166 Prof. A. Macalister on the Myology of 



the outer border of tlie marsupial bone, and into the linea alba. 

 From the iliac spine to the root of the marsupial bone there 

 runs in the lower border of this muscle a tendinous band, at 

 which the femoral fascia lata splits, and which arches over 

 the femoral vessels : this evidently is the true Poupart's liga- 

 ment. A similar arrangement exists in Sarcophilus ; the 

 external abdominal ring intervenes between the Poupart's 

 ligament and the marsupial bone. 



The pyramidalis arises from the inside of the marsupial 

 bone, and is inserted into the median line for a considerable 

 extent. The rectus in Sarcojjhilus and the Wombat arises 

 from the pubis inside the marsupial bone, and is inserted into 

 the cartilage of the first rib, but was not connected to the 

 subclavius. In Sarcojjiulus it extends up to the summit of 

 the sternum ; its inscriptions are clear and distinct. 



The transversalis and internal oblique muscles are normal 

 in every respect. 



The quaclratus lumborum is a wide triangular muscle in the 

 Wombat, arising from the posterior third of the iliac crest and 

 from the ilio-lumbar ligament, and is inserted into the trans- 

 verse processes of the lumbar vertebree and, by a few fibres, 

 into the last rib. A small portion of it springs from the upper 

 transverse processes and passes also to the last rib. 



The gluteus maximus in the Wombat is united to the agi- 

 tator caudas, and arises from the posterior margin of the crest 

 of the ilium and lumbar fascia, and is inserted into the outer 

 and back part of the great trochanter. In Sarco2jhilus its 

 course is similar, but it is separate from the agitator caudse 

 and lies beneath it. In Macrojms Bennettii it is divided 

 into two — one anterior, from the front of the iliac crest, and 

 one posterior, from its usual site of origin : they are with dif- 

 ficulty separable ; but the anterior is properly the tensor 

 vaginae femoris. The same separation is present in the Giant 

 Kangaroo ; and the posterior border is with difficulty separable 

 from the agitator caudte : they are still more closely fused in 

 the Phalangista vidpina and also in Didelphys virginiana. 



The gluteus medius is with difficulty separated from the 

 gluteus minimus, and is very large in the Wombat ; it is 

 smaller in Sarcophilus, and in both displays nothing un- 

 usual in its attachments : they are quite separable in Ma- 

 cropus gigantcus and rujicollisj also in the Opossum, Phalanger, 

 and Perameles. 



The agitator caudge is separate from the external gluteus 

 in Sarcophihts, and arises from the posterior border of the 

 crest of the ilium by a very few fibres, also from the sacrum 

 and three anterior caudal vertebrae ; passing superficial to the 



