PLATE X. 
Figs. 
1. Cerithium near to variculosum, Desl. I. O., Rodborough Hill. Jermyn Street 
Museum. (Page 166.) 
2. Cerithium comma, Mist. Cadomensis-bed, Oborne. Woodwardian Museum. 
(Page 167.) 
3. Cerithium comma, var. near to C. unitorquatum, H. & D. P,, Bridport Har- 
bour. Woodwardian Museum. (Page 168.) 
4. Cerithium circe, D’Orb. I.0., Dorset. Woodwardian Museum. (Page 168.) 
5. Cerithium ‘ commaoides.” Lincolnshire Limestone, Weldon. My collection. 
(Page 169.) 
6. Cerithium pergradatum, sp. nov. Haselbury, ? from the Opalinus-zone. My 
collection. (Page 169.) 
7a. Cerithium “ annulatum.” Lincolnshire Limestone. Sharp collection, British 
Museum. 7b. Section of another specimen, same collection. 
8a. Cerithium clypeus, sp.nov. Clypeus-grit of Rodborough. Witchell collection. 
8b. Section of another specimen. 8’. Variety from the Parkinsoni- 
zone of Aston. My collection. (Page 170.) 
9a. Cerithiwm attritum, sp. nov. Lincolnshire Limestone, Weldon. My collec- 
tion. 9b. Section of another specimen, same collection. (Page 171.) 
10a, 10. Cerithium abbas, sp. nov. Sowerbyi-bed, Bradford Abbas. My collec- 
tion. 10. Section of another specimen, same collection. (Page 172.) 
11. Cerithiwm obornense, sp.nov. Sauzei-bed, Oborne. My collection. (Page 173.) 
12. Cerithium polystrophum, sp. nov. Lincolnshire Limestone, Weldon. My col- 
lection. (Page 173.) 
13. Cerithiwm species or immature form. Lincolnshire Limestone, Weldon. My 
collection. 
