176 MARINE BIOLOGY OF THE SUDANESE RED SBA. 
RETEPORA ABYSSINICA, sp. nov. -(Plate 18. figs. 1-10.) 
Zoarium branched in one plane, not reticulated, branches thick. The size 
of the zoarium may exceed 40 mm. The central zocecia have large avicularia 
on a raised chamber, and with the end raised and sometimes bifid, directed 
laterally or downwards. The mandibles are broadly triangular (fig. 5). 
The labial pore is distinct and the fissure is well-marked. The ovicells are 
cucullate, with a slit in a thinner median part of the ovicell ; and the ovicell- 
wall is prolonged downwards into the oral aperture by a subtruncate lamina, 
looking just like a uvula, and this structure, which occurs in some other 
species, is referred to in my paper on Leefepora, Journ. Linn. Soc., Zool. 
vol. xxv. p. 260. 
The dorsal surface has vibices, and in the area thus formed there is a long 
narrow avicularium with the mandible pointing downwards (fig. 6). 
In the older part of the zoarium (fig. 9) the aperture is depressed, and 
there are stout vibices passing diagonally from aperture to aperture ; the 
peristome has a suboral notch, and at the side of this there is a small avicu- 
larium which sometimes is circular, at others elongate and distinctly bifid at 
the end (fig. 10), but well within the aperture. 
The are about 13 tentacles. 
This species in general appearance so closely resembles /. Solanderia™, 
Risso, that at first it was taken for that species; but, besides other differences, 
the dorsal avicularia, instead of being directed diagonally upwards and having 
the same shaped mandibles as the anterior, are directed straight downwards 
and have a narrow mandible. Calvet ¢ describes R. Solanderia from Corsica 
and figures the operculum, which differs entirely from that of the present 
form, and is similar to that of Cellepora coronopus, 8. Woods, and so unlike 
the operculum of any Retepora as to be a considerable puzzle. 
Thus /. abyssinica is much like the fossil 2. coriensis of MacGillivray {, and 
there are points recalling R. yigantea, Busk, from which, however, it is 
distinct. It also is very closely allied to R. marsupiata, Smitt, and further 
material may possibly show that it should be called marsupiata. 
Loc. Red Sea, lat. 16° N., long. 41° W., 30 fath., collected by Loftler & 
Siemens. 
RETEPORA JERMANENSIS, sp. noy. (Plate 18. figs. 11-16.) 
Zoarium small, cup-shaped (15-20 mm. across), with very small fenestree. 
The labial sinus is quite at one side, and in the lip there is a fairly large 
triangular avicularium, while about the middle of the surface of the zocecium 
* See Waters, Journ. Linn. Soc., Zool. vol. xxv. (1895) p. 264. 
t “ Bry. Marins des cétes de Corse,” Tray. de l’Inst. de Zool. de l’Univ. de Montpellier, 
ser. 2, Mém. xii. p. 35, pl. 2. figs, 5-8, 
{ ‘Tert. Polyzoa of Victoria,’ p. 116, pl. 15. fig. 19. 
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