434 PROF. P. M. DUNCAN ON DEEP-SEA [May 16, 



Genus Agelecyathus. 



There is no epitheca; the costse are well developed, especially near 

 the calices ; the septa are more or less exsert. There are pali, a 

 columella, and no endotheca. 



Agelecyathus helen.e, sp. n. (Plate XXXIX. figs. 4-6.) 



The corallum incrusts ; and the corallites, united by a common 

 base, are wide apart and short. The calices are elliptical or round, 

 open and moderately deep. The columella is small, papillose, and 

 deeply seated ; the septa are not crowded, but are stout, granular, and 

 unequal. The primaries and some secondaries are exsert. The pali 

 are long, thin, papillose, and are placed before the secondaries and 

 the tertiaries. The costse are flat, unequal, extend to the base, and 

 are granular. 



Diameter of calice y 2 ^ inch. 



Locality. On an Ostrea from St. Helena. 



The variation of the size and shape of the pali and septa on the 

 same corallum is interesting. In some they are both broad and 

 sharply granular laterally. 



Var. minor. 



A smaller series of corallites, and with all the specific attributes, 

 is on the under valve of the same Ostrea. 



Agelecyathus persicus, sp. n. (Plate XXXIX. figs. 1-3.) 



The corallites are united by stolqniferous expansions ; and some 

 are distant, whilst others are close. The corallites are cylindrical, 

 slightly narrower at the base, and tumid below the calice. The 

 costse are distinct, wide, granular, unequal, and flat. The septa are 

 unequal, the primaries being the shortest, and those of the higher 

 cycle much smaller : but in some calices the septa are alternately 

 large and small. Some calices have very wide septa, largely granular 

 at the sides ; others have them thinner; and all are short. There 

 are three cycles, or some septa of the fourth may be present. The 

 columella is small and papillose, and deep in the rather deep fossa. 

 The pali are small, and either thick or papillose. They are placed 

 before the tertiaries, and sometimes before the secondaries. 



The variability of the pali, and size of the septa, and the septal 

 number is very remarkable in the same corallum. 



Expanse of corallum 1 to 2 square inches. Height of corallites 

 2^ to TO inch- Breadth of calice -y^- to T \j- inch. 



Locality. Dredged up out of Persian Gulf. 



Subfam. TurbinoliacejE. 



Javania, gen. nov. 



The corallum is simple, tall, compressed at the calice, and adheres 

 by a broad base. There is a complete epitheca, dense inferiorly, and 

 pellicular superiorly The larger septa are very exsert; and the ter- 

 tiaries have costa? much broader than they are. The costce of the 



