1) Originates from the outer side of the head of the fibula and 1 Huxley, ' Anatomy of Vertebrates' p. 439 P. Z. 8. 1887, p. 56. |