754 MR. J. STAKLEY GAEDIIS^ER OlST [Juiie 6, 



exotbeca. ,The valleys between tbe calices are always distinct 

 and usually about 3 mm. broad. Tbey are not eiosed ia below 

 by a deuse, smootli peritheca as represented in Milne-Edwards 

 and Haime's figure, but at tbe bottom tbe costee of neighbouring 

 calices meet. Tbe columella is situated about 1"5 mm. below tbe 

 crown of paliform teeth, tbe whole calice being 4-5 mm. deep. 

 Eotuma ; reef. 



5. Orbicella curta Dana. 



OrUceTla curta, Dana, Zoopb. p. 209, pi. x. fig. 3 (1846). 

 ' There is in this species always a distinct valley between the 

 calices, but the interthecal spaces are often filled up with dense 

 solid exotbeca. The calices have typically 48 septa in four cycles, 

 but usually the last cycle is incomplete. The first and second 

 cycles meet the columella ; the primaries are much coarser than 

 the rest, ending above in broad (1*5 mm.), slightly more exsert 

 edges, and below having generally small paliform teeth. The rest 

 of the septa are very thin and equally exsert with finely toothed 

 edges. The tertiaries often bend round and fuse with the 

 secondaries before the latter join the columella ; the quaternaries 

 are always distinct but very narrow. Tbe costse are of equal 

 thickness and meet in the valleys, but are not directly continuous 

 between the calices. The columella is small and formed by twisted 

 lamellae from the septal edges, which have from the surface rather 

 a papillate appearance. 



The calices in my specimen are rather irregular and a few 

 exhibit well-marked fissiparity. Tbe largest are from 8-9 mm. in 

 diameter by 5 mm. deep. 



Funafuti ; one specimen. 



6. Oebicella coeonata Dana. 



Orbicella coronata, Dana, Zoopb. p. 211, pi. x. fig. 4 (1848). 



There is one specimen of this species, which possesses very 

 markedly the specific characters given by Dana. The calices are 

 crowded, but have nearly always distinct rims ; tbe costte, however, 

 are sometimes continuous from calice to calice. The septa form 

 three cycles, of which the primaries are considerably (1 mm.) more 

 exsert than tbe secondaries and the latter than the tertiaries. The 

 costae also show similar differences. Tbe primaries have almost 

 horizontal upper edges, 2 mm. broad, and distinct, small, low, 

 paliform teeth. A few of the secondaries may meet the columella, 

 but generally they are little broader than the tertiaries. The sides 

 of all the septa are coarsely granular and the edges of all end in 

 fine, subequal spines. The columella is very small and formed by 

 a few flat trabeculse from tbe primary septa. 



The calices vary up to about 8 mm. in diameter by 4 mm. deep. 

 The primary septa are about 2 mm. exsert. 



Funafuti ; leeward reef. 



