REA SEA AND EGYPTIAN PORITES. 239 
249. Porites Red Sea 3. (2. Erythrew tertia.) 
[Red Sea, coll. Ehrenberg; Berlin Museum. | 
Syn. P. nodifera Klunzinger, Die Korallthiere des Rothen Meeres, ii. (1879) p. 41, pl. vi. fig. 13, 
pl. v. fig. 17. 
Deseription.—The corallum forms dendriform or tufted stocks, the branches dividing 
dichotomously. The terminal branches are bluntly digitiform, or shorter, lobulate, and often 
somewhat compressed. The stocks are from 3-12 em. high, the branches 2—3 em. broad, the 
terminal twigs 1-1'5 cm. across and 1-3 em, high. The living layer is always confined to 
these last named. 
The calicles are shallow, often almost superficial, 1-1°5 mm. across, 0°5-1 mm. deep. 
The walls are thin, almost trabecular—near the top with polygonal, often incomplete edges— 
“the walls are often not clearly separable from the septa.’ These latter are rather unequal, 
irregular, short, spiky, and trabecular. The ring of pali is not very conspicuous, often indistinct, 
since their trabecule frequently run in different directions. There is a central fossa within the 
ring of pali, but apparently without columella. 
This is Dr. Klunzinger’s description of a specimen (var. 8) of Ehrenberg’s Porites clavaria 
from the Red Sea, preserved in the Berlin Museum. The var. a, which was apparently based 
upon a figure of Savigny’s in his Deser. de |’Egypt, pl. iv. fig. 6, is referred to in Vol. IV. p. 99, 
of this Catalogue. 
Dr. Klunzinger compares it with Dana’s P. cylindrica (“? Feejee Isl.’). But the most 
striking characteristic of this latter species is the erect, neatly rounded stems, and the apparent 
absence of excavate cells. On the other hand, the limitation of the living layer to a depth of 
1-2 inches is common to both, 
Examination of Dr. Klunzinger’s photographs shows that the thin wall is often zigzag, a 
phenomenon already frequently described in the genus Goniopora, and that between the 
ragged irregular septa the interseptal loculi are large and conspicuous, so that the calicle is 
distinct. 
On Dr. Klunzinger’s suggested identification of this coral with the var. nana of Lamarck’s 
Porites conglomerata, see Part I1., among the forms from unknown localities. 
There is unfortunately no specimen in the British Museum from the Red Sea corresponding 
with this description. In the Paris Museum there is a specimen from the Seychelles labelled 
P. nodifera, but neither growth-form nor calicle structure corresponds with Dr. Klunzinger’s 
description (see p. 223). 
250. Porites Red Sea 4. (P. Erythraw quaria.) 
[Red Sea, coll. Klunzinger; Berlin Museum. | 
Syn. Synarea undulata Klunzinger, Die Korallthiere des Rothen Meeres, ii. (1879) p. 48, pl. vi. 
p. 12, pl. v. p. 30. 
Description.—The corallum rises into erect lobes or columns, with uneven wavy sides, 
fusing into solid masses or separated; their tops rounded or fusing to form a gyrate crest. 
