The posterior end of the interclavicle lies in contact with the right scapulocoracoid.
"A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas" by Theodore H. Eaton
The interclavicle is absent from all mammals except Echidna and Ornithorhynchus.
"Dragons of the Air" by H. G. Seeley
The relations of this bone to the clavicles seem to leave no doubt that it is the equivalent of the Lacertilian interclavicle or episternum.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard