316 FORAMINIFERA 



Porospira Ehrenberg, 1. c, p. 75 (genotype, by designation, Porospira 



comes Ehrenberg). 

 RoHulina (part) of authors. 

 Rotaiia (part) of authors. 

 Di.Hcorbina (part) of authors. 

 Planorbulina (part) of authors. 

 Tyuncatulina (part) of authors. 



Test in the young, trochoid, in the adult often nearly involute 

 on the dorsal as well as on the ventral side, the chambers added 

 nearly in a planispiral manner, the inner coils of the dorsal side 

 often appearing as a central raised boss; wall calcareous, per- 

 forate; aperture in the young on the ventral side, in the adult 

 becoming peripheral at the base of the last-formed chamber in 

 the median line, sometimes with a boss of clear material over 

 the umbilical region. 



Lower Cretaceous to Recent. 



EXPLANATION OF PLATE 50 

 Anomalinidae, Planorbulinidae 



Fig. 



1. Anomalinella rostrata (H. B. Brady). X 35. (After type figure). 



2. Cibicides reftdgens Montfort. X 20. (After H. B. Brady). 



3. Cibicides lobatuhis (Walker and Jacob). X 40. (After H. B. 



Brady). 



4. Cyclocibicides vcrmicnlatns (d'Orbigny). X 20. (After H. B. 



Brady). 

 5-7. CibickleUa variabilis (d'Orbigny). Fig. 5 (After type figure). 

 Figs. 6, 7 (After Sidebottom). X 16. 

 8. Webbina rugosa d'Orbigny. (After type figure). 

 9, 10. Planorbulina mediterranensis d'Orbigny. Fig. 9 (After type fig- 

 ure). Fig. 10 (After H. B. Brady), Dorsal side. X 28. 



11. Planorbulinella larvata (Parker and Jones).' X 10. (After type 



figure), a, dorsal view; b, peripheral view. 



12. PlanorbnUnoides retinactdaia (Parker and Jones). X 10. (After 



type figure). 

 (Except where noted, a, dorsal view; b, ventral view; c, peripheral 

 view). 



