﻿64 MADREPOEARIA. 



The coenenchyma is loose and spongy, dense in section, but the surface reticulum is 

 rather smooth and flaky, perforated with round pores. It rises into sharp angular ridges 

 between the calicles on the broad faces of the leaves or branches ; and usually surrounding 

 the calicles with a polygonal rampart. These are specially prominent in the lower portion of 

 the corallum ; on the upper and young portions they first appear as underlips. 



Lamarck's original type of this coral is preserved in the Paris Museum. Of the five 

 small fragments, that numbered 256« is certainly one of the specimens referred to by Lamarck. 

 It is a very markedly foveolate Montipore, the ridges being clean, sharp, and smooth. But 

 not only do the interstitial ridges suggest the name angulata, but the edges of the growth are 

 also sharp and angular. 



On Milne-Edwards' suggested identification of tliis with Esper's Madrcim^ct phryrjiana, 

 see p. 133. 



Milne-Edwards also suggested that de Blainville's Hcliopora angulosa (Manuel, p. 392) 

 is synonymous with Lamarck's type; 



Locality, "Eastern Ocean." Type in Paris Museum (No. 256a). 



h. Eamosc. 



46. Montipora gaimardi. (PI. IV. figs. 5, 6 ; Pi. XXXII. fig. 17.) 

 ? Moniipcn-a pmitifffrmis, Verrill, Proc. Essex Inst., v. (1866) p. 26. 



Description. — Corallum forms small compact tufts of more or less cylindrical branches 

 (from 1 to • 5 cm. thick) ; these may taper off to a point or the tips may flatten and break up 

 into several small points. 



CaUcles are conspicuous (small, O'Sand less), uniformly crowded,. about 1 diameter apart, 

 with six prominent, usually thick and slightly exsert septa, often mare or less laminate, one or 

 two directives ; the second cycle also often regularly and symmetrically developed, but thinner 

 than the primaries. The septa often have T-shaped thickenings peripherally. These may all 

 unite to form a smooth rim right round the margin of the apertiu'e. 



The coenenchyma shows in section, a thick axial strand of open reticulum which takes the 

 lead in the carrying up of the branches either as tall tapering points or as- rounded or slightly 

 compressed knobs. The branchings are due to the dividing up of this axial reticulum. The 

 axial layer is sm-rounded by a much denser cortical layer of no- great depth and often rather 

 sharply marked off from the axial layer. At the sm-face the interstitial spaces tend to swell 

 into ridges which uniting give rise to a pronounced foveolation. These ridges frequently run 

 out into slight papiUte at th^ir points of intersection. On some specimens, these ramparts 

 may be high, and the calicles be sunk in a richly foveolate surface. On other specimens the 

 sm-face is evenly and slightly foveolate on one aide, smooth and stony on the other. 



