90 THE FOEAMINIFEEA 



is encrusted with sand, which gives it a rough 

 appearance, as its name imphes. It was first 

 described as occurring in the Miocene of Kostej, in 

 the Banat, and it has since been found in the 

 Folkestone-Gault. At the present day it occurs in 

 shallow-water dredgings in the tropics. Lower 

 Lias to Becent. (Plate 3, figs. A, a.) 



8. planulata, Lamarck sp. (Miliolites jdaimlata), 

 'Ann. Mus.' vol. v. 1805, p. 352, No. 4; 1822, 

 ' Anim. sans Yert.' vol. vii. p. 613, No. 4. 



The chief features of this form are a simple 

 complanate and smooth-textured shell, wdth the 

 surface of the chambers not thickened at the suture 

 lines, as in some species, such as H. Ihnhata and 

 8. impressa. 



8. planulata is commonest in shallow water, and 

 as a fossil it seems to range from the Cai-ho-Fennicm 

 onward, if its occurrence in Tasmanian rocks can be 

 verified. (Plate 3, figs. B, h.) 



Genus MilioUna, Williamson. 



Chambers inequilateral, coiled round the long 

 axis of the shell, so that usually three or five are 

 visible externally, but sometimes as many as eight. 

 Aperture large and alternately occupying opposite 

 extremities of the shell, generally furnished with a 

 valve-like projection or tooth. 



This important genus is usually well represented 

 in shallow-water sands around the shore lines and 

 coasts both of temperate and tropical countries, and 

 the genus w^as one of the first to be noticed by the 



