PLATE XVIII. 
Fie. 
1. Pseudomelania procera, Deslongchamps. Murchisonz-zone, Bradford Abbas. 
My Collection (Buckman'). (Page 237.) 
2. The same (lineata-procera). Dogger, Blue Wyke. Leckenby Collection. 
3a. Pseudomelania bicarinata, Wright, MS. Concavus-bed, Bradford Abbas. 
3b. Young specimen; same horizon and locality. Both from my 
Collection (Stephens'). (Page 238.) 
3c. Pseudomelania bicarinata. Opalinus-zone, Burton Bradstock. My Collec- 
tion. 
4a. Pseudomelania heterocycla, Kugtne Deslongchamps. Concavus-bed, Bradford 
Abbas. 4b. The same. Murchisonx-zone, Stoford. Both from my 
Collection. (Page 239.) 
4c. Pseudomelania heterocycla. Specimen from Coker (Murchisonx-zone). 
British Museum. 
5. Pseudomelania “ robusta.”  Opalinus-zone (Moorei-beds), Coaley Peak. My 
Collection (Buckman). (Page 240.) 
6. Pseudomelania “ pinguis.” 
240.) 
7a. Pseudomelania lineata, Sowerby ; variety approaching P. Normaniana, d’Orb. 
Parkinsoni-zone, Burton Bradstock. My Collection. (Page 241.) 
7b. Pseudomelania lineata. Specimen showing spiral puncta. Locality un- 
known. My Collection. 
8a. Pseudomelania Astonensis, sp. nov. Parkinsoni-zone, Aston cutting. My 
Collection. 8b. The same. Lincolnshire Limestone. British Museum. 
(Page 245.) 
9a,9b, 9¢. Pseudomelania coarctata, Deslongchamps. Three specimens show- 
ing different stages of development. Cadomensis-bed (upper part of 
Humphriesianus-zone), Oborne. My Collection. (Page 242.) 
Murchisonx-zone, Coker. My Collection. (Page 
1 These names indicate the source from which the specimen was obtained. 
