CYTHERELLA. 



3. Elliptical (broad); with pit. Cytherella Muensteri, Roemer, 1838 



Bosquet, 1852. (The published figures vary) 



4. Elliptical (broad); with pit. Cytherella nitid a, G. S. Brady, 1869 



5. Elliptical and oblong; with pit. Cytherella Beyrichi, Reuss, 1851 



Bornemann, 1855; Speyer, 1863; G. S. Brady, 1866. (The 

 published figures vary) 



6. Elliptical ; with anterior border. Cytherella ? grossefoveolata 



Giimbel, 1871 . 



7. Oblong; with pit. Cytherella punctata, G. S. Brady, 1866 



8. Oblong (broad), but tapering. Cytherella intermedia, Bornemann 



1855 ..... 



9. Oblong (broad). Cytherella corapressa,^ Miinster, 1838; and 



varieties Beyrichi and intermedia^ Jones, 1856. (The pub- 

 lished figures vary) .... 



10. Oblong. Cytherella semitalis, G. S. Brady, 1868 



11. Oblong. Cytherella ? aciculata, Roemer, 1838 



12. Oblong (narrow). Cytherella ? asperula, Reuss, 1845 . 



13. Oblong, pinched; with faint pit. Cytherella transversa, Speyer 



1863 . . . . . 



Tertiary. 

 Recent. 



Recent and 

 Tertiary. 



Trias. 

 Recent. 



Tertiary. 



Tertiary. 

 Recent. 

 Tertiary. 

 Cretaceous. 



Tertiary. 



I. Surface even. C. Surface reticulate and foveolate. 

 Outline subovate or sub-oblong ; profile cuneiform. 

 1. Oblong. Reticulate. Cytherella venusta, G. S. Brady, 1880 . Recent. 



2. Oblong. Foveolate. Cytherella cribrosa, G. S. Brady, 1880 



Recent, 



II. Surface uneven. A. Smooth. 



Suboblong. 



Cytherella cingulata, G. S. Brady, 1869 . 

 Suboblong. Cytherella crepidula, Blake, 1876 

 Oblong (broad). Cytherella Williamsoniana, Jones 1848 (=?5e; 



rata. Wills.) .... 

 Oblong. Cytherella auricularis. Bosquet, 1847 and 1854 

 Cytherella cavernosa, G. S. Brady, 1868 

 Cytherella leioptycha, Reuss, 1850 

 Cytherella Ulmensis, Giimbel, 1871 

 Oblong; with pit. Cytherella hieroglyphica, Bosquet, 1852 

 Oblong; with pit. Cytherella denticulata. Bosquet, 1854 

 10. Oblong; slightly uneven. Cytherella truncata, G. S. Brady, 1869 

 1 See note on this species in the ' Geol. Mag.,' vol. vii, 1870, p. 157. 



5. Oblong. 



6. Oblong. 



7. Oblong. 



9. 



Recent. 

 Lias. 



Cretaceous. 



Cretaceous. 



Recent. 



Cretaceous. 



Jurassic. 



Tertiary. 



Cretaceous. 



Recent. 



