ras. 
ibe 
ep 
3—10. 
1k 
Paneer 
iiise 
19, 20. 
2s 
PLATH XXXVIII. 
Panopna (continued). 
P. Meyeri, Woods. Upper Greensand, Blackdown. Sedgwick Museum, 
Cambridge. a, right valve; b, dorsal view. (P. 229.) 
P. spilshiensis, Woods. Spilsby Sandstone, Donnington. Sedgwick 
Museum. Internal cast. a, right valve; ), dorsal view. (P. 222.) 
Genus—Martesta, Leach. 
M. constricta (Phill.). 38—6, Speeton Clay, Speeton. 7—10, Gault, 
Folkestone. Mainly internal casts. (P. 231.) 
3. York Museum. Right valve. 
4. British Museum, No. L21607. Right valve. x 1}. 
5. Sedgwick Museum. a, right valve; b, dorsal view of both valves. x 1. 
6. Sedgwick Museum. a, left valve, x 13; b, anterior view, x 13; c, portion 
of shell near the ventral margin x 10. 
7. Museum of Practical Geology, No. 23487. Right valve. x 1}. 
8. British Museum, No. 14997. Left valve with shell preserved. x 2. 
9. British Museum, No. L4997. a, anterior view; b, dorsal view. Part of the 
shell is preserved. x 2. 
10. Museum of Practical Geology, No. 23486. Right valve. 
M. prisca (Sow.). Hythe Beds of Maidstone. Museum of Practical 
Geology, No. 23474. Internal cast of right valve. (P. 232.) 
M.? rotunda (Sow.). Chalk Rock, Cuckhamsley. Sedgwick Museum. 
12, internal cast; a, left valve; b, dorsal view; ¢, anterior view. 13, 
right valve—drawn from a wax mould of the exterior, partly restored. 
K-25 ((P2388,) 
Genus—Turnus, Gabb. 
1’. Dallasi (Walker). Lower Greensand, Potton. Sedgwick Museum. 
Internal casts. 14, the Type; a, right valve; b, dorsal view. 15, 
right valve. x 2. (P. 283.) 
T. sp. Gault, Folkestone. x 12. (P. 234.) 
16. British Museum, No. L4996. a, right valve, with part of shell preserved ; 
b, dorsal view. 
17. Sedgwick Museum. Internal cast of left valve. 
T’. sp. Upper Greensand, Blackdown. British Museum, No. 24335. 
Left valve. x 14. (P. 235.) 
T'.? amphisbena (Goldf.). Upper or Middle Chalk, Sussex. Sedgwick 
Museum. (P. 235.) 
Genus—TeErEvDo, Linneus. 
T. gaultina, Woods. Gault, Folkestone. Museum of Practical Geology, 
No. 23485. Right valve. x 2. (P. 287.) 
