190S 



ON THE DEVELOPMENT OF NEBALIA. 383 



On the Development of Nebalia. 



By 



Iflargaret Robinson, 



Zoological Research Laboratory, University College, London. 



With Plates 16—21. 



i 



Introduction. 



It was at the suggestion of Professor W. F. R. Weldon 

 that I began this investigation, and he kindly gave me the 

 material which he had taken from the brood pouches of speci- 

 mens obtained by dredging at Naples. Unfortunately it had 

 been preserved some time when it came to me, and part of it 

 (including some of the later stages) had been rendered of 

 little use by the action of tannin from the corks of the bottles. 

 I have, however, been able to work at six stages which are 

 fairly consecutive, and seem important. 



I may mention that I have tried to supplement my material 

 by means of visits to places where Nebalia is abundant, 

 namely, Jersey and Eoscoff. At the latter place I received 

 much kindness and assistance from Prof esseur Yves Delage and 

 Monsieur A.Robert. Numbers of adultNebalia were obtained 

 from decaying crabs and lobsters, which had previously been 

 placed under stones on the shore at low tide. None of these 

 had eggs in the brood pouch, and though I spent a good deal 

 of time and tx'ouble in trying to make the animals breed in 



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