1 



PROF. P. M. DUNCAN ON THE MADREPORARIA 



above which there is some constriction, and a compressed ellip- 

 tical calice. The calice is deep, broad at the margin, where the 

 longer axis is on a slightly lower plane than the shorter. The 

 septa are in nearly complete five cycles, slightly and unequally 

 exsert, unequal in breadth, close, projecting outwards slightly at 

 the margin, and only the primaries and secondaries projecting 

 much into the calice. First three cycles nearly equal in size ; 

 the septa of the fourth cycle of a half- system unite with the ter- 

 tiary, and the highest orders may unite with the fourth and fifth 

 higher up in the calice. All are sharply spinulose at the sides, 

 and the larger septa have plain and lobed margins, the others 

 being crenulated. The pali of the primaries and secondaries are 

 bilobed, rounded, and the upper lobe is large ; those of the ter- 

 tiaries and combined orders are smaller, much subdivided, and 

 stout. The columella is small, deeply seated, concave, papillose, 

 and the outer processes resemble the small pali. Costse sub- 

 equal, broad, low, large in relation to the smaller septa, and 

 minutely granulated ; some project near the calice. 



Height 12 5 millim. ; breadth of calice 10 millim., length 14 

 millim. The septa are coloured brown. Locality, Mergui Archi- 

 pelago. 



Paracyathus profundus, sp. nov. (Plate I. figs. 4-6.) 



The corallum is short with a broad adherent base, above which 

 there is a slight constriction, very slightly compressed at the sides, 

 and the calice equal to the base in diameter. Calice elliptical, deep 

 and open ; marginal planes on the same level. Septa unequal, 

 very crowded, in incomplete five cycles, very slightly exsert 

 and not projecting much into the calice. The fourth and fifth 

 orders unite with the tertiaries near the columella, and all are 

 ■pinulose at the sides, and the larger are lobed. Pali of the 

 larger septa trilobed and large, and those of the tertiaries are 

 •tout, numerous, ;md crenulated. Columella deep, concave; 

 papilla* numerous and ragged and united at their bases. Costa? 

 Hube<| i j ;i I , large, broad, granular, and with marked grooves between 

 them near the calice; and less ho lower down. 



J I « lit 7 in ill iin.; length of calice 11 millim., breadth of calice 

 10 millim. The dry corallum has the septa, pali, and columella 

 of a brown colour, the reat being white. Locality, Mergui 



A rchipelago. 



