NARRATIVE OF THE CRUISE. 



381 



classes of Echinodermata by the intervention of a free-swimming bilaterally symmetrical 



' pseudembryo ' developed directly from the 'morula,' from which the true young i> 

 subsequently produced by a process of internal budding or rearrangement, has long been 

 well known through the labours of a host of observers, headed and represented by the 

 late illustrious Professor Johannes Midler of Berlin. 



" At the same time it has all along been fully recognised that reproduction through 



FlQ. lSS.— Cladodaclyla crocea (Lesson). Stanley Harbour, Falkland Islands. Natural size. 



the medium of a ' pseudembryo' is not the only method observed in the class, but that 

 in several of the Echinoderm orders, while in a certain species a wonderfully perfect and 

 independent bilateral locomotive zooid may be produced, in very nearly allied species the 

 young Echinoderm may be developed immediately from the segmented yelk without the 

 formation of a ' pseudembryo,' or at all events with no further indication of its presence 



