aboral, oral, lateral views and ambulacrum details from Cotteau, G. H. & Triger, J. 1857-1869. Échinides du département de la Sarthe, considérés au point de vue zoologique et stratigraphique. J.-B. Baillière et Fils, Paris, xv+457 pp.
The Degu is a small caviomorph rodent that is endemic to central Chile. It is sometimes referred to as the Brush-tailed rat, and is also called the Common Degu.www.degus.com/deguz.html
A monograph of the Trochilid, or family of humming-birds /.London :Printed by Taylor and Francis ;1861 [i.e. 1849-1861].biodiversitylibrary.org/page/35246333