280 
Transactions of the Society. 
in 1879, and in various papers have given their number and position, 
especially in fossil forms, and in my ‘ Challenger ’ Supplementary 
Beport figured several, and referred to them on page 18, &c. 
Plate VIL ( continued ). 
Fig. 23 . — Flustra crassa Busk. Distal wall X 25. 
„ 24. 
99 
tenella Hincks. „ x 25. 
25. 
„ „ Lateral wall x 25. a and b, rosette plates, as 
seen from the two sides x 85. 
„ 26. 
9 ? 
securifrons Pallas. Distal wall x 25. 
. 27. 
reticulum Hincks. Lateral wall x 25. 
.. 28. 
,, Distal wall x 25. 
„ 29. 
carbasea Ell. and Sol. Lateral wall x 25. a , rosette plate x 85. 
30. 
„ Distal wall x 25. 
31. 
cribriformis Busk. Lateral wall X 25. 
32. 
99 
„ Distal wall x 25. 
„ 33. 
„ dentigera Hincks. Lateral wall x 25. Showing the rosette plates 
near the base of the zooecium, denticles near the opercular wall, and an 
immersed ovicell. 
„ 34. 
99 
„ Distal wall x 25. 6, denticles X 85. 
Plate VIII. 
Fig. 1 . — Membranipora pilosa L. Section showing ordinary rosette plates and two 
gigantic ones x 25. 
„ 2. „ „ Section of small rosette plate, showing proto- 
plasmic connection x 250. 
„ 3. „ „ Section of gigantic rosette plate x 85. 
„ 4. ,, „ Showing protoplasmic connections x 250. 
,, 5 . — Flustra crassa Busk. From Station 149 D ‘Challenger.’ Showing ovi- 
cells and avicularium x 25. 
„ 6. „ biseriata Busk. From Station 196 ‘ Challenger.’ Transverse 
section, showing distal rosette plates, the bordering chambers ( bch ) and 
section of the projecting chitinous tube X 25. 
7. „ „ Showing the immersed ovicells and the lateral 
chitinous tubes X 25. 
,, 8. ,, „ Transverse section of bordering cells (b cli) as fig. 6, 
showing the chitino-calcareous band (c b) x 150. 
.»> 9. „ „ X 4. 
„ 10. „ reticulum Hincks. With avicularium and projecting chitinous 
tubes. 
99 
11 . 
12 . 
13. 
„ 14. 
„ 15. 
„ 16. 
„ 17. 
„ 19. 
., 20 . 
„ 21 . 
,, 22 . 
„ „ Dorsal surface X 2. 
„ oblonga sp. n. Showing the rosette plates in one zooecium all 
directed away from the centre x 25. 
„ „ Avicularian mandible x 85. 
„ tenella Hinks. „ „ X 85. 
„ Barleei Busk. ,, „ x 85. 
„ securifrons Pallas. „ „ X 85. 
,, denticulata Busk. Lateral wall, showing rosette plates, and the 
internal denticles x 25. 
,, „ Distal wall as above x 25. 
„ spinuligera Hincks. Lateral wall, showing ovicell, plates and 
denticles x 25. 
„ „ Distal wall x 25. 
„ reticulum H. Avicularian mandible x 85. 
„ biseriata Busk. From Station 196 ‘ Challenger.’ Lateral wall with 
rosette plates x 25. 
