516 ALFRED 0. HADDON. 



On Budding in Polyzoa. 



By 



Alfred C. Haddon, m.A., 



Professor of Zoology in the Royal College of Science, Dublin. 



With Plates XXXVII and XXXVIII. 



Introductory. 



Mr. Hincks, in his valuable monograph on the British Marine 

 Polyzoa (1), after discussing the nature of the "brown body" 

 found in the old zooecia of Polyzoa, and its relation to the de- 

 veloping bud closes with these words (p. Ixiii) : " There seems, 

 therefore, to be grounds (pro tan to) for desiring some further 

 investigation of the subject.'^ This, then, must be my excuse 

 for offering these somewhat imperfect observations. 



The investigations on Flustra carbasea were made in the 

 month of May, 1879, whilst I was occupying the table belong- 

 ing to the University of Cambridge, in Dr. Dohrn's Zoological 

 Station at Naples. The other observations were made on 

 species obtained from Dublin Bay during 1881-2. 



Of the nature of the brown body itself 1 do not propose to 

 treat, as the evidence of other observers as well as of my own 

 studies is perfectly satisfactory in favour of its being, as Hincks 

 says, " derived from the polypide, and is the result of its de- 

 cline;" but I will limit myself solely to the origin and develop- 

 ment of the bud. 



Own Observations. 



Flustra carbasea, E. and S. (The following observations, 

 ■when not otherwise stated, apply to the living state only) In 



