162 FORAMINIFERA 



aperture in the adult elongate, narrow, at the ends of the 

 peripheral portions. 



Recent. Atlantic. 



As noted by Heron-Allen and Earland, this is to be considered 

 a specialized form and representing an end form in the 

 Cormtspira-like series. 



Genus VIDALINA Schlumberger, 1899 



Plate 20, figures 3, 4; plate 21, figure 2 



Genoholotype, Vidalina hispanica Schlumberger 

 Vidalina Schlumberger, Bull. Soc Geol. France, ser. 3, vol. 27, 1899, 



p. 459. 

 Test similar to Cornuspira, but completely involute, the 

 umbonal region thickened. 

 Cretaceous. 



EXPLANATION OF PLATE 20 



Ophthalmidiidae, Fischerinidae 

 Fig. 



1. Cornuspira planorbis Schultze. X 65. (After type figure). 



2. Cornuspira involvens Reuss. X 20. (After H. B. Brady), a, 



side view; 6, peripheral view. 

 3, 4. Vidalina hispanica Schlumberger. (After type figures). Fig. 3, 

 Horizontal section. X 30. Fig. 4, Vertical section. X 55. 



5. Nodobacularia tibia (Jones and Parker). (After type figure). 



6. Ophthalmidium inconstans H. B. Brady. X 35. (After H. B. 



Brady). 



7. Spiropthahnidium acutimargo (H.B.Brady). X 35. (After type 



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



8. Discospirinia fenuissima (Carpenter). X 12. (After H. B. Brady). 



a, from flat side; b, from periphery. 

 9, 10. Planispirina communis Seguenza. X 12. Fig. 9, (After type 

 figure). Fig. 10, (After H. B. Brady), Section. 



11. Renulina opercularia Lamarck. (After type figure). 



12. Vertebralina striata d'Orbigny. (After d'Orbigny's Model). 



13. Nubecularia lucifuga Defrance. X 12. (After H. B. Brady). 



a, from above; b, from below. 



14. Squamulina laevis Schultze. X 50. (After type figure). 



15. Calcituba polymorpha Roboz. (After type figure). 



16. FischeHna rhodiensis Terquem. X 28. (After type figure), a, 



dorsal view; b, ventral view; c, apertural view. 

 17, 18. Fischerina helix Heron-Allen and Earland. X 65. (After type 

 figures), a, dorsal view; b, apei'tural view. Fig. 18, From 

 below, by transmitted light. 



