PLATE XVIII. 
Fig. 
1. Pseudomelania procera, Deslongchamps. MurchisonsB-zone, Bradford Abbas. 
My Collection (Buckman^). (Page 237.) 
2. The same (lineata-procera) . Dogger, Blue Wyke. Leckenby Collection. 
3 a. Pseudomelania hicarinata, Wright, MS. Concavus-bed, Bradford Abbas. 
3 b. Young specimen ; same horizon and locality. Both from my 
Collection (Stephens^). (Page 238.) 
3 c. Pseudomelania hicarinata. Opalinus-zone, Burton Bradstock. My Collec- 
tion. 
4 a. Pseudomelania heterocycla, Eugene Deslongchamps. Concavus-bed, Bradford 
Abbas. 4&. The same. Murcliisonse-zoue, Stoford. Both from my 
Collection. (Page 239.) 
4 c. Pseudomslania heterocycla. Specimen from Coker {Murchisonse-zone). 
British Museum. 
5. Pseudomelania “ robusta.’’ Opalinus-zone (Mborei-beds), Coaley Peak. My 
Collection (Buckman). (Page 240.) 
6. Pseudomelania pinguis.’’ Murchisonx-zone, Coker. My Collection. (Page 
240.) 
7 a. Pseudomelania lineata, Sower by ; variety approaching P. Normaniana, d’Orb. 
Parldnsoni-zone, Burton Bradstock. My Collection. (Page 241.) 
7 b. Pseudomelania lineata. Specimen showing spiral puncta. Locality un- 
known. My Collection. 
8 a. Pseudomelania Astonensis, noY. Parldnsoni-zone, Aston cutting. My 
Collection. 8 b. The same. Lincolnshire Limestone. British Museum. 
(Page 245.) 
9 a, 9 b, 9 c. Pseudomelania coarctata, Deslongchamps. Three specimens show- 
ing different stages of development. Gadomensis-bed (upper part of 
Humphriesianus-zone), Oborne. My Collection. (Page 242.) 
’ These names indicate the source from which the specimen was obtained. 
