OF THE MERGrTJI AKCHIPELAGO. 



5 



Pakacyathtjs intjictts, sp. nov. (Plate I. figs. 7-9.) 



The corallum is short, has a very expanded base with a consider- 

 able constriction above it : an elliptical calice, the long diameter 

 of which is on a lower plane than the shorter and as long as the 

 base is broad. Calice elliptical, deep, margin curved upwards at 

 the sides, and a slight downward curve at the extremities. Septa 

 numerous, unequal, in five cycles, all exsert at the margin, and 

 most of them overhanging slightly. The fourth and fifth orders 

 unite with the tertiaries not far from the columella, and the 

 highest orders unite with the fourth and fifth not far from the 

 margin. The edges of the primaries and secondaries are thin and 

 boldly curved convexity towards the fossa, the tertiaries are less 

 bowed, and the other orders have straighter or slightly wavy edges ; 

 but all are boldly crenulated with paliform edges. The sides of the 

 septa are spinulose. Pali small and in one lobe before the pri- 

 maries and secondaries, and resembling an outer papilla of the 

 columella before the tertiaries. The columella is deep, elongate, 

 concave, and consists of many processes united and resembling 

 the smaller pali. The costse are small, nearly equal, rounded, 

 barely projecting, and sparsely and minutely granular. 



Length of calice 14 millim., breadth 10 niillim., height 12 

 millim. The primaries and secondaries are exsert to the height 

 of 2 millim. Locality, Mergui Archipelago. 



Paeactathtjs c^eeuletjs, sp. nov. (Plate I. figs. 10-11.) 



The corallum is low with a broad base, a much constricted 

 stem, and a large shallow elliptical calice with a slightly everted 

 margin, and with marginal axes nearly in the same plane. 

 Septa in incomplete five cycles, very unequal, the primaries, 

 secondaries, and tertiaries being exsert ; none project much into 

 the widely open calice. The sides of the septa are roughly and 

 largely papillose. The pali are variable in number, those before 

 the first orders are double, one high and narrow and rounded, 

 the other small or absent. The pali before the combined higher 

 orders are usually in multiple series. Columella very large, con- 

 cave, processes numerous and united, the outer not to be distin- 

 guished from pali. CostaB low, subequal, narrow, and distinctly 

 granular. 



Height of corallum 8 millim. ; length of calice 12 millim., 

 breadth 9 millim. The colour of the septa, columella, and pali 

 is blue ; the costse usually dull white, some are brown. Locality, 

 Mergui Archipelago. 



