1876".] AND LITTORAL CORALS. 441 



slightly prominent, unequal, very numerous, perforated here and 

 there, close together, and spinulosely granular, the grains being few 

 and large. There is an epitheca, which reaches upwards from the 

 base a short distance ; and the wall is thin and reticulate. The 

 calicular fossa is wide and shallow ; the columella is oval and 

 moderately large ; and there are more than five cycles of septa in 

 each of the six systems. The septa are thin, not exsert, long, and 

 unite not far from the columella, and near the wall the larger are 

 perforate. 



Height jij- y 8 jj inch. Breadth of calice y\- y 4 ^ inch. 



Locality. St. Helena, on an Ostrea ; probably 1 1 fathoms. 



(Sent as having come up with an anchor from a great depth.) 



Balanophyllia striata, sp. n. (Plate XLI. figs. 7-9.) 



The corallite is tube-like, there being but slight alteration in the 

 breadth of the cylindrical and bent form during growth ; it is 

 long, slender, bent, and fixed by a wide base. The costae are 

 numerous, subequal, close, faintly granular ; and the synapticulse are 

 visible on the intercostal spaces where the costse have been worn, but 

 not otherwise. There is an epitheca inferiorly. The costse do not 

 project upwards at the calice ; but those of the primary and secon- 

 dary septa and sometimes of the tertiary are a little higher than the 

 others. The wall is thin at the margin, and the reticulation is 

 slight. The calice is circular in outline, very deep ; and the columella 

 is very small, and appears as a few scattered papillae. The septa are 

 thin, long, not prominent, and do not reach far into the centre at 

 the margin ; but the larger reach far inwards at the base of the 

 fossa. The larger are plain, and the rest are denticulate. The 

 union is made close to the wall and halfway down the calice. 



Height ly 1 ,-, inch. Breadth of calice y rt - inch. 



Locality. Found with the species just described. 



Genus Placopsammia, Reuss. 



Placopsammia darwini. (Plate XL. fig. 4.) 



The corallum has a broad ascending base, which narrows suddenly 

 and is continued upwards as a cylindrical tube-like corallum, one 

 diameter being slightly greater than the other. Buds project from 

 the same height as the parent, in a whorl, and pass upwards and 

 outwards. There is no epitheca ; and the costee are well developed, 

 nearly equal, broad, distinct, and sharply multigranular. The intercos- 

 tal spaces show synapticulse, and are distinct. The calice is elliptical 

 in outline, and rather deep ; the margin is densely reticulate and 

 stout ; and the septa, barely exsert, are thin, long, and do not project 

 much from the margin. There are twelve nearly equal septa (1 & 

 2) ; and the tertiaries are not so well developed as those of the fourth 

 cycle. All these last are rather spiny on their internal margins ; and 

 their approach and contact with each other is very slight and low 

 down. There are four perfect cycles, and in one or two systems an 

 order of the fifth. The columella is deeply seated, is well separate 



