170 Prof. A. Macalister on the Mijologn of 



with 110 tendinous inscription ; it is similar in tlie Phalanger, 

 Opossuni, A,'/-a»Jt'/e^, Giant Kangaroo, and M. riijiculh's, in none 

 of which is an inscription present. This appearance was care- 

 fully searched for in all cases, but I ci»uhl sec no trace of it. 

 (In an Otter dissected by me, Jan. 1870, not only was an in- 

 scription well marked, but the muscle above it Iiad two sepa- 

 rate origins — one from the caudal vertebra: and the other from 

 the ischium ; and these united exactly at the intersection and 

 formed one belly.) 



The bice])s in Sarcoj>hihis arises from the tuber ischii and 

 from the upper four caudal vertebra} beneath the agitator 

 cauda^, and is inserted into the outside of the knee ; in its 

 caudal origin and libular insertion it is similar to that of the 

 agitator Cauda: in Ornithorhynchus] but in this latter ani- 

 mal a distinct biceps underlies, which has a purely iscliiatic 

 origin. The insertion is fibular* in Sarcophilus ] and the 

 muscle is very similar in its position and attachments in 

 Phascolomys. In the Wallaby its origin is connected to that 

 of the semiteiidinosus ; its tendon extends down the leg into 

 the fascia over the gasti-ocuemius. 



A foui'th hamstring (bicipiti accessorius of Ilaughton) un- 

 derlies the biceps in SarcojyMlus^ which sti'ctches from the 

 caudal vertebrre to the fibula and fascia of the leg. This 

 muscle is absent in the Wombat, in the Giant Kangaroo, Ben- 

 nett's Kangaroo, Phalanger, and Opossum ; it is the longest 

 muscle in the body of Sarcoplu'lus, as is usually the case in 

 animals in which it exists. Professor Owen describes it as 

 present in the Kangaroo, and mentions that it is inserted with 

 the biceps by two fasciculi into the outer condyle of the femur 

 and the fascia over the gastrocnemius. 



The gracilis arises in the Wombat and Sarcophilus from the 

 symphysis and descending ramus of the pubis, and is inserted 

 into the inside of the knee-joint ; it is a strong muscle ; it has 

 an attachment to the marsupial bone in these as in all the 

 other marsupials which I have examined. 



The sartorius in i\ieW omh<\t, Phalang is fa, Mcicropus f/ifjan- 

 teus, Wallaby, and Dasyurus mcicrurus arises from the anterior 

 superior spine of the ilium, and is inserted into the inner side 

 of the ])atella. In Sarcophilus its origin is extended inward 

 along Poupart's ligament, as in Brnrlypxis tridactylus. In 

 Perameles it is nearly parallel to the rectus femoris. 



The tibialis anticus in the Wombat passes from the outer 

 surface of the tibia to the cntocuneiform bone ; it is well 

 marked and presents nothing unusual in its appearance in the 

 Virginian Opossum or in the Phalanger. In the Giant Kan- 



