308 OWEN'S POSITION IN 



all subsequent researches in that held. 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,' 9 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 Brachiopoda ' 



9 Encyclopaedia Britamiica, 1858. 



