212 Christmas Island. 



The distribution of the fossil specimens on Christmas Island 

 is as follows : — 



No. 53. From top of sea cliff on the east coast. 



No. 306. First inland cliff above West AVhite Beach ; alt. 



260 feet. 

 No. 100. From a limestone breccia on the first inland cliff at 



the height of 250 feet. 



Cceloria andrewsi, sp.n. 



Diagnosis. — Corallum, form unknown, but massive ; the species 

 is represented by a slab 80 mm. high, 55 mm. wide, and 20 mm. 

 thick. Corallites in verj' short series and mostly isolated. The 

 longest series is 7 mm. long, and includes three calicinal centres. 

 The single, circumscribed corals occur in regular rows. Walls 

 thick. Columella .of stout trabeculse, and for the genus fau'ly well 

 developed. Septa stout ; one cycle, in young corallites ; two 

 incomplete cycles in matiu-e corallites. 



Distribution. — Eepresented in the collection by one specimen 

 (No. 175), from the first inland cliff on the north coast ; approximate 

 altitude 90 feet. 



Figure. — PI. XIX, Fig. 1. Part of a transverse section, X 2 dia. 



Affinities. — The nearest ally of this species is the Mceandrina 

 delicatula, Ortm.,^ from Samoa, in which the valleys are from 

 5 to 12mm. in length; the septa occur in three cycles, and the 

 columella is represented only by a trace. Owing to the shortness 

 of the calicinal series the species belongs to the section of Cceloria, 

 for which Edwards & Haime once founded the genus Astroria. 

 This species is also allied to Astroria esperi, Ed. & H.,^ which, 

 however, has three incomplete cycles of septa, and calicinal valleys 

 3 centimetres long. 



Mseandrina equisepta, sp.n. 



Diagnosis. — Corallum massive. Calicinal series 5 mm. wide and 

 fairly long (many of them being 3 cm. long) ; while there are 

 many independent calices. Many of the calicinal series are 

 straight, and others are bent into V- shape. Septa subequal, and 

 about thirteen in number in 1 cm. ; small secondaiy septa occur at 

 intervals. Columella usually a little under 1 mm. in width, but 

 varying from "5 to 1 '5 mm. 



Figure. — PI. XIX, Fig. 2. Part of a transverse section, X 2 dia. 



' Ortmana: op. cit., p. 171, pi. vi, fig. 6. 



' Edwards & Haime, Mem. Astr., pt. ii : Aun. Sci. nat., Zool., ser. iii, 

 vol. xi (1849), p. 298. 



