534 MR. A. W. WATERS ON 



Fig. 10. llembranipora armata Haswell. Opercular region, seen from the interior.. 

 The opercular muscle is attached to a linear sclerite {sc.) on the mem- 

 branous operculum, and from the sclerite there is also a muscular band 

 to the tentacular sheath (f.s.). Two protoplasmic bands (h.) pass to the: 

 distal rosette-plate. X 50. 



11. Diplodidymia complioata Uss. X 6. Colony from Chuaka (506). 



12. Do. do. X 25. Lower part of colony . 



13. Do. do. X 85. 



14. Do. do. X 250. Operculum. 



15. Do. do. X 250. Mandible. 



Plate LXVIII. 



Fig. 1. Stirparia zanzibariensis, sp. n. X 85. From Chuaka, Zanzibar, 3 fath. 

 (506). 



2. Do. do. X 2. 



3. Scrn/pocellaria pilosa Aud. X 85. Dorsal surface. From Wasin, Brit. 



E. Africa, 10 fath. (500). 



4. Do. do. X 25. Anterior surface. 



5. ScrupoceUaria macandrei Busk. X 85. Dorsal surface, showing the 



groove extending beyond the vibracular chamber. 

 From Prison Island, Zanzibar Channel (505). 



6. Do. do. X 85. Anterior surface. 



7. JBicellaria cliuakensis, sp. n. Avicularium, X 250. 



8. Do. do. X 25. From Chuaka Bay, Zanzibar Channel, (515). 



9. ScrupoceUaria wasinensis, sp. n. X 25. Dorsal surface. From Wasin^ 



Brit. E. Africa, 10 fath. (522). 



10. Do. do. X 25. Anterior surface. 



11. ScrtqMceUaria ferox Busk. X 25. Anterior surface. From Prison 



Island, Zanzibar Channel, 8 fath. (505). 



12. Do. do. Mandibles — («) anterior, {h) lateral, X 85. 



13. Do. do. Base of vibracular seta, X 250. 



14. Do. do. Decalcified piece, showing the articulation with the 



chitinous tube already formed to the inside zocecia 

 of the new branch, X 25. 



15. Do. do. Dorsal surface, X 25. 



Plate LXIX. 



Fig. 1. Cauda retiforniis Pourt. X 25. From Ras Osowamembe, (504). 



2. Do. Do. Dorsal surface, X 25. 



3. ScrupoceUaria cervicornis Busk. X 25. From Wasin (522). 



4. Do. do. Dorsal surface, showing the articulation, X 25. 



5. Caberea eUisii Flem. Vibracular chamber seen from the inside: a, by 



vibracular chamber ; b, c, continuation of the groove beyond the 

 chamber. 



6. Candaretifor7)iisVoart. Dorsalsurface, to show the articulation. X about 6^ 



7. ScrupoceUaria ferox B. ~ 



8. ScrupoceUaria joUoisii Aud. 



9. FlabeUaris (Menipea) cuspidata B. 



10. Sugulopsis peacMi Busk. 



11. Menipea patagonica B. 



12. Menipea buskii W. Th. 



13. ? Metiipea ci/atJius W. Th. 



14. Stirparia zanzibariensis, sp. n. Showing basal stalk from which there are 



delicate rootlets, and also capsules nearly filled with a bright 3-ellow 

 substance. X 12. 



15. Swgula robusta MacG. Showing the earlier zooecia, X 25 ; a, natural 



size. From Wasin (501). 



16. do. do. Avicularium, X 85. 



17. ScrtipoceUaria wasinensis, sp. n. Zooecia showing the position of the 



ovaria (ov), testes (#.), rosette-plates (?•.). X 85. 



18. Do. do. Ovarian cells with protoplasmic threads from the 



rosette-plates, X 250. 



19. Do. do. Ovaria showing two nucleated ovarian cells, X 250. 



20. ScrupoceUaria ferox Busk. Band which starts near the distal end and 



passes down the side of the zooecium ; also small bundle of protoplasmic 

 threads running parallel with the granular band. X 350. 



