214 » eASTEBOPODA. 



Scala unclosa, var., J. de C. Sowerby, 1837. 



Scalaria undosa, var. „ r, „ x 



Trans. Geol. Soc. 1837, ser. 2, vol. v. pi. viii. fig. 18, p. 136. (WethereU CoU.) 



Horizon and Localities. 



Lower Eocene.— io«(^o?s Clay, llampstead Well ; Portsmouth ; Highgate 

 Wood Tunnel ; Potter's Bar. 



tScala undosa) var. conferta, Edwards (MS.). 



Clathroscala undosa, var. conferta. 

 E. de Boury (MS.). 



Horizon and Locality. 



Upper Eocene. — Barton Beds. Barton. 



Scala undosa, var. laevigata, Edwards (MS.). 



Clathroscala undosa, var. Iceciyata. 

 E. de Boury (MS.). 



Horizon and Locality. 



Upper Eocene. — Barton Beds. Barton. 



Scala Woodward! (H.), E. de Boury, 1886. 



Crisposeala Woodioardi. 

 Mon. ScalidiB, 1886, p. 39. 



Horizon and Locality. 



Upper Eocene. — Barton Beds. High Clifil 



Scala, n. sp., E. de Boury (MS.). 



Acrilla, n. sp. 



E. de Boury (MS.). 



Horizon and Locality. 



Middle Eocene. — Bracklesham Beds. Brooli. 



Genus ACIRSA, 0. A. L. Morch, 1857. 

 H. Rink's " Gronland," 1857, vol. 2. Appendix no. 4, p. 77. 



Acirsa tessellata, Edwards (MS.). 



Acirsa tessellata. 

 E. de Boury (MS.). 



Horizon and Localities. 



Oligocene. — Headon Beds. Colwell Bay ; Roydon. 



Genus FORATISCALA, E. de Boury, 1887. 

 £;tudes sous genres Scalidae, 1887, p. 28. 



foratiscala? cymsea, Edwards (MS.). 



Foratiscala (?) ci/mcea. 

 E. de Boury (MS.). 



Horizon and Localities. 

 Lower Eocene. — Lo7idon Clmj. Muswell Hill ; Hampstead ; Potter's Bar. 



