108 



26. Bathyactis Sibogce n. sp. 



It is uunecessary to give a lengthened description of this species, 

 as it agrees with B. symmetrica in all respects except that (1) 

 the septa are more numerous, being in 5 complete cycles instead 

 of 4, and (2) the texture of the corallum is even more delicate. 

 It is also much larger. 



From B. stephana, wbich also has 5 cycles of septa, it differs 

 in having the basal wall flat instead of deeply concave, and the 

 septa low instead of very tall. 



Diameter of largest specimen 57 millim. 



27. Bathyactis palifera n. sp. 



Corallum discoidal : basal wall nearly flat, with fine, low, but 

 distinct, discretely-granular radiating costse. 



Septa in six systems and five complete cycles, those of the 

 first cycle being free, but those of the other cycles combining to 

 form six beautifully-regular deltas. In the first three cycles the 

 septa rise up as high crest-like lobes, which are traversed by 

 elegant parallel serrulate striae: those of the first cycle are 

 considerably the tallest, those of the third cycle considerably 

 the lowest. 



There are six large, foliaceous, upright, isolated pali — one 

 opposite to each of the septa of the second cycle where these 

 are joined by the septa of the third cycle. 



The columella, which is small and umbilicate, is formed by 

 the union of the 12 septa of the first two cycles. 



The septa are echinulate, but besides this there are five or six 

 concentric series of synapticulae, which are most distinct in the 

 neighbourhood of' the 12 large septa of the first two cycles. 



Diameter of corallum 17 millim. 



* Greatest height of corallum 6 » 



Only dead coralla were dredged. 



