﻿GLABRO-FOVEOLATE MONTIPOE^, 51 



suddenly flatten out like a spade for about 2 cm. from the top, the edge of which may be sharp 

 and ridged. Similar fiat vertical outgrowths may spring from the faces of these spade-Uke 

 expansions. 



Calicles evenly distributed about 1 diameter apart, 0*75 mm. Six primaries feebly and 

 irregularly developed round the margin, not reaching the half radius circle ; secondaries only 

 here and there indicated. Fossa in fuU-grown calicles very shallow and open, the base being 

 nearly level or filled up by a wheel-like arrangement of short septa with a large central but 

 very irregular columella. Where the coenenchyma is rapidly growing near the tips of the 

 branches the fossa is deep and conspicuous, and the calicles may be merely circular membranous 

 pits without septa round their apertures. 



Coenenchyma. The axial streaming reticulum'is laminate, the edges of the laminte forming 

 an even line pattern along the topmost crests and ridges of the branches. The cortical layer is 

 a stout open reticulum with only here and there slight traces of radial arrangement of its 

 component elements. This reticulum rises up in the interstitial spaces to form a uniform 

 system of ridges, as if the surface was slightly honeycombed. These ridges are sharpest and 

 tallest near the tips of the branches ; here the thin edges of the interstitial ridges slope slightly 

 upwards. In the lower portion of the coral the ridges are mere convex swellings of the 

 interstices, and these gradually flatten before the corallum dies down. 



There is only one specimen which I have succeeded in reconstructing from three fragments 

 which were recognised as belonging to one another. One of the fragments had been bleached, 

 the others retained their original yellowish-brown colour (see PI. IV. fig. 3). 



The columella is only faintly indicated in the figure (PI. XXXII. fig. 8). In some parts 

 it is quite a conspicuous feature even to the naked eye. 



a. Warrior Eeef Coll. Saville-Kent. 92. 12. 1. 377 (Types.) 



36. Montipora marenzelleri. 



Description. — Corallum small, branching, with smooth cylindrical stems from 6 to 7 mm. 

 in diameter. The branches form wide angles with the stem, and shoot straight out for about 

 1 • 5 cm. before dividing into new branches. 



Calicles are very conspicuous as deep round holes in the stem from • 5 to 0*75 mm. in 

 diameter, irregularly crowded, arranged not infrequently in close longitudinal series ; 

 transversely they may be nearly 1 mm. apart. Septal apparatus almost entirely obsolete, a 

 few minute points appearing in the younger calicles. 



CcEuenchyma shows a very delicate open band reticulum in the axes of the branches and 

 forming their friable tips ; this axial reticulum passes suddenly into a compact system of 

 radially arranged threads of irregular thickness and largely fused together to form a dense 

 cortical layer. When this is fuUy developed the stem is smooth, except for the minute 

 granular tips of the radiating threads. On the younger branches, before this cortical layer is 



H 2 



