26 lAMELLIBRANCHIATA. 



NvcuXa similis, var. trigona. 

 Mon. Pal. Soc. 1864, pi. xviu. %. W, p. 118. (F. E. Edwards CoU.) 



Horizmi and Locality. 



Upper Eocene. — Barton Beds. Barton. 



Nucula sphenoides (Edwards, MS.), S. V. Wood, 1864. 



Nucula sphenoides. 

 Mon. Pal. Soc. 1864, pi. xviii. fig. 2; pi. xix. figs. 2% 2", p. 119. (F. E. 

 Edwards Coll.) 



Horizons and Localities. 

 Oligocene. — Hempstead Beds. Hempstead. 

 Middle Eocene. — Bracklesham Beds. Brook ; Bramshaw. 



Nucula striatella, Edwards (MS.). 



Horizon and locality. 



Lower Eocene. — Thanet Sands. Heme Bay. 



HTucula subtransversa (?), Nyst, 1845. 



Nucula suhtransrersa. 



M^m. Cour. (4to) 1845, vol. xvii. p. 227 (not figured). 



Mon. Pal. Soc. 1864, pi. xix. fig. 1.3, p. 120. (F. E. Edwards Coll.) 



Horizon and Locality. 



Middle 'Eocsne.^Brdcklesham Beds. WhiteclifF Bay. 



Nucula Thanatiana (Edwards, MS.), S. V. Wood, 1864. 



Nucula Thanatiana. 



Mon. Pal. Soc. 1864, pi. xix. fig. 6, p. 121. (F. E, Edwards Coll.) 



Horizon and Locality. 



Lower Eocene. — Thanet Sands. Pegwell Bay. 



Nucula tumescens (Edwards, MS.), S. V. Wood, 1864. 



Mon. Pal. Soc. 1864, pi. xviii. figs. 1«-1', p. 121. (F. E. Edwards CoU.) 

 Horizons and Localities. 



Oligocene. — Headon Beds. Mead End. 

 Upper Eocene. — Barton Beds. Barton. 



Nucula veuusta, S. V. Wood, 1864. 



Nucula venusta. 



Mon. Pal. Soc. 1804, pi. xx. fig. 10, p. 122. (Prestwich Coll.) 

 Horizons and Localities. 



Lower Eocene. — London Clay. Clewett's Green, Basingstoke and Reading 

 Railway. — Thanet Sands. Heme Bay. 



Nucula Wetherellii, J. de C. Sowerby, 1837. 



Nucula Wetherellii. 



Trans. Geol. Soc. 1837, 2nd ser. vol. v. part 1, pi. viii. fig. 12, p. 136. 



(Wetherell Coll.) 

 Mon. Pal. Soc. 1864, pi. xix. figs. 9», 9^ p. 121. (Wetherell Coll.) 



Horizon and Localities. 



Lower Eocene. — London Clay. Highgate ; Potter's Bar ; Sudbury ; 

 Hampstead Well. 



