A. W. WATERS—REPORT ON THE BRYOZOA. 147 
ScHIZOPORELLA VIRIDIS, Thornely. (Plate 18. figs. 1-8.) 
Schizoporella viridis, Thornely, “ Manaar,” p. 116, fig. 3. 
Schizoporella spiculifera, Busk, MSS. 
The zoarium forms solid masses composed of many layers. The zocecia are 
distinct, ovate, raised, with large pits having one, or sometimes two, per- 
forations at the base, but between the pits there are very small raised nodules. 
Oral aperture subtriangular, with a small, acute, triangular avicularium at 
one or both sides of the sinus. There are large zocecial avicularia about the 
same size and shape as the zocecia, and the mandibles are long and narrow, 
with an indentation at the base. 
The opercula have two muscular dots some distance from the wall of the 
operculum, and the poster is wide. 
There are about 25 tentacles, and no oral glands in the sections cut. 
There are but few ovicells, and these are large and globular, wider than a 
zocecium. The ovicell is formed of two calcareous layers, and on the outer 
one there are raised ridges irregularly radial; between these ridges the pores 
of the lower layer are seen, these pores are much smaller and more numerous 
than those on the surface of the zocecia. An ovicell broken down and showing 
the two layers is figured (fig. 2). The opening of the ovicell, which is a 
transverse slit, is quite separated from the oral aperture. The ovicell of 
Cellepora serratirostris, MacG.*, has a somewhat similar opening. 
The large lateral umbo, figured by Miss Thornely, has not been seen on the 
Red Sea specimens, and occurs only sparsely in those from Manaar. 
S. viridis is in many respects like Cellepora Raigii, Aud. (pl. vil. fig. 10), 
but Savigny figures it with a denticle, and therefore we must suppose that it 
was Smittia. Pl. vii. fig. 11 of Savigny has similar vicarious avicularia, but 
both this and the last have spines, whereas none are seen in the specimens 
from the Red Sea. Scehizoporella ampla, Kirkpatrick +, from Mauritius, has 
similar zocecial avicularia : also Lepralia edax has vicarious avicularia. The 
solid masses and the irregular, sometimes erect, form of the zocecia would 
suggest Cellepora ; but we see the same thing in other Schizoporella, and are 
thus shown how artificial the zocecial characters of Cellepora were. 
Loc. Manaar, coral-banks (Th.); Mediterranean, Busk Coll., Brit. Museum, 
99.7.1.2366 (as S. spiculifera) ; Khor Dongola, dredged on dead coral, 3 fath., 
near Engineer Island (1). Mr. Crossland writes: “this green, inerusting 
species abounds on stones and old cables of the Elect. Tel. Co., Suakim ” ; and 
also says, “the neighbourhood of Engineer Island is characterised by this 
species ” [Khor Dongonab |. 
* Prod. Zool. Vict. dec. xiii. p. 109, pl. 128. fig. 2. 
t+ Ann. Mag. Nat. Hist. ser. 6, vol. i. p. 76, pl. 7. fig. 4. 
