BRYOZOA FROM ZANZIBAR. 533 



Plate LXV. 



Vittaticella elegans Busk. X 25. Showing large avicularium. From 

 Prison Island, Zanzibar Channel (503). 



Mandible ot'large avicularium, X 85. 



Small avicularium, X 150. 



Distal end, showing the avicularium, X 85. 



Showing internodes composed of many zooecia with 

 ovicells, X 15. (503). 



Section of embryo in ovicell, X 400. 



Section showing zocecia with polypides and ovicells 

 {ov.) in position, X 85. 



8. Vittaticella elegans, var. zanzihariensis, nov. Distal end, showing the 

 avicularium, X 85. From Wasin, Brit. E. Africa 

 (500). a, mandible, X 250. 



9. Do. do. do. X 50. Showing small avicularium on the 

 dorsal surface near the distal end. 



10. Do. do. do. Upper half of the contents of the vittje, X 250. 

 From Prison Island, Zanzibar Channel (505). 



11. Do. do. do. X 85. Showing internal zocecial muscles. 

 (505.) 



12. Do. do. Semidiagrammatic transverse section through the 

 vitt»! (y.), X about 200. 



13. ? Bifaxaria vagans Thornely. X 25. From Wasin (500.) 



14. ' Do. do. Opei-culum, X 85. 



15. CJilidonia cordien And. Section showing muscles (m.) from the parietal 

 wall to the base of the chamber, X 250. From 

 Wasin, Brit. E. Africa (500). 



16. Do. do. Operculum, X 250. a, mandible, X 85. 



Plate LXVI. 



. 1. Stirparia exilis MacG. X 25. Only the lower part of the tuft is shown. 

 From Wasin, Brit. E. Africa (522), 20 fath. 



2. Do. do. X 2. 



3. Do. do. X 85. Stem showing disc from which a fresh branch 

 grows. 



4. Stii'paria dendrograjota, sp. n. X 25. Only the lower part of the tuft 

 is shown, and for clearness onlj' a few of the spines 

 are drawn full length, but are shown as broken off, 

 which is frequently the case. A pair of radicles are 

 shown growing from the base of a node. From 

 Chuaka, Zanzibar (508), 2 fath. 



X 250. Avicularium. 



X 25. First zooscium of a tuft, showing long spines. 



X 85. Dorsal surface, showing the polypide in the 



zouecium with ovaria (ovar.). 

 X 2-50. Ovarium from below the polj'pide, with one 



ovarian cell. 

 X 2. On the left a few zocecia are shown in a natural 



position ; the others are spread out as in a mounted 



slide. This piece is entirely irnattached. 



Plate LXVII. 



Fig. 1. Cellaria ivasinensis, sp. n. X 25. Specimen prepared with Eau de 

 .Javelle, showing the openings of the ovicell in an 

 enlarged pai't of the zoarium. From Wasin. 



2. Do. do. Mandible, X 85. 



3. Do. do. Showing the frontal membrane, with the trabecula'a)id 



the tessellated area below the operculum, X 85. 



4. Do. do. Tessellated area, X 250. 



5. Do. do. Avicularium prepared with Eau de Javelle, showing 



the plate in the submandibular part. X 85. 



6. Do. do. X 3. 



7. Cellaria gracilis, var. tessellata, nov. Tessellated area, X 250. From 



Ras Osowamembe. 

 Eigs. 8, 9. Farcimia oculata Busk. Stalk growing from stolon, X 26. 



36* 



