EARLY STAGES. 



The mature eggo -re opaque and vsry in color 

 from an olive green to an orange yellow. Those or 

 the same-Mndividual hoisrever are constant in their 

 coloration. Until quite well developed the larvae 

 retain the color which wao on the eggs at the tine 

 they were laid. 



For echinoderms the eggs are very large ,being 

 .3 mm. in diameter. 



Soon after they are fertilized the eggs throw 

 off two membranes the first of which is much thicker 

 than th? second . 



When first laid and. their early development the 



A 



eggs float, but when their cilia are formed the larvae 

 arc able to swim below the surface. 



Not knowing that any special interest would be 

 found in the life history of the species the earliest 

 stages were not carefully observed while living nor 

 was material preserved for future study;and,as I . 

 hove stated elsewhere, all laterattempts te jet other 

 material were unsuccessful. 



This makes it necessary to begin this paper 

 with the description of a late gastrula in which 

 the first pair of enterocoeles have already begun 

 to form 8 lateral pouches from the anterior free 



