﻿PAPILLATE MONTIPOE^. 83 



of the frond, knobs 4 to 5 mm. high and 4 to 5 mm. broad occur with six or seven calicles 

 scattered about over their surfaces. Here and there a calicle may be seen opening on the 

 tip of a papilla. 



The coenenchyma of the lateral reflexed surface is far more flaky than is that on the 

 upper surface. 



There is only one specimen of this papillate Montiporan. There was a suggestion on 

 the original label tha,t it is allied to M. scabricula, Dana ; with tliis I cannot agree, the latter 

 coral appears to belong to the tuberculate group while this is obviously papillate ; besides, 

 there is no similarity whatever in the manner of growth. 



a. Treasury Island, Solomon Islands. Dr. Guppy. (Type.) 



63. Montipora tuMfera. (PI. XVI. fig. 3 ; PI. XXXIII. fig. 6). 



Description. — Corallum a thin, freely expanding and bent plate which covers and arches 

 over previous growths to which at its centre it is attached, 1 to 1-5 mm. thick, supported by 

 epitheca to within 6 to 7 mm. of the edge. 



Calicles conspicuous but minute, 0*3 to 0*5 mm. in diameter, scattered, opening either 

 on the smooth surface of the coral, or at the ends of nariform hoods ; with very irregular 

 margins ; six short, thick, granular and very irregular septa. Hardly any calicles on the 

 under surface. 



Coenenchyma. The very loose, open-meshed streaming layer forms the great mass of the 

 corallum ; below, it deposits a thin, solid layer upon the epitheca, and above also it tends to 

 form a nearly solid layer which is developed only in patches. In the level bottoms of the 

 wavy coraUum, the surface is a smooth reticulum of a much finer and closer texture than 

 is that of the streaming layer ; while on the upwardly sloping portions of the stock, viz. 

 towards the growing edges, the surface rises in nariform excrescences of varying length, 

 from mere hood-papillse up to ridges 6 to 7 mm. long, gradually rising to a height of about 

 1 mm. They are often swollen a little at their tips and then descend abruptly ; while the 

 hood papillae invariably cover calicles, the long nariform ridges only occasionally have 

 calicles opening at their tips. They are only roughly parallel or rather radial. They wave 

 about and at the growing edge itself may meet and fuse, rising then to a greater height. 



This coral is closely allied to M. hilaminata from the same locality. But the calicles 

 are smaller and the specialisation of the surface ccenenchyma is quite distinct, although there 

 are slight indications of such nariform ridges on specimens of Ulaminata. The name tubifera 

 is suggested purely by the appearance presented by the nariform ridges, with calicles opening 

 at the flattened tips. The calicles do not, of course, run down within the ridges but descend 

 at a much more rapid slope towards the epitheca. Further, only a small proportion of the 

 calicles open at the tips of the ridges, the greater number open on the face of the coral, or on 



M 2 



