ON THE LIFE-HISTORY OF PEDICBLLTNA. 261 



in the methods by which the alimentary canal is lost in the 

 two cases) as the primary individual of a Pedicellina colony 

 would be immediately after the loss of its calyx, supposing that 

 it had not meanwhile developed a stolon and secondary 

 calyces. 



Unless I am mistaken in my views with regard to the meta- 

 morphosis of Pedicellina, it appears to me necessary to con- 

 clude that in the Entoprocta the ventral line of the body 

 extends from a. v? in figs. 10 and 19, down the right sides of 

 the figures, as far as a. v} The median dorsal line will in con- 

 sequence be represented by the entire left sides from a. v} to 

 a.v.^ These surfaces are most clearly expressed in the young 

 Loxosoma bud, in which the whole of the surface turned 

 away from the parent (characterised by the possession of ves- 

 tibule and foot-gland) is ventral, whilst the opposite surface of 

 the bud is, conversely, dorsal. 



I hope to be able before long to publish some account of the 

 development and metamorphosis of the Ectoprocta. Till that 

 time I prefer to withhold any further expression of opinion 

 with regard to the surfaces and relations of the larvae of this 

 group of the Polyzoa. 



List of Papers Referred to. 



1. B. Hatschek. — "Embryonalentwicklung und Knospungder Pedicellina 



echinata," ' Zeits. f. wiss. Zool.,' Bd. xxix, 1877, S. 502. 



2. B. Hatschek. — " Studien zur Entwicklungsgeschichte der Anneiiden," 



' Arb. a. d. Zool. Inst, zu Wien,' Bd. i, 1878, S. 277. 



3. J. Babrois. — "Metamorphose de la Pedicellina." 'Comptes rendus de 



I'Acad. des Sci.,' T. xcii, 1881, p. 1527. 



4. S. F. Habmer. — " On the Structure and Development of Loxosoma," 



' Quart. Journ. Mic. Sci.,' vol. xxv, 1885, p. 201. 



