OF THE OIlNITHOllYNCHUS PARADOXUS. 169 
I intend saying but little on the muscular system, be- 
cause the muscles being simply the moving powers of the 
bones, an inspection of the skeleton will readily explain any 
peculiarities which may exist in the former. 
The muscles situated on the neck, connecting the head, 
trunk, and cervical vertebrae, are very powerful, and seemed 
to me regular. Those of the back and tail are distributed 
much as in the Beaver. The marsupial bones have two 
muscles connected with them, which proceed from their 
whole inner edge upwards towards the sternum : these may 
be considered as analogous to the pyramidales in man. 
The recti, and other abdominal muscles, are present, and 
regular. The pectoral muscles, which are divided into two, 
arise from the whole upper edge and mesial line of the 
complex clavicles, and from the Imea alba of the abdomen, 
nearly as low as the pubis : these muscles are inserted se- 
parately into the humerus ; the superior or anterior one is 
perforated by a strong muscle (the deltoid), arising from 
the dorsum and acromial process of the scapula, to be in- 
serted into the os humeri. 
When the external pectoral muscles are removed, two 
broad muscles are found immediately beneath, arising from 
the whole surface of the peculiar squamous bone (described 
at considerable length above, under the name of the Squa- 
mous Process of the Scapula ;) and inserted the one into the 
inner tuberosity of the os humeri ; the other into the same 
bone, but much nearer the fore-arm. These may be con- 
sidered as analogous to the coraco-bracliialis of the Mam- 
malia ; or we may prefer giving the name of Coraco-brachia- 
lis to two long muscles of a rounded form, which arise from 
the coracoid process itself, and are inserted into the os liu- 
meri. From the same squamous bone, and from the semi- 
circular edge of the peculiar clavicle, arises a long slip of 
muscle, which, proceeding dov/nv/ards, is inserted into the 
