Newman.—Notes on the Physiology and Anatomy of the Tuatara. 237 
M. iliacus (a muscle so called by Günther) arises from the whole of the 
ascending outer surface of the ilium, directly covers in the hip-joint, and is 
inserted by a broad fleshy band into the posterior and hinder aspect of the 
femur. Its origin is hidden by the long head of the extensor cruris, and is 
separated by the very strong fascia. This muscle resembles in position, 
origin, and insertion the gluteus in man. 
Quadratus femoris arises from the border and side of the tuber ischii, 
and is inserted into the digital fossa. It is a small muscle, about one 
quarter the size of the obturator externus. Gemelli and pyriformis are 
represented by a small mass of muscle coming from the ventral surface and 
posterior edge of the vertical ilium, and inserted into the head of the femur 
just below the capsular ligament. 
Acetabulum. 
Length of cavity half as long again as the breadth; lower border 
straight, upper curved. Capsular ligament very strong, lined by synovial 
membrane. It embraces the edges of the acetabulum, and is especially 
thickened on the upper part by a ligament corresponding to the ligamentum 
teresin man. This ligament is inseparable from the capsule; the latter is 
also specially thick anteriorly. The acetabulum faces directly outwards 
and slightly backwards. Acetabulum shallow, very slight lip, dislocation 
would easily occur but for the cartilage round the edge, the capsular 
ligament, and the muscles which lie in contact with and materially strengthen 
it. The obturator foramen is long and oval, filled by a membrane, which - 
is pierced by the obturator nerves and yesséls. 
Fas 
Fascia lata of the thigh is acs to the pelvic rim and superior 
external border of the ischium ; here it is strong and thick and covers the 
whole of the outer side of the thigh and ends in a broad aponeurosis which 
closely envelopes the knee joint. It receives the insertion of the tensor 
vagins femoris. The fascia is very intimately connected with the long head 
of the extensor cruris, much resembling relationship between the human 
gluteus maximus and fascia lata. A very strong fascia closely binds the 
caudal muscles. 
The great ischiatic nerve passes out behind the ilium, gives off numerous 
branches and runs down the popliteal space, in the lower part of which it 
divides into several branches just prior to entering the sural muscles. It ig 
covered in by the musculus agitator caude, to which it supplies a branch. 
Muscles of fore limbs. 
The deltoid arises from the posterior portion and border of the cartila- 
ginous scapula and passes directly downwards to be inserted into the middle 
of outer side of humerus, its tendinous portion passing between the triceps 
