BRYOZOA FROM ZANZIBAR. 853 
Hippuraria verticillata Hincks (non Heller), Ann. Mag. Nat. 
Hist. ser. 5, vol. xix. p. 311, pl. ix. fig. 8 (1887). 
I have only found a small piece from the Red Sea, but it 1s 
evidently widely distributed, as I have it from Naples, the Red 
Sea, and Zanzibar. 
The rhizome of the Zanzibar specimens is 0°01 mm. in diameter ; 
the zocecia are 0-4 mm. long and 9-1 mm. wide, about the size 
given by Busk. At intervals on the stalk there is a pair of 
zocecia growing from an expanded part, and there is often from 
the same expansions a pair of radicles growing at right angles to 
the stalk; also frequently there are lateral branches near to the 
expansions, and these sometimes have pairs of zocecia near to the 
main branch. | 
A zoecium from which a polypide has disappeared usually 
assumes a Swollen * barrel-shape (PI. LV. fig. 9, 6), as the muscles 
which kept them in shape have now disappeared, and the same 
kind of thing occurs in many Ctenostomata. 
IT am unable to follow Hincks when he identifies his Hippu- 
raria verticillata + with Heller's species; also I have shown that 
the genus Hippuraria was founded upon a mistake, and is only a 
synonym of 7'ridécella. Although Hincks speaks of a group of 
cells at the joint, the figure shows a pair, and perhaps other nearly 
adjacent pairs have given the appearance of a group, so that, 
although I have scarcely any doubt as to Hincks’s verticillata 
being a synonym of Busk’s atlantica, there is just the possibility 
of this not being the case. 
The peduncle is attached to the zowcium excentrically, and 
there is a muscle from the side of the wall to the projecting base 
of the zocecium by which it is moved as a whole. 
There is a somewhat similar muscle in Mimosella gracilis 
Hincks. Joliet mentions this also in his Valkeria nutans =, and 
Hincks was apparently unaware of Joliet’s later description when 
describing H. verticillata. Heller’s figure of Valkeria verticillata, 
and Hincks’s figure of Valkeria wva in the ‘ British Marine 
Polyzoa’ are very similar. 
Loc. Bahia, 10-20 fath. (Chall.); Naples (4. W. W. coll.) ; 
Adriatic ; Suez; Ceylon (Z7%.); Indian Ocean (7h.); Amirante, 
25 fath. (7h.); Providence, 50-78 fath.(Zh.). Ras Osowamembe, 
Zanzibar Channel, 10 fath. (504); Wasin, Brit. E. Africa, 10 fath. 
(500), collected by Crossland. 
VALKERIA UvA (Linneus). 
For synonyms see Waters, ‘‘ Mar. Biol. of the Sudanese Red 
Sea, Cyclostomata, Ctenostomata, and Endoprocta,” Journ. Linn. 
Soc., Zool. vol. xxxi. p. 250, pl. xxiv. fig. 13, pl. xxv. figs. 4, 
12, 13 (1910); Osburn, “Biol. Survey of Woods Hole and 
* Journ. Linn. Soc., Zool. vol. xxxi. p. 239, pl. xxv. fig. 6. 
+ Ann. Mag. Nat. Hist. ser. 5, vol. xix. p. 311, pl. ix. fig. 8 (1887). 
£ “Etudes Anat. & Emb. sur le Pyrosoma giganteum,” p. 106, pl. v. fig. 4 (1888). 
