ADDITIONAL NOTES UPON THE DEVELOPMENT OF THE 



LOBSTER. 



BY DR. PHILIP B. HADLEY. 



PREFACE. 



The present work is the culmination of a study of the development 

 of the American lobster (Homarus americanus). Its aim is to present, 

 in a series of drawings the most important points in the development 

 of the appendages and body-form of the lobster as it passes on from 

 the larval stages into maturity. Drawings of all the appendages in 

 all the stages are not presented, only those being figured which show 

 the more important changes in shape or size. In all cases, the aspect 

 which shows best the most important parts of the appendages has 

 been represented. All drawings of the appendages were made with 

 camera lucida, and the magnification is stated in each figure. The 

 work was done while the writer was investigating problems of the 

 lobster at the Wickford Experiment Station of the Rhode Island 

 Commission of Inland Fisheries, and at the biological laboratory of 

 Brown University. Thanks are especially due to Prof. A. D. Mead, 

 of Brown University, for the opportunity of carrying on this work, 

 and for much material assistance. 



