MADEEPORARIA. 763 



continuous over ridges, 1 — 2 mm. exsert, upper ends more or less horizontal up to 5 mm. 

 broad, subequal, about 1 mm. apart, sometimes more crowded, sides granulated ; teeth very 

 irregular, often small above, near the bottom of the valley passing into fine pointed teeth 

 or into blunt upstanding lobes, the latter from opposite ridges often fusing and forming the 

 first stages of the division into separate calices. Columella varying greatly in amount in 

 the valleys, being cut up where opposite septa fuse, either formed of the innermost pointed 

 teeth or of rounded trabeculae from most of the septa, always very loose and open. In 

 section endothecal dissepiments thin, very oblique 1 — 2 mm. apart, often at edge or where 

 growth is unfavourable causing the walls to appear exceedingly thick, extending up to within 

 2 mm. of the edges of the septa. 



The colony is very peculiar in the frequent fusion of large septa across the bottom of 

 the series. The septa on either side of these may curve a little away from them thus giving 

 an appearance in some parts of the series of the calicinal centres being distinct. 



Iiocality. A single specimen, the edge of a large flattened mass from the west reef 

 of Hulule, showing a much rounded living surface of 38 by 19 cm. 



14. Coeloria magna, n. sp. (PL LX. figs. 7 and 8.) 



Colony massive, underside, up to within 1 cm. of the edges, clothed with wavy epitheca, 

 at edge strongly costate. Series, short, longest 4 cm., average breadth about 15 mm., very 

 shallow, almost superficial or up to 7 mm. deep, calicular centres generally distinctly recog- 

 nisable. Walls thin at edge, in most parts appearing very bluntly pointed, and thick below 

 owing to the oblique character and supei-ficial position of the top exothecal dissepiments. 

 Septa thin, continuous (in some parts very irregular — often thickened almost vesicular — owing 

 to boring animals or small cirripedes), irregularly exsert (about 1 mm.), generally pointed, 

 but with scattered septa flat-topped (3 mm.) up to 3 mm. high, about 40 round a circum- 

 scribed calice, from (3 — 10 in 1 cm. in accordance with the presence or absence of minute 

 septa alternating with the larger, more crowded at edges of colony, sides granular ; teeth 

 minute, towards the inner ends of the smaller septa more pointed and longer, merging into 

 blunt, often two or three toothed paliform lobes on 12 — 18 of the septa of circumscribed 

 calices ; in the series septa occasionally joined across the valleys, dividing them up into fairly 

 distinct calicinal centres. Columella small, sometimes formed of the innermost pointed teeth 

 but more often of rounded, very lax trabeculae from at least half of the septa. Endothecal 

 dissepiments oblique to 30°, thin, 1".5 — 2'5 mm. apart, rather vesicular. 



The species, even more markedly than the last, shows the division of the valleys into 

 separate calices by the fusion of the larger septa from either side. It differs from Ed. & H.'s 

 species of Ulophyllia as described and figured. With the Challenger specimens, which seem 

 to me to be of one species, it has greater resemblances, but its shallow cells, breadth of 

 series, and septal characters serve to separate it, so far as our knowledge of variation at 

 present goes. Figs. 7 and 8 show two different parts of the colony. 



Locality. Addu, outer slope, 28 /"., a flattened massive colony, 41 cm. long by 27 cm. 

 broad and 7 cm. thick. 



G. 11. 98 



