HO MORPHOLOGICAL DEVELOPMENT. 



foregoing chapter was issued, I supposed myself to be alone 

 in holding this belief respecting the annulose type,, and long 

 continued to suppose so. Over thirty years later, however, in 

 M. Edmond Perrier s work, La Philosophic Zoologique avant 

 Darwin, I found mention of a lecture delivered by M. Lacaze- 

 Duthiers at the Ecole Normale Superieure in Paris, and re 

 ported in the Revue des Cours Scientifiques for January 28, 

 1865, in which he enunciated a like belief. Judging, how 

 ever, by the account of this lecture which M. Perrier gives 

 (he was present), it appears that M. Lacaze-Duthiers simply 

 contended that this view of the annulose structure as arising 

 by union of once-independent units, is suggested by certain 

 a priori considerations. There is no indication that he 

 assigned any of the classes of facts above given, which go to 

 show that it has thus arisen. 



For further facts and arguments concerning the genesis 

 of the annulose type, see Appendix D 2.] 



