4 THÉEL, DEVELOPMENT OF ECHINUS MILIARIS L. 



will easily perceive that the results gained by MacBride 

 agree in most instances with my own, though the researches 

 have been undertaken in two different species of echinoids. 



My nnfinisbed investigations may best be illnstrated by 

 figures selected from my series , of sections and accompanied 

 by a brief explanatory text. 



All tlie figures have been drawn with the aid of Abbe's 

 camera lucida by G. Liljevall, a skilful artist, and one of 

 the best scientific illustrators of the present day, and I avail 

 myself of this opportunity to express my sincere thanks to 

 him. 



