TSO 
Fig. 
Fig. 
co) 
Figs. 18, 19, 20, 21. 
Fig. 
to} 
MARINE BIOLOGY OF THE SUDANESE RED SEA. 
11. Smittia protecta, Thornely. Polypide removed from the zocecium, showing the 
small oral glands (g), the diapbragm (d), and the tentacles (¢). x 86. 
12. Thalamoporella Roxierti, Aud., X 25. From Ras el Millan. 
18. 
14. 
15. 
Do. 
do. 
Vicarious avicularian chamber, x 50. 
Thalamoporella Rozierti, Aud. Section of ovicell showing two larvee, of which 
Do. 
do. 
the right one is clearly older than the left. 
Mandible, x 85. From Ras el Millan. 
16. Holoporella pigmentaria, sp. noy., X 85. From Khor Dongola. 
fe 
OID op ww 
wo) 
Do. 
Figs. 18,19. Do. 
do. 
do. 
Operculum, x 85. 
Mandibles, x 250. 
PrLatE 16. 
. Holoporella Descostilsti, Aud., X 50. (ov) ovicell. From Suez. 
Do. do. Mandible, x 85. 
Do. do. Operculum, x 895. 
. Holoporella vermiformis, sp. nov., X 50. From Suez (20). 
Do. do. Mandibles, x 85. 
Do. do. Operculum, X 85. 
Do. do. Oral glands, x 8d. 
Do. do. Transverse section of oral gland, showing mesenchym-cells (m) 
on the wall of the sac and the homogeneous contents (he) within the sac. x 50. 
Do. 
Do. 
Do. 
Do. 
do. 
do. 
do. 
do. 
do. 
do. 
do. 
. Holoporella pigmentaria, sp. nov., X 50. From Khor Dongola. 
Do. 
Distal end of operculum; double outgrowth of cells to form 
tentacular sheath, x 300. From Khor Dongola. 
Distal end of operculum with digitiform process, x 300. From 
Khor Dongola. 
Distal end of operculum with tubular outgrowth and dark body 
at the end, X 300. From Ras el Millan. 
Operculum, showing the growth from the distal end, x 250. 
From Ras el Millan. 
Mass of cells causing the dark colour, x 25. From Khor 
Dongola. 
Cells more magnified. 
Showing how the brown-coloured mass spreads from the pore- 
tubes, first to the neighbouring ones and then over the whole of the front. x 50. 
17. Holoporella pertusa, Smitt. Operculum, x 85. Red Sea. 
Do. 
do. Mandibles, x 85. 
PLate 17. 
1. Chaperia tropica, sp. nov., X 25. From Gimsah Bay. 
Z, Schizoporelia nivea, Busk. Mandible, x 88. 
3. Do. do. Operculum, x 85. 
4, Do. do. x 25. From Ras el Millan. 
5. Smittia trispinosa, var. protecta, Thornely, X 25. From Ras e] Millan. 
6. Do. do. do. Mandible, x 85. 
7. Schizoporella Bernardii, Sav, & Aud., X 25. From Ras el Milian. 
8. Do. do. Operculum, xX 85. 
9 Do. do. Mandibles, x 250. 
10. Smttia tropica, sp. nov., X 25. From Ras el Millan. Showing the two kinds of 
avicularia. 
