EXPLANATION OF PLATES. 399 
FIGURE. PAGE. 
12. Hyolithes (Hyolithellus) micans, Billings. Paleozoic, 
N. A 
. Am., ‘ : ; : : : s ; = Se 
13. Pterotheea (Cyrtotheca) hamula, Hicks. Cambrian, Gt. 
Britain, : : : > 92 
14. Pterotheca (Stenothec 2) cornucopia, Hicks. Cambrian, 
; Gt. Brite : : = «92 
15. Conularia Geroldsteinensis, Vern. “Paleozoic, Wars >= «92 
16. Eurybia Gaudichandi, Eyd. So:'Paerfie, °*7: fo Spt ah ec) 
17. Cymbulia proboscidea, Peron. Mediterranean, . > 98 
18. Tiedemannia Neapolitana, Chiaje. Mediterranean, . 93 
19. Aspidella terranovica, Billings. Huronian, Newfound- 
land, .. x ; ; 4 : e 98 
20. Limacina antarctica, Forbes. Antarctic Seas, 63°-46°, 94 
21. Spirialis ventricosa, Eyd. Atlantic Ocean, . 94 
22. Spirialis (Helcionoides) inflata, d’Orb. Atlantic Ocean, 95 
23. Spirialis (Euromus) clathrata, Eyd. Pacific Ocean, . 95 
24. Agadina cucullata, Gould. Antarctic, ; : ‘ : 95 
25. Clio borealis, Brug. Arctic Seas, . : : . 96 
26. Clionopsis Krohnii, Troschel. Mediterranean, ; . 96 
27. Pneumodermon Peronii, Lam. Atlantic Ocean, : 97 
28. Pneumodermon (Spongiobranchia) australis, d’Orb. 
Falkland Is., ; 97 
29, Pneumodermon (‘Trichocyclus) Dumerilii, Esh. Pacific, 97 
30. Pelagia alba, Quoy. Amboina,_. : , 97 
31. Cymodocea diaphana, d’Orb. ‘Atlantic, : . a ON 
32. Cuvieria (Vaginella) depressa, Daudin. Miocene, Bor- 
deaux, France, . : , : . ; : = Oil 
PLATE 43. 
1. Murex tenuispina, Lam. Philippines —. : . 104 
2. Murex (Pteronotus) trigonulus, Lam. Gambia, ; - 105 
3. Murex (Chicoreus) adustus. Philippines, . ' . 105 
4. Murex (Odontopolys) compsorhytis, Gabb. Eocene, 
Messe : 105 
5. Murex (Rhinocantha) cornutus, Linn. "West Coast of 
Africa, : . 105 
6. Murex (Homalocantha) scorpio, Linn, “Moluccas, -» 105 
7. Murex (Phyllonotus) radix, Gmel. Panama, ; ie See 15 
8. Murex (Cerostoma ) Nuttallii, Conr. ‘California; Sa ee UDO 
--9. Murex (Vitularia) miliaris, Gmel: W. Coast of. Africa: 106 
10. Murex (Ocinebra) erinaceus, Linn. Mediterranean, "106 
11. Murex (Pterobytis)umbrifer, Conr. - Miocene lve 106 
12. Urosalpinx Floridana, Conr. Florida, .- . 106 
13. Eupleura caudata, Say. Atlantic Coast, OLA ape sie Cy 
14. Typhis tetrapterus, Bronn. Mediterranean, . ; . LOT 
15. Trophon clatbratus, Linu. Boreal, 9. - - , . *107 
