THE FAMILY MILIOLID^ 79 



certain species, increase in number as the shell 

 developes. 



The relationship of the foregoing group to the 

 AlveolinincB is easily recognised when we conceive 

 the plan on which the test is formed. Like 0//>/- 

 Giilina it is spiral, but instead of being compressed 

 laterally, as in that genus, the shell is often 

 enormously elongated on an axis passing through the 

 umbilical centres. 



The last sub-family of the Keramospho'riiue com- 

 pletes the series, in that it presents a modification of 

 the Orhitolite^ type by the fact of its having the 

 chamberlets arranged not in flat annuli, but in 

 a sph^ero-concentric manner. 



Sub-famili/ 1. NuBECULAEiiNyE. 



This group is distinguished by the irregular a- 

 symmetrical form of the test, which is free or, perhaps 

 more often, adherent ; with a variable aperture or 

 apertures, often rimmed in Nubecularia or otherwise 

 thickened with extra shell growth. 



Genus Squaniuliiia, Schultze. 



Test, a single inflated chamber, with aperture on 

 the convex surface. Becenf. 



Example. — S. he vis, Schultze, Organismus pol}-- 

 thal., 1854, p. 56, pi. vi. figs. 16, 17. 



Found by Schultze adhering to the surface of 

 marine alg£e from Ancona. Longest diameter of test, 

 '08 mm. 



