38 



PEOTOZOA— RHIZOPODA 



PHYLUM I 



Subfamily C. Hauerininae Brady. 



First-formed part of test Cornuspira-like, later chambers spiral or otherwise 

 arranged, apertures single. 



Ophthalmidium, Kiibler. Early chambers like Cornuspira, later ones two 

 or more to a convolution. Liassic to Recent. 



Hauerina d'Orbigny. Early chambers Milioline, later ones planospiral with 

 two or more chambers to a convolution. Cretaceous to Recent. 



Subfamily D. Miliolinae Brady. 



Test at first spiral, then each whorl divided typically into two chambers, later 

 chambers more numerous in the whorl or uniserial. 



Miliola Lam. (Figs. 33, 34). Chambers disposed in coil -shaped loops 

 about a few spirally wound primordial chambers. Each chamber in the 



A Jl 



Fig. 33. 



A, Bilondina inornnta d'Orb. From tlie Miocene Tegel ; Baden, near Vienna. B, Trilnculina gUilm d'Orb. 

 Oligocene sand from Astrupp. C, Spirnloculinn hadetisii d'Orb. Miocene Tegel ; Baden, near Vienna. D, Quin- 

 queloruUna auxoruw d'Orb. Eocene (Calcaire Grossier) ; Grignon, near Paris. 



adult forms a half coil. Terminal pseudopodial aperture either curving 

 in the form of a crescent about a tooth-like projection, or branching den- 

 dritically (Lacazina). Forms having all the segments disposed in a single 

 plane, and all externally visible, are grouped together in the genus Spirolocu- 

 lina d'Orbigny ; with all the segments completely enveloping one another, 

 Biloculina d'Orb. ; segments disposed in three or in five diiTerent planes, 



Miliolina Will. ( = Trilocu- 



• = =^ Una and Quinqueloculina 



d'Orb.). The great variety 



and profusion of these 



genera combine to 



them some of the 



important of the 



building Foraminifera. 



Massive beds of Eocene 



limestone (Paris basin, 



Pyrenees) are made up of 



Miliola remains ; at the 



present day calcareous 



deposits are being formed 



by Biloculina in the North Sea west of the coast of Norway. Miliola first 



makes its appearance in the Trias, and attains its maximum development 



in the Tertiary and Recent periods. 



Fio. 34. 



A, Longitudinal section of 

 Biloculina inornata d'Orb. 

 (enlarged). B, Transverse 

 section of Quinqueloculina 

 saxorum d'Orb. (enlarged). 



make 

 most 

 rock- 



FiG. 3S. 



Fabularia dis- 

 colithcs Defr. 

 Eocene (Calcairo 

 Grossier); Paris. 



Fio. 36. 



Vertehralina wm- 

 cnmata d'Orb. 

 Recent ; Mi'di- 

 terranean. 



