418 ON A NEW UKNUS Of BECENT FUNGIDA. 



centre, and from the radiation of septa from the sides and apex 

 of the primary piece to the edge of the disk or the margin. 



Columella absent. Septa numerous, order confused ; many 

 join others near to and remote from the margin. Larger septa 

 exsert, arched near the margin, from which they rise perpen- 

 dicularly, and low near the septa of the primary piece. Septa 

 dentate and strongly granular near their free edge, solid and stout. 



Costse broad, unequal, often bifurcating, variously directed. 

 At the margin each costa gives off a branch on either side to 

 form a septum with the corresponding offshoot of the next 

 costa. Hence the septa correspond with the intercostal spaces. 

 Intercostal spaces regularly furnished with equidistant syiiap- 

 ticula, presenting a regularly perforated appearance. Synapticuia 

 discontinuous, strongly developed between the septa, some reach- 

 ing high up in the interseptal loculi. There is no true wall, the 

 septo-costal structure being united by synapticuia alone. 



Species 1. Diafungia qeantjlata. (Plate XX.) 

 Corallum low, three times as broad as high. Primary piece 

 large and very distinct, with eight large costse and septa and 

 some offshoots. Septa without definite order, sixty in number, 

 those of the primary piece the longest. Many septa unite and are 

 slightly granular low down, but very granulate at the dentate 

 edge ; they are exsert near the margin, often wavy. Synapticuia 

 large and unequal. Costse very regular, some small ones come 

 off from the subeqiial large ones. The costse of the primary 

 piece the largest. On the larger costse there is a straight con- 

 tinuous TOW of minute granules, on either side close to the edge 

 of the intercostal s])ace, and between the rows a row of larger 

 granules. Sometimes this last is not seen, and in the smaller 

 costse it is usually wanting. Intercostal spaces well developed. 

 Synapticuia sunken, subequal, numerous, perforations very 

 symmetrically disposed. Derivation of a septum from two costse 

 very distinct. Length 6 millim. and 4"5 millim. ; height 1-75 

 millim. and 1'5 millim. 



Locality. Corean Sea, shallow water. 



The " primary piece " of this species was evidently the original 

 coral, and the surrounding portions grew subsequently. This 

 apparently broken and mended aspect is exactly like what is 

 seen in most specimens of species of Diaseris. But the regularly 

 perforated wall, and the curious forking of the costse at the 

 origin of the septa around the margin, distinguish the genera. 



