APPENDIX. TAB. XXXI. 



1. 



2. 



3. 

 4. 



/ . 



8. 



9. 

 10. 

 11. 

 12. 



13, 

 14, 

 15, 



Trophon Norvegicum 

 Trophon Turtoni 

 Troplion propinquum ? 



h, apex enlarged. 

 Trophon Fabricii 

 Nassa pj'gnueu 

 Pyrula acclinis 



h, a i)ortion of the matrix, 

 Avitli impression of the ex- 

 terior surface. 

 Mitra cbenus, nat. size 

 Mitra plicifera 

 Canccllaria scalaroides 

 Rissoa soluta 

 Odostomia unidentata 

 Rissoa Therm alis ? . 



h, apex enlarged. 

 (I, h. Lacuna vincta . 

 u, b. JefiFrcysia .- patula 

 u, b. Helix ruderata . 



Page 



312 

 312 

 313 



313 

 315 

 311 



310 

 311 

 316 

 318 

 317 

 319 



316 

 319 

 309 



Fig. 



Page 



318 

 309 

 320 

 308 

 323 

 324 



16. Odostomia truncatula : 



17, a, b. Helix incarnata 

 18j a, b. Paludina marginata 



19. a, b. Helix fruticum . 



20. Pecten polymorphus 



21. Mactra triangulata . 



d, hinge of right valve enlarged. 

 a, exterior slightly enlarged to 

 show regularity of ridges. 



22. Helix ai'bustorum . . 306 



23. Pholadidea . . 325 



24. Aplysia : asciola . . 322 



a, b, outside and inside views. 



25. Pecten maximus . 323 



var. larvatus. 



outside view of flat valve. 



26. Lutraria rugosa 325 



a, inside view of left valve. 



b, outside view of right valve. 



Note. The lines denote the size of specimens. 



