456 Mr. G. Brook on new Species of 



inner part of the wall short and the margin much rounded ; 

 aperture elliptical ; diameter 2*2 to 3 millim., length 2 to 3 

 millim. 



The species is quite distinct from any which have come 

 under my notice, but unfortunately the habitat is not recorded. 



Madrepora coronata. 



Corallum cespitose, or in large specimens forming broad, 

 much flattened clumps from an incrusting base. Branches 

 short, crowded, acervate, undivided except near the margin, 

 often broadest at the apex ; length 1'2 to 3 centim., diameter 

 5 to 7 millim. at the base, but often 1 centim. at the apex. 

 Apical corallites cylindrical, 2 to 3 millim. diameter and 

 4 millim. exsert, usually two or more corallites surrounding 

 the axial one are of the same dimensions. Lateral corallites 

 large, appressed, but with wide aperture; form variable, 

 nariform at first, but dimidiate tubular or funnel-shaped 

 later in growth ; length 2 to 4 millim., diameter 1*5 to 2"5 

 millim., crowded near the apex, distant and less prominent 

 below. 



Great Barrier Reef (SaviUe-Kent). 



Madrepora decipiens. 



Corallum consisting of stout subprostrate branches with 

 erect digitiform branchlets or more slender and irregularly 

 fastigiate. Apical corallites cylindrical, 2*5 to 3 millim. 

 diameter, not over 2 millim. exsert. Lateral corallites 

 crowded, of two kinds — the one stout and prominent, some- 

 times bearing buds, the other small, labellate, subimmersed 

 or immersed ; the prominent ones are cylindrical, with a more 

 or less deep notch in the inner part of the wall, elongate and 

 appressed near the apex, spreading and shorter below ; length 

 2'5 to 6 millim., diameter 2 to 2*2 millim. 



Great Barrier Reef [Saville-Kent). 



Madrepora Elseyi. 



Corallum cespito-arborescent ; branches sometimes rela- 

 tively long, with a cluster of branclilets near the apex, at 

 other times resembling M. hrevicollis in habit. Branches 1 to 

 1*5 centim. diameter ; branchlets numerous and acuminate. 

 Apical corallites 2 to 3 millim. diameter. Lateral corallites 

 ascending, tubular ; wall thick ; margin much rounded ; 

 inner part of the wall often shorter; average length 2'5 

 millim., diameter 1*5 to 2 millim., becoming verruciform 

 ])elow ; many proliferous corallites occur at intervals. 



