BRYOZOA FROM ZANZIBAR. 535 



Plate LXX. 



Fig. 1. Schizoporella nivea Busk. X 25. From Wasin (501). This may perhaps 

 he called var. ivasinensis. 



2. Do. do. X 85. Operculum. 



3. Do. do. X 85. Oral aperture closed by calcareous wall. 



4. Gemellipora protusa Thornely. X 25. From Wasin (520). 



5. Do. do. X 85. Operculum. 



6. Do. do. X 85. Interior of the zooecium showing the oral 



aperture. 



7. Scliizoporella nivea Busk. X 25. From Wasin (501). 



8. Do. do. X 150. Basal avicularium. 



9. Do. do. X 150. Lateral avicularium. 

 lO.lFetralia chuakensis Busk. X 25. From Chuaka, Zanzibar. 



11. Do. do. X 85. Operculum. 



12. Do. do. X 85. Mandible. 



13. Do. do. X 250. Mandible showing the creuulated border. 



14. Do. do. X 25. Dorsal surface showing spaces for the attach- 



ment of radicle tubes. 



15. Petralia vultur, var. armata, nov. X 85. Section through the zooecium, 



showing the tentacles, with two larger than the 

 others. 



16. Do. do. do. X 85. Operculum. 



17. Do. do. do. X 550. Section of tentacles ne.<ir the base 



showing the two large fan-shaped tentacles with 

 long nuclei near the edge. 



18. Do. do. do. X 25. Eau de Javelle preparation. From 



Chuaka. 



19. Do. do. do. X 85. Mandible of oval avicularium. 



20. Do. do. do. X 85. Mandible of round avicularium. 



21. Lepi-alia feegensis Busk. X 85. Operculum. 



22. Do. do. X 85. Mandible. 



PlATE LXXI. 



Fig. 1. Memlranipoi'a savartii And. Zooecia showing the network of protoplasmic 

 threads. In the upper zoojcium histolysis of the 

 polypide has commenced, and in the right hand 

 zooecium (}•) histolj^sis has progressed further, and 

 now considerable granular masses are formed. In 

 the lower zocecium, of which only the distal end is 

 shown, the polypide is in full vigour with digestion 

 active and the tentacles unaltered. Drawn from a 

 decalcitied mount, X 85. From Zanzibar Channel 

 (528). 



2. Do. do. Section showing plasma threads by the side of finely 



granular cord and parts of nanower cords, X 1000. 



3. Do. do. The granular masses shown in the right zooecium in 



fig. 1, X 150. 



4. Do. do. A similar mass shown in transverse sections sur- 



rounded by protoplasmic threads, X 1000. 

 6. ? Membratiipora armaia H&iweW. Mandible, X 85. 



6. Do. do. Decalcified avicularium showing retractor muscle (a), 



divaricator (6), with tendon attached to the mandible 

 in the middle of the base, and the "peculiar body" 

 (c), X 85. 

 Avicularium, X 85. 

 Lower portion of lateral gland, X 320. 

 Decalcified zooecium showing the avicularian chamber 

 on the left with muscles as in fig. 6, and the glan- 

 dular chamber (cfc.) on the right, X 85. 

 10. Do. do. X 25. From Wasin, Brit. East Africa (500). 



