248 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
the staff of the British Museum working upon invertebrates met together to 
examine Thompson’s paper, and unanimously came to the conclusion that 
Polyzoa was not given as a class designation. 
Bryozoa was for a long time used in England, and then Busk introduced 
Polyzoa as being Thompson’s name. I was not surprised that Busk, Allman, 
and Hincks, who had worked together, did not change, but I felt confident that 
the change would soon be made by a younger generation. In this I seem to 
have been mistaken, and so long as any of our leaders use Polyzoa we must 
recognise that there are two sides to the question, though I find it very 
difficult to understand how this can be if we try to divest ourselves of the 
knowledge gained since Thompson’s time and put ourselves in his positien. 
BowERBANKIA IMBRICATA (Adams). (Plate 25. figs. 6-10.) 
Sertularia imbricata, Adams, Trans. Linn. Soc. vol. vy. (1800) pl. 2. figs. 5-11. 
Miss Jelly’s list of synonyms may be consulted and add :— 
Bowerbankia imbricata, Hincks, Ann. Mag. Nat. Hist. ser. 5, vol. xix. (1887) p. 809; 
Levinsen, Zool. Dan. vol. iv. (1894) p. 82, pl. 8. figs. 5-9; Robertson, ‘‘Bryozoa,” Proc. 
Washington Acad. of Sciences, vol. ii. (1900) p. 331; Calvet, “Bry. Mar. de Cette,” Tray. 
Inst. de Zool. de 1’ Univ. de Montpellier, 2nd ser. Mem. 11, p. 90 (1902); Nordgaard, “ Hydr. 
& Biol. Investigations,’ Bergens Mus. p. 174, pl. 3. fig. 86 (1905); “Bry. from the 2nd 
Fram Expedition,” p. 39 (1906); Loppens, K., “ Bry. marins & fluy. de la Belge,” Ann 
Soc. R. Zool. & Malac. de Belge, vol. xli. (1907) p. 308, fig. 22. 
At first the specimen from the Sudan was taken to be B. caudata, Hincks, 
on account of the process at the base of the zocecium, but this is not a character 
confined to one species, and I find processes on both B. imbricata, Adams, 
and B. pustulosa, H. & 8., from Poole. These are usually bifurcate or forked 
and their function has not been generally understood, but they are small 
rooting processes attaching themselves to seaweed Kc., as is seen in some Red 
Sea specimens. Radicles, as a rule, are separate chambers, only connected to 
the zocecial chambers through a diaphragm or rosette plate, whereas here 
they are only a swelling of the zocecial wall. Such a growth is not entirely 
unknown in the Cheilostomata, and I have referred to it in Schizoporella 
argentea, Hincks*. These processes are in parts formed on all the zocecia, 
although only a few may find an attachment ; just as in many Cheilostomata 
there is a radicle chamber where no radicle is formed. Jullien { partially 
recognised the meaning of these processes when describing his Bowerbankia 
minutissima, and says: ‘“‘ autour de cette base existent des sortes de processus 
ou de crampons fixant la zocecie au support colonial.”’ It is at present impos- 
sible te recognise any of Jullien’s species, and no figures are given. 
Levinsen { mentions and figures these processes in both B. imbricata and 
* Journ. Linn. Soce., Zool. vol, xxxi. (1908) p. 146. 
+ Mission du Cap Horn, p. 21. 
} Zool. Danica, ‘‘ Mosdyr,” p. 82, pl. viii. figs. 3, 6. 
