UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol 3, No. 12, pp. 253-298. 33 Text Figs. May 15, 1907 



BIOLOGICAL STUDIES ON CORYMORPHA.— II. 



THE DEVELOPMENT OF C. PALMA 



FROM THE EGG.^ 



BY 



HAEEY BEAL TORREY. 



Introduction. 



\ 



The present investigation was undertaken with the purpose of 

 analyzing the processes which characterize the development of 

 the embryo of CorymorpJia, in order (1) to discover to what 

 extent the form of the species might be determined by its activi- 

 ties, and (2) to compare the normal embryonic processes with 

 those which appear in the regenerative development. 



No definite attempt to determine the relations which might 

 exist between the behavior, the normal and the regenerative 

 development of any animal has been made heretofore, so far as 

 I am aware. Morgan (:01a) called attention, in an essay in 

 the American Naturalist, to the desirability of a systematic com- 

 parison of the processes of> regeneration in egg, embryo and 

 adult. He also emphasized the fact that little account had pre- 

 viously been taken of the problems involved in this sort of work. 

 Shortly afterward, Schultz ( :02) considered briefly, in the Bio- 

 logisches Centralblatt, the relation between a number of phe- 

 nomena of regeneration, normal development from the egg, and 

 non-sexual reproduction. Subsequent theoretical discussions by 

 Holmes (:04), and still more recently by Child (:06), have 

 aimed at bringing all the phenomena of regulation under a com- 

 mon point of view. 



In 1902 I began investigation in this field, with the conviction 



that normal activities also should form one element in the general 



' Biological Studies on Corymorpha. — I. C. palma and Environment. 

 Journ. Exp. Zool., I. No. 3, pp. 395-422. 



