"Pectoral girdle of Echidna. sc., Scapula; cl., clavicle; i.cl., prosternum or "interclavicle"; co., coracoid or metacoracoid; e.co., procoracoid or precoracoid; st., mesosternum." -Thomson, 1916

Echidna Pectoral Girdle

"Pectoral girdle of Echidna. sc., Scapula; cl., clavicle; i.cl., prosternum or "interclavicle"; co.,…