858 ON BRYOZOA FROM ZANZIBAR. 
Fig. 4. Zoobotryon pellucidum Ehr. 250. Embryo in ovisac (0s.). Zocecial 
wall (zw.). This shows the embryo hollow, which 
is very generally the case in embryos of this type. 
5. Do. do. < 200. Disk of rosette-plate showing one small pore 
in the centre. 
6. Do. do. < 375. Disk of rosette-plate with a circle of cells 
round the pore. 
Ac Do. do. X 700. Section across the rosette-plate showing cells 
directed to the small opening; with meseuchym 
cells above. Only two of the radiating cells above 
the rosette-p'ate are shown, as the others are only 
seen in a different focus, but there will be 8 or 9. 
8. Do. do. X 330. Section across the rosette-plate in a septum of 
amain stolon. Showing a spreading plasma with 
cells scattered about. From the Sudan. 
9. Do. do. x 700. Section across the rosette-plate from the stolon 
to the zocwecium. 
10. Do. do. X 330. Section across the rosette-plate; above it there 
is an irregular granular mass. ‘This is in a zoceciuim 
in which there is an ovarium, and degeneration has 
taken place. 
iit Do. do. X 330. Section across the rosette-plate from a stolon 
to a zocecium, showing irregular granular masses in 
a zoccium that is degenerating. 
12. Do. do. < 330. Section across the rosette-plate from a stolon 
to a zocecium. 
In all cases the figures show the older part below the rosette-plate, and the 
younger above. 
Puate LV. 
Fig. 1. Amathia vidovici Hell. X 12. From Wasin. 
2. Do. do. >< 330. Section where a new branch is formed on each 
side, showing the cells round the two rosette-plates. 
The plug of cells on the lett are not cut close to the 
opening of the rosette-plate, and the two inner plugs 
have become somewhat granular. 
3. Amathia lendigeraL. 500. Section through the rosette-plate of the 
septum of the stolon. Examined with 1/12 
immersion. From Swanage. 
4. Do. do. X 25. Showing the branch at a bifurcation arising 
almost at right angles to the main stem. 
5. Crisia denticulata Lamk. X 330. Section through the inner wall of a 
zocecium, showing the connections from zocecium to zocecium (¢.). From 
Swanage. 
6. Crisia elongata M.-Ed.  X 250. Proximal end of zowecium—(a.) showing 
connection to the two neighbouring zoccia, through numerous tubes in 
which there is a septum in the middle, zocecial walls (w.). From Wasin. 
7. Stomatopora. Vrimary zowcium. X 85. 
8. Tervia irregularis Meneghini. Comb-like process in the zoccial tube near 
where it becomes erect. From Naples. 
9. Farrella atlantica Busk. X85. From Ras Osowamembe. 
10. Pedicellina spinosa Robertson. X 85. From Wasin. 
11. Do. do. x 25. 
12. Zoobotryon pellucidum Ehr. Natural size. From Chuaka Bay. 
