30 liAiTELUBRANCHIATA. 



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



Unio tumescens. 

 Men. Pal. See. 1864, pi. xx. figs. 17% 17^ p. 136. (F. E. Edwards Coll.) 



Horizon and Locality. 



Oligocene. — Headon Beds. Headon Hill. 



Unio Vectensis (Edwards, MS.), S. V. Wood, 1864. 

 Unio Vectensis. 

 Mon. Pal. See. 1864, pi. xx. fig. 16, p. 136. (F. E. Edwards Coll.) 



Horizons and Localities. 



Oligocene. — Hempstead Beds. Hempstead. — Headon Beds. Headon Hill. 



Family CRASSATELLID^, Gray. 



Genua CRASSATELLA, Lamarck, 1799. 

 M^m. Soc. Hist. Xat. Paris, 1799, p. 86, no. 95. 



Crassatella Bartonensis (Edwards, MS.), S. V. Wood, 1871. 



Crassatella Bartonensis. 



Mon. Pal. Soc. 1871, pi. xxiv. figs. 7", 7% p. 163. (F. E. Edwards Coll.) 

 Horizon and Locality. 



Upper Eocene. — Barton Beds. Barton. 



Crassatella Bronnii (?) (Marian, MS.), Deshayes, 1860. 

 Crassatella Bronnii. 

 Sandberger, Unters. Mainz. Tertiar. 1853, p. 9. 

 Desc. Anim. sans Vert. 1860, vol. i. pi. xix. figs. 12-14; pi. xx.-figs. 22-24, 



p. 750. 

 Mon. Pal. Soc. 1871, pi. xxiv. figs. 2«-2'=, p. 163. (F. E. Ed\*ards Coll.) 



Horizon and Localities. 



Upper Eocene. — Barton Beds. Barton ; High Cliff". 



Crassatella Bronnii (?), var. sequalis (Edwards, MS.), S. V. Wood, 

 1871. 

 Crassatella Bronnii, var. aqiialis. 



Mon. Pal. Soc. 1871, pi. xxiv. fig. 4, p. 164. (F. E. Edwards Coll.) 

 Horizons and Localities. 



Upper Eocene. — Barton Beds. Barton. 



Middle Eocene. — Bracklesham Beds. Bracklesham Bay ; Stubbington. 



Crassatella Bronnii (?), var. tumescens (Edwards, MS.), S V. 

 Wood, 1871. 

 Crassatella Bronnii, var. tumescens. 



Mon. Pal. Soc. 1871, pi. xxiv. fig. 5, p. 164. (F. E. Edwards OoU.) 

 Horizon and Localities. 



Middle Eocene. — Brackksham Beds. Bracklesham Bay ; Stubbington. 



