236 MADREPORARIA. 
246. Porites Persia 8. (P. Persica tertia.) 
[Islands of Lake Urmi (? Miocene), coll. Abich.] 
Syn. Porites polymorpha Abich, Mem. Acad. Sci. St. Petersburg (vi.), ix. 1859, p. 102, pl. ix. 
fig. 1, a, b, ¢, d, e. 
Description.—The corallum takes many forms, from encrusting to lobate and even 
branching. 
The calicles are shallow and 2 mm. in diameter, and the walls are thick and porous, 
frequently appearing incomplete, so that the interseptal loculi of adjacent calicles communicate 
across. There are only twelve septa, with slightly granular edges. A lamellate streaming 
layer can be seen in the axis of the stems. 
Stems of this coral are sometimes found hollowed out. 
This coral must, at least provisionally, be classified here. The conditions of the septa 
were admittedly difficult to unravel. The result arrived at by Dr. Abich that they were twelve 
in number remains the last word, but does not fix the generic position (see Introduction, p. 12). 
We must further point out that the size of the calicles, 2 mm., is large for a true Porites. 
Group VI._RED SEA AND EGYPT. 
247. Porites Red Sea gl. (2. Erythrew prima.) (Pl. XXXIIL. fig. 7.) 
[ Koseir,* coll. Klunzinger; British Museum.t] 
Syn. Porites solida Klunzinger, Die Korallthiere des Rothen Meeres, ii. (1879) p. 42, pl. vi. fig. 14, 
pl. v. fig. 21. 
‘ Deseription—The corallum is massive, often of immense size, convex or globular, with 
humpy and uneven surface. 
The calicles are of unequal size, mostly 1:5 mm., very deep, except round the lower 
margin of the stock. The walls are thin, sharp, straight (not zigzag), membranous, here almost 
without perforations and consequently with nearly straight edge, there perforated and the edge 
broken up into frosted granules; here and there the wall proliferates into a small mass of 
reticulum, probably where a new bud is to appear. The septa are very thin, and their very 
* On the outer slopes and ridges of the reef (“am Abhang und auf der Klippe oben ”) see 
Klunzinger, 1. ¢. + Other specimens are in the Berlin Museum. 
