178 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
Vig. 4. Bugula neritina, var. minima, nov. Dorsal surface, x 25. From Khor Dongola. 
5. Do. do. Anterior surface, x 50. 
6. Do. do. Anterior surface, X 50. From Nersa Makdah. 
ilk Do. do. Mandible. x 85. 
8. Membranipora Savartii, Aud. Distal rosette-plates, x 25. 
Figs. 9,10. Do. do. Natural size. From Khor Dongola. 
Fig. 11. Do. do. x 25. Young zocecia. From Suakim. 
12. Do. do. x 25, Older zocecia showing small proximal denticles. 
18, Do. do. x 25. From Red Sea, lat. 16° N., 41° W. 
PLATE 12. 
Fig. 1. Membranipora limosa, sp. nov. Prepared with Eau de Javelle. > 25. From Khor 
Shinab (3). 
2. Do. do. Natural size. 
3. Do. do. x 12. Without the membrane beine removed. Shows the 
thickened walls and elongate zocecia at the bifurcation. 
4, Do. do. Transverse section decalcified, x 12. 
5. Do. do. Operculum, x 85, 
6. Microporella coronata, Aud. X 50. From Suez Docks (20). 
ihe Do. do. x 25. 
8. Do. do. Mandible, x 85. 
i). Do. do. Operculum, x 85. ; 
0. Membranipora bursaria, MacG. Operculum, x 85. From Engineer Island. 
11. Schizoporella unicornis, var. X 25. Showing the diagonal position of the zocecia. 
From s.s. ‘Thyra’ from the Mediterranean, docked in Suez (9). 
12. Schizoporella wnicornis, Johnst. Operculum, x 85. 
13. Do. do. Mandible, x 85. 
14. Rhynchozxoon corrugatum, Thornely. x 85. From the Gulf of Suez, in the Busk 
Collection in the British Museum. 
15. Do. do. x 25. From Suez Canal (14). 
16. Do. do. Operculum, x 85. 
7. Schizoporella argentea, Hincks. Mandible, x 85. From (2). 
ite Do. do. Operculum, x 85. 
PLATE 13. 
Fig. 1, Schizoporella viridis, Thornely. 25. From Khor Dongola. 
i 2. Do. do. x 25. Showing the zoccia irregularly heaped, and one com- 
plete ovicell, also one in course of formation in which the 
two calcareous walls are distinguished. 
3 Do. do. Oral aperture, x 86. 
4 Do. do. Mandible of vicarious avicularium, x 85. 
5 Do. do. Mandible of small avicularium, x 250; a x 85. 
6 Do. do. ‘Operculum, X 85. 
ie  ADGS do. Aperture of the ovicell, x 85, 
8. Do. do. Ovum in ovicell, x 85. 
9, Smittia marmorea, Hincks. x 50. From Suez (14). 
H 
= 
. Lepralia japonica, Busk. Shows ovicells and one broken-down ovicell, x 25. 
From Shukuk. 
Hale Do. do. Mandibie, x §85. 
12, Do. do. Operculum, x 89. 
———— 
