38 



57- Bathyaciis stephana Alcock. 



Batliyactis stephana Alcock. Journal Asiatic Soc. Bengal, Vol. LXII, pt. 2, 1893, p. 149, pi. 

 V, figs. 12, iza, and Investigator Deep Sea Madreporaria, p. 28, pi. III, fig. 5, ^a. 



Stat. 88. o°34'.6N., H9°8'.5E. 1301 m. 1 Ex. 



3 small fragments from 49a may also possibly belong to this species: their texture is 

 much stronger and denser, but this may be the result of shallow-water conditions. 

 Distribution. Bay of Bengal, Macassar Strait. 



58. Bathyaciis Sibogee n. sp. 



Stat. 95.? 5°43'.5N., 119 40' E. 522 m. 1 Ex. 



Stat. 159. o°S9'.i S., i29°48'.8E. 411 m. 1 Ex. 



Stat. 175. 2°37'.7S., I30°33'.4E. 1914 m. 1 Ex. 



Stat. 297. io°39' S., i23°4o' E. 520 m. 1 Ex. 



It is unnecessary 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, which also has 5 cycles of septa, it cliffers in having the basal wall 

 flat instead of deeply concave, and the septa low instead of very tall. 



Diameter of largest specimen 57 millim. 



59. Bathyactis palifera n. sp. Plate V. Fig. 34, 34a. 



Stat. 98. 6° 9' N., 120 21' E. 350 m. 2 Ex. 

 Stat. 153. o°3'.8N., i30°24'.3E. 141 m. 3 Ex. 



Corallum discoidal : basal wall nearly flat, with fine, low, but distinct, discretely-granular 

 radiating costae. 



Septa in six systems and five complete cycles, those of the first cycle being free, but 

 those of the other cvcles combinirigf to form six beautifullv-regfular deltas. In the first three 

 cycles the septa rise up as high crest-like lobes, which are traversed by elegant parallel serru- 

 late strise : those of the first cycle are considerably the tallest, those of the third cycle consi- 

 derably the lowest. 



There are six large, foliaceous, upright, isolated pali — one opposite to each of the 

 second cycle where these are joined by the septa of the third cycle. 



The columella, which is small and umbilicate, is formeel by the union of the 12 septa 

 of the first two cycles. 



The septa are echinulate, but besides this there are five (ir six concentric series of synapti- 

 culae, which are most distinct in the neighbourhood of the 1 2 large septa of the first two cycles. 



Diameter of corallum 17 millim. 



Greatest height of corallum 6 „ 



Only dead coralla were dredged. 



