A W. WATERS—REPORT ON THE BRYOZOA. 259 
EXPLANATION OF THE PLATES. 
PLATE 24. 
¥ig. 1. Crista denticulata, Lamk. xX 25. -From Khor Dongola. 
2, Do. do. Ovicell, x 25. 
oO: do. x 25. Showing radicles growing from the distdl end of 
zoarium. 
4. Barentsia gracilis, Sars. X 25. Showing few spines on the calyx and stalk. 
From No. 5 Sudan. 
Amathoa tortuosa, T.-Woods (non Busk). x 12. From Suez (9). 
Amathia semiconvoluta, Lamx. X 12. From Wasin, Brit. E. Africa. 
Amathia distans, Busk. X 12.. From Zanzibar (527). 
Aetea Crosslandi, sp. nov. X 25. Khor Dongola. 
. Aetea lepadiformis, Waters. X 25. From Naples. 
10. Triticella Korent, Sars. X25. Basal rhizome showing raised areas at intervals, 
from which the stalk of the zocecium grows. From Kattegat, Denmark. 
WL. Do. do. x 85. 
12. Zoobotryon pellucidum, Ehr. xX 25. Basal growth with anchors. 
13.° Valkeria uva, L. xX 50. The rhizome seen from below, showing chambers from 
which the zocecia grow. From Naples. 
14. karella repens, Farre. Xx 25. Showing the creeping rhizome with the swellings 
from which a pair of zocecia grow. As a rule only one develops, but then there 
is a short tube opposite the zocecium. There are also two radicles which may 
yemain minute, or develop and carry fresh zocecia. From Poole. 
15. Zoobotryon pellucidum, Ehy. Gizzard, x 500. Section showing the teeth and the 
thick muscular sheath surrounding it. It will be seen that where the muscular 
sheath has become separated the contents of the teeth are attached to it, and 
more or less drawn out of the teeth. 
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PLATE 25. 
Fig.¥1. Cryptopolyzoon Wilsont, Dendy. ‘Transverse section of gizzard, x abont 1000. 
This shows the two solid “teeth” surrounded by the very powerful muscles, and 
at each end of the tooth there are small protuberances. It will be noticed that 
this is much smaller than the gizzards of other species. From Port Phillip 
Heads, Australia. Drawn as seen under 1; immersion. 
2p Do. do. Longitudinal section through the zocecium, X 250. 
3. Do. do. Longitudinal section showing the two teeth and the sections of 
the muscular wall, X about 1000. 
4 Valkeria uva,L.  X 25. Showing group of zocecia growing on joints. From the 
Sudan (21). 
5 Do. do. x 85. Zocecium showing the parietal muscles. 
6. Bowerbankia imbricata, Hincks. x 85. Showing empty zocecial chamber. 
7. Do. do, Showing zocecium with larva. 
8. Do. do. Showing ordinary zocecium. 
9. Do. do. x 500. Small portion of gizzard with the surrounding muscles. 
10. Do. do. x 85. Showing the radicle processes at the base of a pair of 
zocecia. From Poole. 
|. Crisia denticulata, Lam. xX 85. Showing the light thin mark below the aperture. 
From the Sudan (19). 
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