18 LAMELLIBKANCHIATA. 



Area planicosta, Deshayes, 1824. 



Arcaplanicosta. 



Coq. Foss. Paris, 1824, vol. i. pi. xxxii. figs. 1, 2, p. 204. 



Byssoarca duplicata, 



Dixon's ' Sussex,' 1850, pi. iii. fig. 22, p. 93. (Dixon Coll.) 



Area planicosta. 



Mon. Pal. Soc. 1864, pi. xiv. figs. 2', 2", p. 89. (F. E. Edwards CoU.) 



Horizons and Localities. 



Upper Eocene. — Barton Beds. Barton. 



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

 Huntingbridge ; Stubbington ; Brook ; Whiteclifl' Bay. 



Area sublsevis, Edwards (MS.). 



Horizon and Locality. 



Middle Eocene. — Bracklesham Beds. Bracklesham Bay. 



Area tegulata (Edwards, MS.), S. V. Wood, 1864. 



Area tegulata. 



Mon. Pal. Soc. 1864, pi. xv. figs. 10», 10', p. 90. (F. E. Edwards Coll.) 



Horizon and Locality. 

 Middle Eocene. — Bracklesham Beds. Bracklesham Bay. 



Area tessellata (Fisher, MS.), 8. V. Wood, 1864. 



Area tessellata. 



Mon. Pal. Soc. 1864, pi. xv. figs. 14», 14', p. 91. (F. E. Edwards CoU.) 



Horizon and Locality. 



Middle Eocene. — Brackleshatn Beds. Brook. 



Area tumeseens (Edwards, MS.), S. V. Wood, 1864. 



A7'ca tiimescens. 



Mon. Pal. Soc. 1864, pi. xv. figs. 1», 1', p. 92. (F. E. Edwards Coll.) 



Horizons and Localities. 



Middle Eocene. — Bracklesham Beds. Brook. 



Lower Eocene. — London Clay. Clarendon ; Alum Bay (no. 4 Bed). 



Area Websteri (Forbes, MS.), Morris, 1856. 



Area Websteri. 



Forbes's ' Isle of Wight,' Mem. Geol. Surv. 18,56, pi. iii. fig. 8, p. 150. 

 Mon. Pal. Soc. 1864, pi. xv. figs, ll^-ll'', p. 92. (F. E. Edwards Coll.) 



Horizon and Localities. 



Oligocene. — Bembridtje Beds. Hempstead ; St. Helens. 



Genus CUCULUEA, Lamarck, 1801. 

 Syst. Anim. sans Vert. 1801, p. 116. 



Cueullsea decussata, Parkinson, 1811. 



Cucullera crassatina. 

 Ann. Mas. ISOo, vol. 6. p. 338. 

 Morris's Cat. Brit. Foss. 1843, p. 84. 



CxuMllcea decussata. 

 Organic Remain.'?, 1811, vol. iii. pi. xiii. fig. 1, p. 171. 



