MYOLOGY OF THE ORNITHORH YNCHUS . 173 



perfect article, that the circumstances under which it was prepared 

 deprived us of the advantage of consulting Meckel's memoir, or any- 

 thing else that may have been published upon the subject, except the 

 short notice in Owen's C. A. & P. V., iii, pp. 2-7. This frank state- 

 ment of our limited resources, so far from being made with any desire 

 of disarming criticism, is intended to invite correction of errors we 

 may have committed in identification of muscles ; and this, we trust, 

 a certain accuracy of descriptive detail will render comparatively easy. 

 We desire to record here our present conviction, that the identifica- 

 tion, with entire accuracy, of the singularly modified muscles that lie 

 upon the sauropsidan shoulder-girdle of this mammal, will go far 

 toward establishing, in myology, the hypothesis of Antero-posterior 

 Symmetry that is maintained by Wyman. Wilder, and the writer. 



