822 AUSTRALIAN FORAMINIFERA, I., 



two or four; suture-lines only faintly marked on the shell-surface; 

 surface smooth and shiny; shape of test elongate-ovate. The 

 shell is composed of carbonate of lime and an organic material 

 which is left after treatment with acid. In minute structure, 

 colour and composition the test is like that of Cristellaria; but 

 the arrangement of the chambers recalls that of Milioliyia alveo- 

 liniformis, though it is more variable. Longitudinal sections 

 show that the earlier chambers sometimes have parts of their 

 walls resorbed when enclosed in larger ones, so that small aper- 

 tures open communication between them (see fig. 11). A trans- 

 verse section (see figs. 12a and 126) shows a close resemblance to 

 that of Miliolina agghitinans. 



The shell is made up of fibrous prisms of calcite placed at right 

 angles to the external, surface, and is of much greater thickness 

 than is usual in the family, the thickness of shell recalling 

 Nuhecularia. It seems that where the walls of two chambers 

 adjoin they coalesce, greatly increasing the thickness at that 

 point (see fig. 10). 



Fig. 13 shows a specimen allied to LinguUna carinata, Hantken. 

 This is the largest foraminifer obtained in the Byron Bay 

 material, the length being equal to that of Polymovphina alveo- 

 li formis. It is a much more swollen variety than the typical 

 L.' carinata, and seems to have affinities with the genus Gonaio- 

 spJuera of Guppy. The final chamber is often broken off", leaving 

 a ridge (r. fig.l3) as in Go7iotospli(era j^rolata, Guppy.^ 



Of the seventy-seven species identified in the Byron Bay 

 material twenty-four were found by Mr. Whitelegge to be present 

 in Port Jackson, and are enumerated in his List. 



3. Foraminifera in beach sand from Lord Hoive Island. 



This material was given to me by Mr. C. Hediey, F.L.S., of 

 the Australian Museum. It was very fragmentary: and con- 

 tained only a few forms, here enumerated. 



* See Geol. Mag. for June, 1904. 



