524 Proceedings of the Royal Irish Academy. 
Extensor brevis digitonim ('10) carises from the back of the carpal 
and metacarpal bones, joins extensor digitorum communis, and is 
inserted along with it. 
Abductor primi digiti (absent in Arctopithecus) extends from 
the scaphoid and annular ligament to the first phalanx of the inner 
digit (Professor Macalister). 
Abductor annularis ( *0 1 ) is bicipital, one head from the base of the 
germ of the outer metacarpal, the other from the pisiform. 
Adductor annularis extends from the outer side of the carpus 
obliquely inwards to the distal end of the fourth metacarpal. 
Adductor poUicis arises from the ulnar side of the base of the com- 
bined metacarpal, and is inserted into the base of the rudimentary- 
thumb. The first and second palmar interossei, normal in our 
specimen, and in Professor Humphry's, were absent in Professor 
Macalister' s. 
The abdominal mascles are : — 
Eectus abdominis takes origin from middle line of the pubis, dis- 
plays two very oblique inscriptions going downwards, and is inserted 
into the cartilages of the third, fourth, fifth, sixth, and seventh ribs. 
Obliquus abdominis externus arises from the sixth to the fourteenth 
rib, and is inserted as usual. 
Obliquus abdominis internus has its origin from the iliac crest, 
Poupart's ligament, lumbar fascia, and last rib, its fibres thin above 
and thick below, run upwards and inwards to the usual insertion. 
Transversus abdominis arises from the anterior borders of the 
costal cartilages and lumbar fascia, is thick above and thin below, and 
has the normal insertion. 
In the hind limb : — 
Gluteus maximus ('12) arises from the tuber ischii and sacrum, 
and is inserted into the upper half of the femur on its outer side. 
Professor Macalister found its origin from the posterior border of the 
ilium, and from the side of the sacrum (to which Professor Humphry 
adds the spines of the caudal vertebrse), and its insertion into the 
outer part of the femur just beneath the great trochanter, and into the 
fascia (Professor Humphry). 
Gluteus medius (-20) normal, with a little care separable from 
gluteus minimus ('05) which was also normal. They were found 
fused by Professors Macalister, Humphrey, and Meckel. 
Tensor vaginge femoris ('05) arises from the anterior superior spine 
of the ilium (anterior fifth of iliac crest. Professor Macalister), and is 
inserted into the outer side of the femur below the great trochanter. 
Pyriformis ("02) separable without much trouble from gluteus 
medius, arises from the marginal and anterior surface of the sacrum, 
and from the posterior inferior spine of the ilium ; (the two latter 
origins were not found by Professor Macalister) ; the insertion is nor- 
mal. Professor Humphry found it fused with gluteus medius to 
form a large muscle arising from the outer surface of the ilium, from 
the margin of the sacrum, and from the transverse processes of the 
