522 ALFRED C. HADDON. 



older polypide was rapidly histolysing into the brown-body; 

 thus in this case the bud was formed before the complete de- 

 gradation of the parent, and at a slight distance from it. 



A prepared specimen (PI. XXXVIII, fig. 14) indicates the 

 origin of part at least of the bud from the endocyst of the 

 opercular opening ; the original occupant of this zooecium had 

 scarcely commenced to decay. 



Flustra sccurifrons, Pall. — Another prepared specimen 

 from Naples (PL XXXVIII, fig. 15) shows a possible double 

 origin for the lophophore and stomach in a young marginal zooe- 

 cium. It will be seen that anterior band of endocyst has just 

 been formed, and slung upon this is an undoubtedly epiblastic 

 invagination or proliferation, coaled by mesoblast. On one side 

 is a mass of cells, which is continuous with what appears to be 

 the incipient funiculus. This mass of cells, I take it, will form 

 the future stomach and intestine; it soon ceases to exist as a 

 distinct group of cells. I have several times noticed this stage. 



Flustra papyracea, E. & S, — In new zooecia the buds 

 may be seen to arise in close contact with the endocyst of the 

 floor or of the wall of the cell, according to whether they may 

 be terminal or lateral additions. Very shortly they assume a 

 more central position, and are more or less thickly enveloped 

 in a funicular plexus, from which latter there is every appear- 

 ance of additions being made to their substance. The develop- 

 ment of the polypide is exactly as described above. 



In old zooecia the buds are developed in the anterior portion 

 of the cell. 



PI. XXXVI IT, fig. 16, shows a bud which is partly formed 

 of columnar cells and partly of rounded. The latter appear to 

 be produced at the expense of the funicular tissue; the former 

 probably arose from the epiblastic layer of the endocyst. 



Bugula flabellata, J. V. Thompson.— PI. XXXVIII, 

 fig. 17, shows a new zooecium, within which is the young bud, 

 which has a well-marked bilobed appearance. Closely applied 

 to the fundus of the stomach-sac is an ovary, which has been sup- 

 plied ready-made to the bud. It is invested by the funicular 

 tissue, which organically connects all the members of a Polyzoan 



