ON BRYOZOA FROM ZANZIBAR. 831 
46. The Marine Fauna of British East Africa and Zanzibar, 
. from Collections made by Cyril Crossland, M.A., 
B.Se., F.Z.S., in the Years 1901-1902. Bryozoa— 
Cyclostomata, Ctenostomata, and Endoprocta. By 
ARTHUR Wm. Waters, F.L.S., F.G.S.* 
[Received May 19, 1914: Read June 9, 1914. | 
(Plates L-IV.7 & Text-figure 1.) 
INDEX. 
Page 
Geographical sDistnibuttommys ery ceeeneeessaet cesar snes ce Soe 
Systematic: 
Gristaenflacaaspelenreeenecee ee are Oe at Ee OOD 
(OFROSOG): COREUMGAITy SDo Ts eosocasdadsbooosoucdsune cbobae esr Gon gbbor oodoaun ats AO) 
Entalophora wasinensis, WOM. NOV. 22... ... eee eee eee eee esses. 840 
Mimosella bigeminata, sp. 0. ...... 6.0 eee eee cece = 851 
Zoobotryon pellucidum, rosette-plates ............ 6. eeeeeee eee eeeeee 849 
The present paper continues the series on the collections made 
by Mr. Crossland in the tropics. The first was on Vubucellaria, 
published in the Journal of the Linnean Society, vol. xxx. 1907; 
then two parts in the ‘ Reports of the Sudanese Red Sea,’ 
ibid. vol. xxx1. 1909, and vol. xxxi. 1910; and the Cheilostomata 
from British Hast Africa and Zanzibar in the ‘ Proceedings’ of 
the Zoological Society, 1913. 
The bibliographical references are pretty full in order that, so 
far as the tropics are concerned, they may be used as a con- 
tinuation of Miss Jelly’s Catalogue. 
It should not be forgotten that all the specimens dealt with in 
this paper are from but a very slight depth (up to 10 faths.), so 
that but few Cyclostomata would be expected, since they mostly 
occur at considerable depths. 
Points of Special Interest. 
The ovicells of Hntalophora, and of Jdmonea radians Lam., 
have been studied full of embryos, and the occiostome has been 
cut through. In Jdmonea radians the ovicells form lobes between 
each series of zowcia. The ovicells must be more used in classi- 
fication, and the primary zoccia and the early stages must be 
examined. 
The rosette-plates of Reichert in Zoobotryon, instead of having 
a number of pores round a central pore, as described, have a 
central pore and 8-9 cells round the pore. The mass of cells 
in the neighbourhood of the pore are dealt with. 
27 species or varieties are mentioned in this communication, 
* Communicated by Cyrin Crossnanp, M.A,, B.Sc., F.Z.8. 
+ For explanation of the Plates see p. 807. 
