part 2] rugose corals from the burindi series. 165 



level. In proportion to its size, Cionodendron has an even larger 

 columella than Amygdalophyllum ; but the entire corallite of the 

 former is smaller than the columella of the latter. 



Locality. 



The specimens of Amygdalophyllum were obtained at Babbin- 

 boon from the mudstones of the Burindi Series. They were 

 collected by Mrs. Scott and one of us (W. N. B.). Associated 

 with them was ZapJirentis sumphuens Etheridge fil., 1 which very 

 closely resembled AmygdalopJiyllum etheridgei in size and external 

 form. 



The type-material is in the collection of the New South Wales 

 Geological Survey ; but some sections cut from these have been 

 placed in the British Museum (Natural History). 2 



IV. Cionodendron, gen. nov. 



Composite genus, allied to and derived from. LitJwstrotion. In 

 habit, form, and in general structure it is identical with the parent 

 genus ; but it is distinguished from Litliostrotion by the ex- 

 cessively large and well-formed columella, similar to that found in 

 AmygdalopJiyllum. In Cionodendron, the columella occupies 

 more than one-fourth of the diameter of the corallite. 



Genotype. Cionodendron columen. This species is the only one 

 at present known. 



Cionodendron colttmen, gen. et sp. nov. (PI. VIII, figs. 4 & 5 ; 

 PL IX, figs. 4 & 7.) 



1895. Diphyphyllum. Ann. Rep. Dept. Mines N.S.W. p. 188. 

 1921. Diphyphyllum Benson. Rec. Geol. Surv. N.S.W. vol. x, p. 32. 



Morphology. 



Habit of growth and external form. — The corallum is 

 compound and fasciculate ; the corallites are cylindrical, straight, 

 closely grouped, and frequently touching. Diameters 5 to 6 mm. 



The calice (if we judge from the sections, as no weathered 

 calices are shown in the specimen) is probably deep and thin- 

 walled, with a ■prominent boss rising from the centre. 



Internal structure [ephebic stage]. — Septa. About 

 26 septa are present in each cycle. They are united to the epitheca 

 throughout, and the major penetrate the columella. The minor 

 septa attain approximately half the length of the major, and thus 

 extend well beyond the theca. 



The columella is nearly circular in section, and attains a 

 diameter of 1*5 mm. (or even a little more) : that is, a fourth to a 



1 Mem. Geol. Surv. N.S.W., Paleontology, No. 5, pt. 1, p. 16 & pi. xi, 

 figs. 4-6. 



- R 22072 & R 21997. R 22072 was cut from the kolotype now in Sydney. 



Q. J. G. S. No. 314. n 



