FAMILY 8. LITUOLIDAE 107 



Genus ENDOTHYRA Phillips, 1846 

 Plate 10, figures 6, 7 



Genoholotype, Endothyra bowmani Phillips 



Endothyra Phillips, Rept. Proc. Geol. Poly. Soc. West Riding York- 

 shire, 1844-45 (1846), p. 277. 



Involutina (part) of authors. 



Nonionina Eichwald, Lethaea Rossica, vol. 1, 1860, p. 350 (not Nonionina 

 d'Orbigny, 1826). 



Test free, close coiled, often completely involute; chambers 

 numerous, distinct, simple ; wall arenaceous usually with a large 

 amount of cement, the exterior smoothly finished; wall often 

 double; aperture simple, typically at the base of the apertural 

 face but occasionally above the base. 



Carboniferous to Triassic. In the Pennsylvanian often very 

 abundant. 



Genus CRIBROSTOMOIDES Cushman, 1910 



Plate 10, figure 8 



Genoholotype, Cribrostomoides bradyi Cushman 

 Cribrosto7noides CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 108. 

 Haplophragmium (part) H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 307. 



Test free, planispiral, composed of numerous chambers in 

 several coils, the chambers increasing gradually in size as added ; 

 wall arenaceous with much cement, light brown in color; aper- 

 ture in young specimens, a simple elongate slit at the base of 

 the apertural face, in later chambers subdivided by tooth-like 

 processes, in the adult with a linear series of distinct rounded 

 openings. 



Recent. Widely distributed, in cool or deep water, but also 

 common at some localities in fairly shallow warm water. 



Genus AMMOBACULITES Cushman, 1910 

 Plate 10, figures 9-11 



Genotype, by designation, Spirolina agglutinans d'Orbigny 



Ammobaculites Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 114. 

 Spirolina (part) d'Orbigny, For. Foss. Bass. Tert. Vienne, 1846, p. 137. 

 Haplophragmium (part) of authors. 



Test free, the early chambers close coiled, later ones uncoiling 



