BRYOZOA FROM ZANZIBAR, 837 
Heteropora., ‘The ovicell is unknown in recent species, but 
Novak * figures one In a Cretaceous fossil. It is sac-like with a 
small opening at one end. ‘Tentacles 14 in /. pelliculata Waters. 
Supercytis has the ovicell at the end of the erect colony 
spreading over the whole width. The Supercytis tubigera Busk, of 
the ‘Challenger,’ is not related to Supercytis, nor is it correctly 
described, as the series ave not uniserial but biserial. It looks 
more like a Z’ubulipora. 
Crisulipora. Oceciostome tube narrower than the zoccial tube, 
without any terminal expansion, There are 10 tentacles. 
CRISIA DENTICULATA (Lamarck), (PI. IV. fig. 5.) 
Crisia denticulata Waters, “ Rep. Mar. Biol. of the Sudanese 
Red Sea, Bry. pt. u. Cyclost. etc.,” Journ. Linn. Soc., Zool. 
vol. xxxi, p. 232, pl. xxiv. figs. 1-3, pl. xxv. fig. 11 (1910); and 
add :— 
Osburn, “ Bry. of the Woods Hole Region,” cll, Bur. 
Fisheries, vol. xxx. p. 216, pl. xviii. fig. 8 (1912); “ Bry. from 
TLenaadi. etc.,’ Proe: Un. Sti Nat: Mus. vol. xliii. p- 276 (1912); 
Guerin- Ganivet, “Bry. de la Région de Concarneau, ete.,” Trav. 
Se. du Lab. de Zool. et de Phys. Mar. de Concarnean, ‘vol. ny 
p- 19 (1912); “ Mission Arctiques: Bryozoaires,” Soc. d’Océan. du 
Golfe de Gascoigne, p. 39 (1913); Osburn, “ Bry. of the Tortugas 
Islands, Florida,” Pub, 182, Carnegie Inst. of Washington, 
p. 185 (1914). 
We see that the connections from the stolons to the zocecia, or 
through the septa of the stolon, in Zooboiryon pellucidum Khy. 
(p. 849) and other Ctenostomata are much more elaborate than 
any description had indicated, a number of cells on each side 
meeting those on the other, and to these groups of cells reach the 
plasma network, which spreads through the stolon and the zoccia. 
However, in Crisia and other Cyclostomata, I have not found a 
plasma network spreading all through the zocecium, as we know 
it in Cheilostomata and Ctenostomata, but near the base below 
the ceecum there is a small number of threads. The polypide so 
nearly fills up the zoecial tube, that there does not seem to be 
room for much network of plasma. 
In Crisia and cther Cyclostomata, the number of connecting 
pores is very considerable, being situated generally all along the 
surfaces, and, as a rule, the zoccium at its proximal end is 
connected with the zoccia on the two sides, in such a way that 
it seems impossible to speak of a new zoecium having arisen 
from any one older zocwcium (PI. 1V. fig. 6). There are “but few 
cellsin contact with the pore, in this case apparently two on each 
side (PI. IV. fig. 5). 
Loc. Add: Arctic; Atlantic, Cape Verde Islands. Wasin, Brit. 
K. Africa, 10 fath. (601, 516). 
* “Bry. der béhmischen Kreideformation,” Denks. der Math.-Naturw. Cl. K. 
Akad. Wien, vol. xxxvii. pl. yini. figs. 80, 31 (1877) 
