700 MH. F. G. PAESONS ON THE [June 16, 



• The Flexor caucke intermis is inserted by long tendons into the 

 ventral surface of the roots of the transverse processes, the most 

 internal tendons being first inserted, while the deeper ones reach 

 the surface round the outer side of them. 



The Bhxor caudce profundus is fleshy, and runs along the 

 ventral surface of the tail close to the middle line, being concealed 

 by the last muscle and separated by a nerve from the flexor 

 caudo) externus. 



Muscles of the Posterior Extremity. 



The Gluteus maximus or Ectoc/luteus is a small thin sheet of 

 muscle rising from the sacral spines and fusing anteriorly with 

 the sacro-lumbalis. It is inserted just below the great trochanter. 



The Gluteus medius is much larger than the last, and rises from 

 the greater part of the gluteal surface of the ilium by two per- 

 fectly distinct layers, of which the superficial is inserted by flesh 

 and the deep by tendon into (he outer side of the great trochanter. 



The Gluteus minimus is small, and is covered by the medius ; 

 it is inserted by tendon into the front of the great trochanter. 



The Gluteus quartus or Scansorius is very distinct and comes 

 from the ventral border of the ilium ; it is inserted into the 

 anterior surface of the femur just below the great trochanter. 



The Tensor fascioi femoris and Sartonus are inseparable, the 

 latter part being feebly marked; they rise from the anterior 

 ventral spine of the ilium and are inserted into the fascia of the 

 thigh nearly as far as the patella. This sheet of muscle is 

 supplied entirely by the anterior crural nerve. 



The Pyriformis is well marked and normal. 



The Obturator interims is normal ; on its deep surface the tendon 

 is divided into three bands. 



The Oemelli are represented by one continuous muscle, which 

 rises from the ventral margin of the lesser sciatic notch ; it is best 

 seen when the obturator internus is cut and reflected. Meckel ' 

 states that these muscles are absent in the Kangaroo. 



The Quadratus femoris is a large triangular muscle, which is 

 inserted by tendon into the second quarter of the femur. 



The Obturator externus is large and normal. 



The Biceps consists of two parts, 1 hough I am doubtful whether 

 the part described first should not rather be included with the 

 gluteus maximus. The anterior portion rises from the posterior 

 sacral and anterior caudal spines and transverse processes ; it is 

 inserted by a narrow tendon into the outer side of the patella. 

 The posterior part is large and rises from the ischial tuberosity as 

 well as by a small origin from the caudal vertebra ; it is inserted 

 into the fascia of the upper half of the leg. 



The Semitendinosus rises from the tuber ischii with the biceps, 

 and is inserted into the cnemial crest of the tibia. 



The Semimembranosus is a small muscle ; it rises from the tuber 



' ' Anat.oniie oompar6e,' vol. vi. p. 3G4. 



