the Wombat and Tasmanian Devil. 167 



gluteus medius, it is inserted into the femur at the posterior 

 and external part of the great trochanter. In Macropus 

 Bennettii it arises from the upper three caudal vertebra, and is 

 closely united to the gluteus maximus. In the Giant Kangaroo, 

 Phalangista, and Didelphys it is similar, but less easily sepa- 

 rated from the gluteus maximus. 



The gluteus minimus is hardly separable from the medius 

 in Sarco2)hihis, less so in the Wombat, but quite distinct in 

 the Giant Kangaroo, Wallaby, Fhalangista, Opossum, and 

 Peratneles. 



The gluteus quartus in tlie Wombat arises from the outer 

 side of the anterior inferior spine of the ilium, external to the 

 origin of the rectus, and is inserted into the front of the 

 great trochanter. In Sarcopliilus the attachments are similar, 

 and the muscle is very distinct. In the Giant Kangaroo it 

 arises below and in front of the gluteus minimus and behind 

 the rectus femoris, and is inserted below the summit of the 

 great trochanter ; it is flat and cleft into two parts in Macropus 

 Bennettii^ which are nearly equal ; it is also present in the 

 Phalanger, but small ; it is more distinct in the Opossum. 



The pyriformis muscle is a slip separated from the gluteus 

 medius by the gluteal nerve, and arises inside the pelvis 

 from the front of the sacrum, and is inserted into the summit 

 of the trochanter ; it is separate in the Wombat and Sarco- 

 jykilus, but not nearly so large proportionally as in Macropus 

 giganteuSj ruficollisy or Bennettii ; it is small and distinct in 

 the Opossum, but undistinguishable from the gluteus medius 

 in Phalangista ; it is larger and separable in the Bandicoot 

 [Perameles lagotis) . 



No obturator internus exists in the Wombat or Sarcoj)hiIus', 

 but a large gemellus inferior is present in both, running from 

 the tuber ischii to the digital fossa within the trochanter. In 

 theMac7-02nis giganteus andi Bennettii the gemelli are also large, 

 and extend into the pelvis, occupying all the space above the 

 tuberosity of the ischium and below the obturator foramen, as 

 far forward as the ascending ramus of the ischium : it is thus 

 a rudimental obturator. This muscle is still smaller in the 

 Phalanger, but more distinct, though small, in the Opossum. 



The obturator externus is very large and normal in Phasco- 

 lomys and Sarcophilus^ as well as in Macropus giganteus^ the 

 Wallaby, Phalanger, and Opossum. Meckel says there is no 

 obturator internus or gemelli in the Kangaroo, but that they 

 are present in the Opossum. 



The quadratus femoris is absent in the Wombat, and present 

 only as a partially differentiated slip of the adductor magnus 

 in Sarcophilus ; it is large and distinct in the Kangaroos, and 



