PLATE XXXVlll. 



Panopea (continued). 

 Figs. 



1 . P. Mt'ijcri, Woods. Upper Greensand, Blackdown. Sedgwick Museum, 



Cambridge, a, right valve ; h, dorsal view. (P. 229.) 



2. P. spilslticu.ns, Woods. Spilsby Sandstone, Donnington. Sedgwick 



Museum. Internal cast, a, right valve ; h, dorsal view. (P. 222.) 



Genus — Martesia, Leach. 



3—10. .1/". constricta (Phill.). 3—6, Speeton Clay, Speeton. 7— 1(», Gault, 

 Folkestone. Mainly internal casts. (P. 231.) 



3. York Museum. Right valve. 



4. British Museum, No. L21607. Kight valve. xl,\. 



5. Sedgwick Museum, a, right valve ; 6, dorsal view of both valves, x li. 



6. Sedgwick Museum, n, left valve, x Ig ; 6, anterior view, x li; f, portion 



of shell near the ventral margin x 10. 



7. Museum of Practical Geology, No. 23487. Eight valve, x U. 



8. British Museum, No. L4997. Left valve with sliell preserved, x '2. 



9. British Museum, No. L4997. a, anterior view ; 6, dorsal view. Part of the 



shell is preserved, x 2. 

 10. Museum of Practical Geology, No. 23486. Eight valve. 



n. M. piisca (Sow.). Hythe Beds of Maidstone. Museum of Practical 

 Geology, No. 23474. Internal cast of right valve. (P. 232.) 



12, 13. M. ? rotunda (Sow.). Chalk Rock, Cuckhamsley. Sedgwick Museum. 

 12, internal cast; a, left valve; h, dorsal view; c, anterinr view. 13, 

 right valve — drawn from a wax mould of the exterior, partly restored. 

 X 2. (P. 233.) 



Genus — Turnus, Guhb. 



14, 15. T. Dallasl (Walker). Lower Greensand, Potton. Sedgwick Museum. 

 Internal casts. 14, the Type; a, i-ight valve; h, dorsal view. 15, 

 right valve. X 2. (P. 233.) 



K;, 17. 7'. sp. Gault, Folkestone. X U. (P. 234.) 



16. British Museum, No. L4996. u, right valve, with part of shi'll preserved ; 



6, dorsal view. 



17. Sedgwick Musemu. Internal cast of left valve. 



18. T. sjj. Upper Greensand, Blackdown. British Museum, No. 24335. 

 Left valve, x 1^. (P. 235.) 



19, 20. T.? amijhishsena (Goldf.). Upper or Middle Chalk, Sussex. Sedgwick 

 Museum. (P. 235.) 



Genus — Teredo, Linnaeus. 



21. T. gaidtina, Woods. Gault, Folkestone. Museum of Practical Geology, 

 No. 28485. Right valve. X 2. (P. 237.) 



