110 FORAMINIFERA 



developing low broad chambers in an inverted V-shape, the 

 outer margin convex or broadly angled ; the microspheric form 

 of the test broad, fan-shaped, the megalospheric form more 

 elongate and narrow ; wall arenaceous, of coarse fragments with 

 a large amount of fine material and cement; aperture in the 

 adult terminal, elliptical. 

 Lower Cretaceous. Texas. 



Genus HAPLOPHRAGMIUM Reuss, 1860 



Plate 10, figures 12, 13 

 Genotype, by designation, Spirolina aequalis Roemer 



Haplophragmium Reuss, Sitz. Akad. Wiss. Wien, vol. 40, 1860, p. 218. 

 Spirolina Roemer, Verst. Norddeutsch. Kreide, 1840-41, p. 98 (not 

 Spirolina Lamarck, 1804). 



Test with the early chambers close coiled, the later ones in 

 a rectilinear series, simple; wall arenaceous with a chitinous 

 lining; aperture in the young at the base of the apertural face, 

 becoming terminal and multiple in the uncoiled portion. 



Cretaceous to Recent. Rare in the present ocean. 



Subfamily 2. Lituolinae 

 Test composed of labyrinthic chambers 



Genus CYCLAMMINA H. B. Brady, 1876 



Plate 10, figures 14, 15 

 Genoholotype, Cyclammina cancellata H. B. Brady 



Cijclammina H. B. Brady, in NoRMAN, Proc. Roy. Soc, vol. 25, 1876, 



p. 214. 

 Lituola (part) of authors. 

 TrochaTTimina (part) of authors. 



Test free, planispiral, composed of numerous chambers in a 

 close coiled nautiloid series, usually partially or wholly involute ; 

 wall thick, of fine arenaceous material with a large proportion 

 of reddish-brown cement, exterior smooth, interior with a 

 secondary labyrinthic structure especially on the peripheral por- 

 tion of each chamber, early chambers often completely filled by 

 this secondary growth ; aperture, a curved fissure at or near the 



