a new Fossil Animah 
58 T 
Ichthyosaurus, the furcula or sternal arch, which we yet think it 
most probable, from the form of the scapula, must have existed in 
this animal also. 
Anterior extremity * It is proper that we should begin by stating, 
that all the bones composing this part of the skeleton were, in 
Col. Birch’s specimen, loose and detached. The determination of 
their exact situation may therefore be considered as in a certain 
degree conjectural ; but we trust that the reasons we shall alledge 
will prove satisfactory, and leave little if any doubt on the subject. 
The scapula and humerus represented by c and b , in the figures 
of plate 42, have their relations positively determined by a specimen 
in the Bristol library collection, in which they occur together. 
This also shews the form of the latter bone more completely, which 
in Col. Birch’s collection is much compressed. The scapula, r, is 
still smaller than in the Crocodile, but generally resembles it in 
form ; its back is slightly excavated, which gives it a figure proper 
for attachment, as in the Ichthyosaurus, to the sternal arch ; its 
upper extremity also forms a concave triangular articulating face, 
which probably received a process from the sternal arch. 
The humerus, b , requires no description ; it could only be con- 
founded with the femur, and its association with the scapula re- 
moves this suspicion. 
The fiat clavicles, #, are so exactly similar to those of the 
Ichthyosaurus, that no one familiar with the latter bones could hesi- 
tate in assigning their place. Their articulating surfaces moreover 
(although much compressed in Col. Birch’s specimen), clearly 
coincide with those of the scapula, in forming the glenoidal cavity ; 
* If we follow the views suggested by the late observations on the muscles attached 
to the analogous bones in birds and reptiles, we must here, as in the Ichthyosaurus, 
consider what has been termed in the text the clavicle as rather answering to the 
coracoid process. 
