112 FORAMINIFERA 



Genus LITUOLA Lamarck, 1804 



Plate 10, figures 16-18 

 Genotype, by designation, Lituola nautiloidea Lamarck 

 Lituola Lamarck, Ann. Mus., voL 5, 1804, p. 243. 



Test in the early stages planispiral, the later portion typically 

 uncoiled and straight; wall arenaceous with much cement, the 

 interior labyrinthic; aperture in the earliest stages simple, at 

 the base of the apertural face, later, even before uncoiling, be- 

 coming multiple and in the face itself, in the adult multiple and 

 in the terminal face. 



Carboniferous to Recent. Living specimens rare, in fairly 

 warm waters. 



Genus PSEUDOCYCLAMMINA Yabe and Hanzawa, 1926 



Plate 10, figures 21-23 

 Genoholotype, Cyclammina lituiis Yokoyama 



Pseudocyclanmiina Yabe and Hanzawa, Sci. Rep. Tohoku Imp. Univ., 



ser. 2, (Geol.), vol. 9,^ 1926, p. 10. 

 Cyclammina Yokoyama, in Naumann and Neumayr, Denkschr. Akad. 



Wiss. Wien, vol. 57, 1890, p. 26 (not Cyclammina H. B. Brady). 



Test free, early chambers planispiral and completely involute, 

 later chambers uncoiling into a rectilinear series; wall thick, 

 arenaceous with much cement, the peripheral portion labyrin- 

 thic; aperture in the adult consisting of numerous rounded pores 

 scattered over the apertural face. 



Cretaceous. Japan. 



This represents an uncoiled form derived from a Cyclammina- 

 like ancestry. 



This family includes those arenaceous forms which are plan- 

 ispiral at least in their earlier stages. As end forms, there are 

 developed partially uncoiled chambers, some of them large and 

 with labyrinthic chambers. Most of these reached their highest 

 development in the Cretaceous. Under the name Endothyra 

 have been included in the past many forms which it seems 

 should be placed elsewhere. From such forms as Endothyra 

 have probably been developed the family of the Fusulinidae. 



