BRYOZOA FROM ZANZIBAR. 857 
tubular projection, and from one of these a new zoccium may 
grow. Close up to the distal border on the dorsal surface there 
is on each side a small pore, which, however, is not seen in the 
Chatham Island specimens. Now I have previously remarked 
that most ‘* Beanie have six tubular connections, whereas this 
has only four,” so that there is reasonable ground for considering 
these as vestigial, thus representing six connections. Two pores 
are found in this position in several Cheilostomata, as Brettia, 
Cateicella, etc., and we may, perhaps, now see the significance of 
these spots or disks. 
The zocecia are about a third larger than those from the 
Chatham Islands and twice as large as those from New Zealand. 
The B. intermedia has been found in New Zealand, Tasmania 
(H.), Chatham Islands (W.), Red Sea (W.), Australia, Indian 
Ocean. 
EXPLANATION OF THE PLATES. 
Prate I. 
Fig. 1. Crisia inflata, sp.n. 25. From Wasin. 
Do. do. X 85. Showing ovicell. 
. Crisia elongata M.-Ed. X12. From Wasin. 
Do. do. Natural size. 
Crisia sertularoides Aud. X25. From Wasin. 
Do. do. x 3. 
Crisia circinata, sp.n. X12. From Ras Osowamembe. 
Do. do. X about 2. 
Do. do. X 25. Ovicell seen from the side. 
G2) C9) SSH Gm ONE COS) 
Puate If. 
Fig. 1. Entalophora wasinensis, nom.n. X 25. Showing ovicell. From Wasin. 
Do. do. x 60. Section of ovicells containing embryos. 
Do. do. X 330. Embryo. 
Do. do. X 85. Section of ovicell containing embryos. 
. Idmonea interjuncta MacG. X12. Showing ovicell with oceciostome (oe.). 
From Ras Osowamembe. 
. Idmonea radians, var. erecta Busk. X25. Showing ovicells with ocecio- 
stome (oe.). From Ras Osowamembe. 
Do. do. do. X 25. Longitudinal section of the ovieell. Cut 
parallel to the anterior and dorsal surfaces. 
Do. do. do. Natural size, showing the position of the ovicells 
Fig. a. Idmonea radians Lam. typica. Natural size. 
. Entalophora wasinensis, nom.n. X 330. Section of the surface pore-tubes ; 
(m.) exterior membrane. 
. Idmonea radians, var. erecta Busk. X85. Section from the anterior to 
the dorsal surface of the zoarium, showing the lobes of the ovicell and 
the ooeciostome (0e.) as well as the polypides (p.). The structure of the 
wall of the ovicell is seen at the left (s¢.) with one or two rosette-plates 
at the base of the broad pore-tube. There is an outer membrane (m.). 
Oo DM ST D MBO 
a 
i=) 
Puate III. 
Fig. 1. Mimosella bigeminata, sp.n. X85. Showing the lower internode with 
only a pair of zocecia, while the upper one has two 
pairs. From Ras Osowamembe. 
2. Do. do. X 6. Showing several stems growing from the creeping 
stolon. 
3. Do. do. < 85. Showing a new stem growing from the side of 
an old one after mutilation, 
