BRYOZOA FROM ZANZIBAR. 835 
MacG., in which the ovicell spreads over three or four series on 
one side only of the median line. 
FourtH. There is the very curious ovicell standing erect and 
embracing the zocecia of a series, which I described * as occurring 
in J. meneghini Hell., but from an examination of more material 
T came to the conclusion that it was /. triforis Hell., and a 
co-type has confirmed this conclusion, As described, there was 
little to distinguish /. meneghina Hell. from J. triforis Hell. 
except size, so that without a fair amount of material they were 
not readily distinguished. 
The zoceecial aperture of Jdmonea varies from 0:06—0°2 mm. 
The so-called J. wregularis Meneghini has the ovicell dorsal, 
and must be removed to Jervia. It has 13 tentacles. 
In Tubulipora there is an anterior ovicell spreading among 
many zocecia, with the oceciostome usually close up to a zoccial 
tube. Zocecial aperture 0°07-0°18 mm. Tentacles 11-12. The 
colony is, where attached, often provided with small projections 
or even long multitubular radicles, so that the attachment is but 
slight, whereas in Stomatopora it seems to be very close. 
In Filisparsa there is an anterior ovicell. 14 tentacles. 
In Entalophora few ovicells have been seen. In the proboscidea 
group they are not very large, and are near to several zocecial 
tubes without enclosing them. In wasinensis, the species 
described in this paper, the ovicell is very long and contains 
a considerable number of embryos. However, under /ntalophora 
many species have been included which have a distinct lamina, 
and in these the ovicells found are of the Diastopora type, and 
suggest that they are erect cylindrical Diastopora. Entalophora 
regularis MacG., and what I called #. rugosa dOrb., from 
the Mediterranean, must be removed on this account from 
Entalophora. 
The zoecial aperture of Hntalophora is 0:07-0:19 mm. The 
number of tentacles is 12-16. 
Diastopora. The ovicell is vesicular, as an irregular or sub- 
globular elevation, often involving many zoecia, and sometimes 
situated tangentially to the colony. The ovicell may spread 
internally with many arms, as in D. intricaria SmitttT. So far 
as seen, the oceciostome of Diastopora is a small plain tube, usually 
directed proximally. The zoccial aperture is 0:06—0°11 mm. % 
The number of tentacles counted is 10-12. The ovicells of a very 
considerable number of fossil Diastoporw have been figured, and 
the genus was abundant in the Jurassic and Cretaceous periods, 
and oceurs as Berenicea consimilis Lonsdale, in the Silurian (see 
fig. in Bassler, ‘ Bry.-Fauna of the Rochester Shale,” p. 16, pl. v. 
figs. 1-5, 1906). 
* “QOvicells of Cyclost. Bryozoa,” Journ. Linn. Soc., Zool. vol. xx. p. 278, pl. xiv. 
fig. 2 (1888). 
+ Waters, “Bryozoa from Franz Josef Land,” Journ. Linn, Soc., Zool. vol. xxix. 
p. 178, pl. xix. fig. 12 (1901). 
t In some fossils the orifice is larger, see Canu. 
