BY W. X. BEXSOX, W. 8. DUN, AXD W. R BROWXE. 341 



The taljulae are somewhat irregularly spaced, being frequently about a milli- 

 meti'e apart, and often closer together. They have a general upward arching, but 

 this is not marked. Sometimes they are continuous across several septa, but at 

 jther times are confined to one interseptal space. There is no apparent stereo - 

 plasmic thickening on the tabulae and very little if any on the dissepiments. 



This form appears to be closely related to Koninckophyllum inopinatum Eth. 

 til., which occurs in the- Carboniferous limestone of Lion Creek, Stanwell, near 

 Rockhampton.* It differs from this form, however, in that the primary septa 

 reach and unite with the columella, while those of Koninckophyllum do not do so, 

 and that the septa of the second cycle are two-thirds or three-quarters of the 

 lengfh of the priraary septa, instead of being only one-half as in the case of 

 Koninckophyllum. In some respects also the form appears to be allied to Cya- 

 thaxonia, as pointed out in a private communication from Dr. Stanley Smith. 

 Though the corallite is simple, its structure resembles that of such forms of Litho- 

 strotioti of much smaller diameter, as L. stanveUense Eth. fil., which Dr. Smith has 

 recognised in the Burindi Beds at Hall's Creek, soutli of Bingara.** It is interest- 

 ing to note that his remark that the stoutness of the columella, and the tendency 

 of the septa to end in the area of dissepiments, and not quite reach the epitheca, 

 features which are present in the form described here, are features which dis- 

 tinguish the Australian forms of Lithostrotion from the British types. On 

 account of the shape of the transverse section of the columella, we have adopted 

 for this genus the name Amygdalophyllum, suggested to us by Professor David, 

 F.R.S. The species, the only one yet known, we dedicate to the late Robert 

 Etlieridge, Junr., in appreciation of his fifty years of work on the Geology and 

 Palaeontology of Australia. This form was collected in the south-east of Babbin- 

 boon by Mrs. Scott and Benson. The type material will be placed in the collec- 

 tion of the Geological Survey. 



DiPHVPHYLLUJt SP. IXDET. 



Indefinite sjiecimens provisionally referred to this genus were obtained 

 by Cullen from the Parish of Moorowarra. These are recorded as numbers 4510 

 and 4515 in the collection of the Geological Survey. This is perhaps a Lithostro- 

 lioii ((■/. Smith, 1920, loc.cit.). 



TrYPLASMA ? SP. IXDET. 



A very indefinite fragment doubtfully referred to this genus is found on 

 specimen 4419 in +he collection of the Geological Survey, and was obtained by 

 Cullen in the Parish of Moorow-arra. 



MiCHELINIA TENUISEPTA (Phillips). 



Cahtmnpora tenuisepta, Phillips, Illus. Geol. York., ii., 1836, p. 201, t. 2, f. 3. 

 Michelinia tenuisepta, De Koninck, Anim. Foss. Terr. Carb. Belg., p. 31, t. c, f. 3; 



R. Etheridge, Junr., Mem. Geol. Surv. N.S.W., Pal. No. 5, pt. 1, 1891 



p. 28, t. 4, f. 1. 

 Tlie form was found in New South Wales first at Carroll, and compared 

 dubiously by Mr. Etheridge to the above species. Later and more perfect speci- 

 mens have confirmed the determination. Our specimen was collected by jMrs. 

 Scott in the south-east of Babbinboon. 



•R. Etheridge, Junr., Geol. Sxirv. Queensland, BuU. 12, 1900, T)p.20-21, t.l, f.2 ; t.2, 

 f.9, 10. AccordinET to a private communication from Dr. S. Smith, Etheridge's Konincko- 

 phyllum is certainly not Thompson's l\oninckof>hvlliiiii. 



*'S. Smith, On AphropvUum hallense, gen. et sp. nov. and Lithostrotion from the 

 Neighbourhood of Bingara. N.S.W. Proc. Roy. Soc. N.S.W., liv., 1920. 



