26 OBSERVATIONS ON THE ANATOMY OF 
III. — Observations on the Anatomy of the Duck- 
hilled Animal of New South Wales, the Onii- 
thorynchus paradoxus of Naturalists, 
By Robert Knox, M. D. 
Member of the Wernerian Natural History Society, and 
of the Medico-Chirurgical Society of Edinburgh. 
(Read im Ma^ 182S.) 
Memoir I. 
On the Organs of Sense, and on the Anatomy of tlie 
Poison-Gland and Spur. 
It will not be expected that, after the numerous dissec- 
tions of the Ornithorynchus, performed in England, Ger-- 
many, and France, by the most distinguished living ana- 
tomists, any very remarkable facts should have escaped 
notice. I am anxious that this should be borne in mind, 
for there are many who, viewing the Ornithorynchus as an 
excessively rare animal, might suppose every fact brought 
forward to be new, and censure the want of details, which 
could be useful only in the description of an animal hitherto 
altogether unknown. Now, this is far from being the case 
with the subject of the present memoir ; for, at least one 
specimen has been anatomized in Germany, by Professor 
Blumenbach ; one in Prussia, by M. RujDOLrm ; several 
