PLATE I. 



Localities from which the specimens figured 

 Fig. Names of the shells. page were obtained. 



1. Mostellaria ? gracilenta (nat. 



size) 1 Red Crag, Felixstowe (derived). 



2. Raphitoma submarginata (en- 



larged) 5 Red Crag, Felixstowe (derived). 



3. Trop/ion muricatus, var. exossus 



(enlarged) 3 Red Crag, Felixstowe. 



4. Pleurotoma liarpula (enlarged) 5 1 Crag, Boyton. 



5. — gracilior (enlarged) 4 Red Crag, Walton Naze. 



6. Columbella abbreviata ... 6 Red Crag, Foxball. 



7. Pleurotoma nebula (enlarged). 4 Red Crag. 



8. — turns (nat. size) . 3 Red Crag, Felixstowe (derived). 



9. Trop7io?i ahtiquus, var. des- 



pectus (nat. size) ... 2 Red Crag, Sutton. 



10. a. Columbella erytlirostoma ? (nat. 



size) . 6 Red Crag, Butley. 

 10,(5. — — /(nat. 



size) . 6 Red Crag, Butley. 



11. Menestho Suttone?isis (en- 



larged) 9 Cor. Crag, Sutton. 



12. Odoslomia Reevei (enlarged) . 9 Fluvio-marine Crag, Bramerton (derived?) 



13. Nodostoma ornata (enlarged) 8 Cor. Crag, Sutton. 



14. — eulimelloides (en- 

 larged) 8 Cor. Crag, Sutton. 



15. Margarita crassi-striata (en- 



larged) 10 ? Crag, Boyton. 



16. a. Siliquaria parva (enlarged) . 1 ] ^ Fluvio-marine Crag, Bramerton (de- 



16, b. — — (enlarged) . 11 J rived?) 



17. Pecten disparatus (nat. size) . 12 Red Crag. 



