A. W. WATERS—REPORT ON THE BRYOZOA. 181 
Figs. 11, 12. Smttia tropica, sp. nov. Mandibles, x 85. 
Fig. 13. Do. do. Decalcified, showing the operculum of the ovicell (00) 
and the oral operculum (op), x 85. 
14. Do. do. Peristome and proximal end of the ovicell. The 
ridges in the peristome are seen distinctly in the semitransparent walls. x 85. 
‘15, Lepraha Montferrandi, Say. & Aud., x 25. From Ras el Millan. 
16. Do. do. Operculum, x 85. 
Riessi@le.Do. do. Mandibles, x 250 & 85. 
Fig. 19. Smittia nitida, Verrill, x 25. From Ras el Millan. 
20. Dor do: Mandible, x 85. 
21. Lepraha sp. Primary zocecia, X 25. 
22. Holoporella pigmentaria, sp. nov., X 25. From Ras el Millan. av, avicularia. 
23. Do. do. Minute avicularium, x 85. 
PLateE 18. 
Fig. 1. Retepora abyssinica, sp. nov., X 25. From Lat. 16°N., long. 41° W. 
2. Do. do. Aperture, x 85. 
3. Do. do. Dorsal avicularium, x 85. 
4. Do, do. Operculum, x 85. 
3. Do. do. Anterior mandible, x 85. 
6. Do. do. Dorsal mandible, x 85, 
lis Do. do. Dorsal surface, x 25. 
8. Do. do. Natural size. 
9, Do. do. From older part of a colony, x 25. 
10. Do. do. Aperture from older part, x 85. 
11, Retepora jermanensis, sp. nov., X 25. From Um el Jerman. 
Figs. 12,13. Do. do. Aperture, x 85. 
Fig. 14. Do. do. Operculum, x 85. 
15. Do. do. Mandible, x 85. 
16. Do. do. Natural size. 
17. Gigantopora fenestrata, Sm., x 25. Three of the zocecia near the distal end are 
as yet without any arch, but there is an indication of the 
formation of the avicularian chambers. From Lat. 16°45’ N., 
long. 40° 30’ W. 
18. Do. do. Mandible, x 85. 
19. Do. do, Operculum, x 85, 
20. Holoporella aperta, Hincks, X 85. From Ras el Millan. 
Figs. 21, 22. Do. do. Mandibles, x 85 & 250. 
Fig. 23. Do. do. Operculum, x 85. 
24, Retepora hirsuta, Busk. Piece prepared with Eau de Javelle, x 25. From Lat, 
16° N., long. 41° W. 
25. Do. do. Mandible, x 85. 
26. Do. do. Operculum, x 85. 
LINN. JOURN.—ZOOLOGY, VOL. XXXI. 15 
