Natural History of East Finmark. 127 



EXPLANATION OF THE PLATES. 



N.B. — The description of figures 1 and 2 in this Plate, Cnllopnra nigrans, 

 will be found in the preceding part of these papers, vol. xi. p. 593. 



Plate VIII. 



Fi(/. 1. Cal/opora nigrnns, Ilincks. a, young zocecium ; b, with avicularia ; 

 c, an unusual form of ocEcium in a part where growth is very 

 rapid and there are no avicularia. These zooecia, and also those 

 of fij>-. 2, not developed side by side, but brou^'ht here together 

 for illustration. Fig. h resembles state illustrated by Waters 

 from Franz-Josef Land. 



Fiif, 2. Callopora nigrans, Ilincks. n, early stage of development of 

 oojcium ; 6, the usual form of ooecium ; 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 ooecium, and the chambers in the 

 situation usually occupied by an ooecium. 



Fig. 4. Antropora graniilifera, 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 nodidosa, 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 ooecium represented in fig. 5 is seldom seen. 



Figs. 6 & 7. Ammatophora nodidosa, Hincks. The more usual forms of 

 the ooecium : fig. 6 the younger, fig. 7 the mature condition. 



Fig. 8. Lepralia nitida, Fabricius. Three bars of the zocecium, to show 

 their structure. 



Fig. 0. Lepralia tnelolontha, Laudsborough, Three front bars, to show 

 the structure. 



Fig. 10. Criljriiiiia annnJata, Fabricius. Three bars of the zooecium of a 

 very simple form of this species. 



Fig. 11. Cribrilina annulata^ var. spitsbergensis, Norman. Anterior por- 

 tion of a zooecium. 



Fig. 12. Gephyrotes nitido-pundata, Smitt. The anterior portion of a 

 zocecium, to show the structure of the bridge and oral openino-. 



Fig. 13. Gephyrotes nitido-piinctata, Smitt. Middle bars of the zooecium. 



Plate IX. 



Fig. 1. Cribrilina cryptooccium, Norman. Zooecium with ooecium iu 

 earliest stage of development as seen at the edge of a zoarium. 



Fig. 2. The same. An older zooecium, with the ooecium except the 

 front arch concealed beneath overgrowth, and a transverse rib 

 developed over it. 



Fig. 3. Cribrilina iniioininata, Couch. Three bars of zowcium : «, /;, 

 lateral papilla3 ; c, the opening outside the arch of the bars and 

 into the body of the Polyzoon, which a papilla has occupied. 



Fig. 4. Crihrilina Gattgce, Busk. Aiit(;rior portion of a zocecium of the 

 ordinary form. 



Fig. 5. Cribrilina Gattycp. Variety on shell from Guernsey, with inter- 

 esting duplicated lateral lacunes. 



Fig. 6. Crihrilina Balzaci (Audouin), Waters, from Madeira. 



Fig. 7. Cribrilina Jigular is, 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 bars. 



