Natural History of Eust Finmark. 127 
EXPLANATION OF THE PLATES. 
N.B.—The description of figures 1 and 2 in this Plate, Callopora nigrans, 
will be found in the preceding part of these papers, vol. xi. p. 593. 
PuaTeE VIII. 
Fig. 1. Callopora nigrans, Hincks. a, young zocecium ; 6, with avicularia; 
ce, an unusual form of ocecium in a part where growth is very 
rapid and there are no avicularia. These zocecia, and also those 
of fig. 2, not developed side by side, but brought here together 
for illustration. Fig. 6 resembles state illustrated by Waters 
from Franz-Josef Land. 
Fig. 2. Callopora nigrans, Hincks. a, early stage of development of 
ocecium; 6, the usual form of owcium; c, a form of which I 
have only seen two or three examples (it is this form which is 
figured by Hincks). 
Fig. 3. Larnacicus corniger, Busk, with ocecium, and the chambers in the 
situation usually occupied by an ocecium. 
Fig. 4. Antropora granulifera, Hincks. View of the back of a zocecium: 
a, openings resulting from the avicularia; below these are seen 
the pair of lucid bays, and below again the lucid spots. 
Fig. 5. Ammatophora nodulosa, Hincks. This and the following two 
figures have been taken from specimens in which the epitheca 
has been removed in order to show the structure. The form of 
the ocecium represented in fig. 5 is seldom seen. 
Figs. 6 & 7. Ammatophora nodulosa, Hincks. The more usual forms of 
the ocecium: fig. 6 the younger, fig. 7 the mature condition. 
Fig. 8. Lepralia nitida, Fabricius. Three bars of the zocecium, to show 
their structure. 
Fig. 9. Lepralia melolontha, Landsborough. Three front bars, to show 
the structure. 
Fig. 10. Cribrilina annulata, Fabricius. Three bars of the zocecium of a 
very simple form of this species. 
Fig. 11. Cribrilina annulata, var. spitsbergensis, Norman. Anterior por- 
tion of a zocecium. 
‘ig. 12. Gephyrotes nitido-punctata, Smitt. The anterior portion of a 
zocecium, to show the structure of the bridge and oral opening. 
Fig. 13. Gephyrotes nitido-punctata, Smitt. Middle bars of the zocecium. 
PLATE IX, 
hig. |. Cribrilina eryptoecium, Norman. Zocecium with ocecium in 
earliest stage of development as seen at the edge of a zoarium. 
. The same. An older zocecium, with the ocecium except the 
front arch concealed beneath overgrowth, and a transverse rib 
developed over it. 
. Cribrilina innominata, Couch. Three bars of zocecinm: Gp lop 
lateral papillae ; ¢, the opening outside the arch of the bars and 
into the body of the Polyzoon, which a papilla has occupied. 
Fig. 4. Cribritna Gattye, Busk. Anterior portion of a zocecium of the 
ordinary form. 
Fig. 5. Cribritima Gattye. Variety on shell from Guernsey, with inter- 
esting duplicated lateral lacunes. 
Fig. 6. Cribritina Balzact (Audouin), Waters, from Madeira. 
Fig. 7. Cribrilina figularis, Johnston, showing the very large lumen-pore 
on the base of the bars, the small lateral lacunes, and narrow 
chinks (? openings for papillae) between the loops of the bays, 
a 
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