38 



PEOTOZOA— EHIZOPODA 



PHYLÜM I 



an\ 



Subfamily C. Häuerininae Brady. 



First-formed part of test Cornuspii'a-like, later Chambers Spiral or otherwise 

 apertures Single. 



Ophthalmidium Kubier. Early Chambers like Cornuspira, later ones two 

 or more to a convolution, Liassic to Eecent. 



Ilauerina 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 eacli whorl divided typically into two Chambers, laier 

 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 



Fig. 33. 

 A, Biloculina inornata d'Orb. From the Miocene Tegel ; Baden, near Vienna. B, Triloculina gibha d'Orb. 

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

 qüeloculina saxorum d'Orb. Eocene (Calcaire Grossier) ; Grignon, near Paris. 



Fig. 34 



A, Longitudinal section of 

 Biloculina inornata d'Orb. 

 (enlarged). B, Transverse 

 section of Quinquelomlina 

 saxorum d'Orb. (enlarged). 



adult forms a half coil. Terminal pseudopodial aperture either curving 

 in the form of a crescent about a tooth-like protection, 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 dilferent planes, 



Miliolina AVill. ( = Trilocu- 



•= ^^ lina and Quinqueloculina 



d'Orb.). The great variety 



and profusion of these 



genera combine to make 



them some of the most 



important of the rock- 



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. 



Fig. 85. 



Fahularia dis- 

 colithes Defr. 

 Eocene (Calcaire 

 Grossier) ; Paris. 



Fig. 36. 



Vertebralina mu- 

 cronata d'Orb. 

 Recent ; Medi- 

 terranean. 



