3o8 
OWEN’S POSITION IN 
all subsequent researches in that field. The same 
may be said of his investigations on the Mono- 
tremes and Marsupials, the substance of which is, 
for the most part, incorporated in the well-known 
articles of the ‘ Cyclopaedia of Anatomy and 
Physiology.’ These remained, for many years, 
indeed are still, in most respects, the best source 
of information about these animals. 
The researches on the minute structure and 
the development of the teeth, summed up in the 
‘Odontography’ (1840-45), and the article 
‘ Odontology,’ " so far as they deal with the out- 
ward form, the microscopic appearances, and the 
order of succession of the teeth, and furnish a 
foundation for a useful and consistent nomencla- 
ture of dental arrangements, have been of very 
great service both to the ordinary zoologist and 
to the student of fossil remains. 
In regard to the class of birds, the memoirs 
on the Apteryx, the Great Auk, and the Dodo are 
particularly noteworthy ; and the article ‘ Aves ’ 
in the ‘ Cyclopaedia of Anatomy and Physiology’ 
very long held its own, as the best summary of 
avian structure. 
The paper on ‘ Lepidosiren ’ left no doubt of 
the piscine affinities of that animal. 
Among the Invertebrates we have the article 
‘Cephalopoda’ (1836), the ‘ Memoir on Limulus ’ 
(1873), the ‘Researches on the Bravchiopoda ’ 
^ Encyclopedia Brilannica, 1.858. 
