694 MR, F. G, PARSONS ON THE [June 16, 
There is no Scalenus anticus ventral to the subclavian artery 
and brachial plexus. 
The Scalenus brevis rises from the posterior two or three cervical 
transverse processes and is inserted into the first rib behind the 
vessels. 
The Scalenus longus rises with the last and is inserted into the 
outer surfaces of the 2nd, 3rd, and 4th ribs. 
The Rectus capitis anticus major rises from the 3rd to the 7th 
cervical transverse processes as well as, by an internal origin, 
from the bodies of the anterior four thoracic vertebre. Its 
insertion is normal. On the outer side of the last muscle, sepa- 
rated by it from the longus colli, is a muscle which rises from the 
ventral part of the posterior four cervical transverse processes to 
be inserted into the body of the axis and the ventral arch of the 
atlas. 
The Longus colli is normal, and extends as far back as the 4th 
thoracic vertebra. 
The Rectus capitis anticus minor and lateralis are normal ; the 
former comes from the transverse process of the atlas, lying 
external to the major, and ventral to the rectus lateralis. 
The Splenius capitis is normal and entirely covers the com- 
plexus. 
The Splentus colli is continuous with the last, and is inserted 
into the transverse processes of the anterior three cervical 
vertebra. 
The Trachelo-mastoid is very well developed ; it is inserted into 
the outer part of the curved line of the occipital bone, into the para- 
mastoid process, and into the transverse processes of the anterior 
cervical vertebre. Its insertion is tendinous, and there are two 
other tendinous intersections turther back. 
The Transversalis colli is large and is inserted into the posterior 
five cervical transverse processes. 
The Cervicalis ascendens is mserted into the last three cervical 
transverse processes. 
The Rectus capitis posticus major is distinctly bilaminar, a con- 
dition I have also found in the Guinea-pig ’. 
Muscles of the Anterior Extremity. 
The 7'rapezius rises, as in the Great Kangaroo and Bennett’s 
Wallaby, from the ligamentum nuche and anterior six thoracic 
spines ; it has a continuous fleshy origin except opposite the first 
thoracic spine, where it is aponeurotic. It is inserted into the 
clayicle as far as the origin of the cleido-mastoid, into the acro- 
mion, the spine of the scapula, and the fascia over the infra- 
spinatus. 
The Latissimus dorsi rises from the 5th, 6th, 7th, and 8th 
1 Proceedings of the Anatomical Society, February 1892, p. x. 
