﻿TUBERCULATE MONTIPOR^. 115 



irregularity of the tubercles, but there is too strong a tendency here for the tubercles to group 

 round the calicles, which is not observable in M. scdbricula. 



a. Warrior Island, Great Barrier Reef. CJoll. Saville-Kent. (Type.) 



? I, (Fragment) Albany Passage, Great Barrier Reef. „ „ 



90. Montipora annularis. (PI. XXIII. fig. 4; PL XXXIII. fig. 15.) 



Description. — Corallum builds up, stratum upon stratum, small irregular massive blocks, 

 the living layer being 3 mm. thick and without free edges. 



Calicles minute, 0'5 mm. in diameter, scattered, but often side by side in curved rows, 

 with slightly concave valleys between. Six thin, well developed septa, of which two as 

 directives reach far beyond the half radius cii'cle ; thin, delicate secondaries are irregularly 

 developed ; the septa appear round the inner margin of the protuberant membranous rings 

 which rise with the rings of tubercles. 



The ecenenchyma is very solid in section, A tendency to form thick, crowded trabeculas 

 is obscured by the thickness of the horizontal junctions. The tips of the trabeculse rise in the 

 interstitial spaces as minute fantastically branching tubercl es, the branches, uniting, form here 

 and there an irregular network of thin threads over a smooth floor with small pores scattered 

 about it. Round the calicles the tubercles rise high, closely packed and irregularly fused 

 together by solid white matter to form protuberant rings. Here and there these rings are 

 almost membranous. They are always conspicuous, though not more than • 5 mm. high. The 

 usually small tubercles in the concave valleys may here and there rise to be as tall as those 

 forming the rings, they then assume the ordinary rounded bushy appearance. There is a great 

 contrast between the delicate threads and tubercles of the surface and the solid trabeculce and 

 reticular threads of the section. 



There is only one small specimen which shows all the delicacy of surface texture 

 characteristic of the New Guinea specimens. The ornamentation of the surface seems to 

 be quite unique, and is especially marked by the sharply defined rings of tubercles forming a 

 kind of false protuberant calicle. 



a. New Guinea. Vienna Museum. (Type.) 



91. Montipora stilosa. 



Poriies stilosa {B.. and E.) Ehrenberg, KorallentMere (1834) p. 118. 



Maumpm-a stilosa, Dana, Zooph. (1848) p. 500. 



? Montipora sfylosa, Milne-Edwards and Haime, Cor., iii. (1860) p. 211. 



Montipora stilosa, Klunzinger, KorallentMere (1879) p. 30, pi. v. fig. 7, pi. vi. fig. 5. 



Description. — Encrusting (4 to 8 mm. thick), with free edges, one layer covering another 

 to build up massive blocks, surface rising into irregular lobes and knobs 5 to 15 mm. broad, 

 5 to 10 mm. high. 



Calicles inconspicuous, deep, margin very irregular, the tubercles standing back a little 



Q 2 



