218 FORAMINIFERA 



Genus MONALYSIDIUM Chapman, 1900 



Plate 31, figures 5, 6 

 Genotype, by designation, Monalysidium sollasi Chapman 



Monalysidium Chapman, Journ. Linn. Soc. Zool., vol. 28, 1900, p. 3 (as a 

 subgenus of Peneroplis) . 



Test with the early chambers close coiled, later ones uncoiled 

 in a rectilinear series ; wall imperforate, smooth or with vertical 

 rows of minute tubercles; aperture circular, terminal, some- 

 times with a short neck and lip. 



Recent. 



Subfamily 2. Archaiasinae 



Test discoid, the early chambers spiral and simple, later ones 

 divided into chamberlets, later stages variously involute. 



Genus FALLOTIA H. Douville, 1902 



Plate 31, figure 7 

 Genoholotype, Fallotia jaequoti H. Douville 

 Fallotia H. Douville, Bull. Soc. Geol. France, ser. 4, vol. 2, 1902, p. 298. 



EXPLANATION OF PLATE 31 



Peneroplidae 



Fig. 



1. Peneroplis planatus (Fichtel and Moll). X 35. (After H. B. 



Brady), a, side view; b, apertural view. 



2. Dendritina arbuscida d'Orbigny. (After d'Orbigny's Model). 

 3, 4. Spirolina cylindracea Lamarck. X 40. (After H. B. Brady). 



5. Monalysidium polita Chapman. X 35. (After type figure). 



6. Monalysidium sollasi Chapman. X 35. (After type figure). 



7. Fallotia jaequoti H. Douville. X 5. (After type figure). 



8. Meandropsina vidali Schlumberger. X 3. (After type figure). 



a, portion of surface enlarged. 



9. Archaias angulatus (Fichtel and Moll). X 20. (After H. B. 



Brady), a, side view; b, peripheral view. 

 10. Archaias aduncus (Fichtel and Moll). X 12. (After H. B. 

 Brady). 

 11, 12. Praesorites mouroti H. Douville. Fig. 11, (After type figure). 

 X 5. 11, a, surface eroded, showing jiartitions. Fig. 12, 

 Equatorial section. X 18. 



