132 MR. A. W. WATERS ON TUBUOELLARIA : 



The central branch is thicker than the lateral ones, which, however, are 

 lono- and do not ffive off many branches ; from the central one numerous long 

 branches grow on all sides. There are only four zooecia in a complete series, 

 whereas in T. cereoides and T. fusiformis there are six. 



The specimens were not in good condition for study, and no larvae have 

 been found in the peristomial ovicells. 



Loc. Wasin, Brit. East Africa, 10 fath. (501) ; Ras Osowamembe, 

 Zanzibar Channel, 10 fath. (504, 514) ; Prison Island, Zanzibar Channel 

 (505) : Chuaka Bay, Zanzibar, tow-net : all collected by Crossland. 



Busk in his 'Challenger' Report, p. 99, refers to a species as T. cceca, hut 

 no description is given, and from examination of the British Museum speci- 

 mens in the Busk collection I do not consider that it belongs to Tuhucellaria. 



D'Orbigny describes T. cZamto from the Faluns bleu, but no figure is given 

 and the description is insufficient. 



Tuhucellaria farnesince *, Neviani, also probably belongs to another 

 genus. 



T. marginata, MacG.f, fossil, looks like an erect form of his Anarthropora 

 {Lagenipora) tuberculata, which I believe is the A. horrida of Kirkpatrick. 



Onchopora ventricosa, hmnersa, and granidosa of HaswellJ all have a wide 

 sinus without projecting peristome, and do not belong to Tuhucellaria. 



EXPLANATION OF THE PLATES. 

 Plate 15. 



Pig. 1. Titbuccllaria fusifor77i{s, d'Orh. From Chuaka, Zanzibar. X 12. 



2. Do. Natural size. 



3. Do. Operculum. X 85. 



4. Tuhucellaria zanzibariensis, sp. nov. X 12. From Ras Osowamembe, Zanzibar 



Channel (504). The upper part shows the peristomial ovicells, while in the lower 

 part there are only ordinary zooecia. 

 o. Do. Natural size. 



6. Do. Operculum. X 85. 



7. Do. Transverse section. X 25. 



8. Tuhucellaria cereoides, Ell. & Sol. x 12. From Naples, showing the peristomial 



ovicells. 



9. Do. Operculum, x 25. 



10. Tuhucellaria cereoides, \ai\ c/iuakensis. X 12. From Chuaka. Piece treated with 



eau de Javelle shows the peristomial ovicell on the left. 



11. Do. Peristome. X 50. 



12. Do. Operculum. X 85. 



13. Do. Transverse section showing compensation-chamber. X 25. 



* "Bry. foss. delle Farnesina," Paleont. Ital. vol. i. p. 125, pi. 6. fig. 84, 1895. 



t Tert. Polyzoa of Victoria, p. 105, pi. 4. figs. 2, 8. 



X Polyzoa from the Queensland Coast, p. 36 (Linn, Soc. N. S. AVales, 1881). 



