INDIAN OCEAN PORITES. 229 
This is the description of a Porites from Nossibé, Madagascar, the growth-form of which 
is compared with that of P. mucronata and P. palmata, but which differs from all known 
species of Porites in the great depth of the calicles. 
From the figures we gather that at the tips of branches the walls are thin and 
membranous, but that they gradually become flaky or reticular. The twelve very echinulate 
septa slope away round the fossa as a series of diminishing granules, and without fusing 
into pairs. No pali are shown in the drawing of an enlarged calicle. Cf. the calicles of 
P. Providence Island ? (Pl. XX XIII. fig. 5.) 
There are many Porites in the National Collection with deep calicles, but none with 
calicles so large as 2°5 mm. 
Here I should note that the coral figured by Esper as Madrepora conglomerata (Suppl. 1. 
pl. lix.) is a branching Poritid with deep conical calicles, and came from Madagascar. It has 
hitherto always been regarded as a Porites (the P. conferta of Dana). But as it had fifteen 
septa, it should have been placed in the genus Goniopora in Vol. IV. (See Part. II. of this Volume.) 
Esper’s variety of his M. conglomerata (Suppl. 1. pl. lixa), which is a massive glomerate 
form, came out of an old collection without locality. It is now quite impossible to identify it. 
DAR-ES-SALAAM AND ZANZIBAR. 
239. Porites Zanzibar 1. (P Zanzibarensis prima.) 
{ Zanzibar, coll. Dr. Stuhlmann; Hamburg Museum.] 
Syn. “ Porites conglomerata Esper” Rehberg, Abh. Naturw. Verein Hamb. xii. (1892) p. 47. 
This is merely a record of a Porites said to have a branching growth-form resembling that 
shown in Esper’s figure (Suppl. p. 74, pl. lix), which represented a Goniopora, and was from 
Madagascar. 
There is no record as to the character of the calicles. 
240, Porites Zanzibar (92. (P. Zanzibarensis secwnda.) 
[Zanzibar, coll. Dr. Stulhamann ; Hamburg Museum. } 
Syn. ‘ Porites solidus” Rehberg, Abh. Naturw. Verein Hamb. xii. (1892) p. 48. 
Dr. Rehberg records, though without description, large specimens of a Porites which he 
believes to be of the same species as those found by Dr. Klunzinger in the Red Sea and called 
by him P. solida. (See below, P. Red Sea I, p: 236.) 
