EXPLANATION OF PLATES. 399 



FIGURE. PAGE. 



12. Hyolithes (Hyolithellus) micans, Billings. Palaeozoic, 



N. Am., . 92 



13. Pterotlieca (Cvrtotheca) hamula, Hicks. Cambrian, Gt. 



Britain, ' .92 



14. Pterotlieca (Stenotheca) cornucopia, Hicks. Cambrian, 



Gt. Brit., . 92 



15. Conularia Geroldsteinensis, Yern. Palaeozoic, Eur., . 92 



16. Eurybia Gaudichaudi, Eyd. So. Pacific, . . .98 



17. Cymbulia proboscidea, Peron. Mediterranean, . . 93 



18. Tiedemannia Neapolitana, Chiaje. Mediterranean, . 93 



19. Aspidella terranovica, Billings. Huronian, Newfound- 



land, 98 



20. Limacina antarctica, Forbes. Antarctic Seas, fi3°-46°, 94 



21. Spinalis 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, Troscliel. Mediterranean, . . 96 

 2Y. Pneumodermon Peronii, Lam. Atlantic Ocean, . . 97 



28. Pneumodermon ( Spongiobranchia) australis, d'Orb. 



Falkland Is., • ^^ 



29. Pneumodermon (Triclioc^^clus) Dumerilii, Esh. Pacific, 97 



30. Pelagia alba. Quo}'. Amboina, . . . . .97 



31. Cymodocea diaphana, d'Orb. Atlantic, . . .97 



32. Cuvieria (Yaginella) depressa, Daudin. Miocene, Bor- 



deaux, France, ........ 91 



Plate 43. 



1. Murex tenuispina. Lam. Philippines . 



2. Murex (Pteronotus) trigonulus. Lam. Gambia, . 



3. Murex (Cliicoreus) adustus. Philippines, 



4. Murex (Odontopolys) compsorhytis, Gabb. Eocene 



Texas, ........ 



5. Murex (Rhinocantha) cornutus, Linn. West Coast of 



Africa, 



6 Murex (Homalocantha) scorpio, Linn. Moluccas, 



7. Murex (Phyllonotus) radix, Gmel. Panama, 



8. Murex (Cerostoma) Nuttallii, Conr." California, . 



9. Murex (Vitularia) miliaris, Gmel. W. Coast of Africa, 



10. Murex (Ocinebra) erinaceus, Linn. Mediterranean, 



11. Murex (Pterohytis) umbrifer, Conr. Miocene, Yirginia 



12. Urosalpinx Floridana, Conr. Florida, . 



13. Eupleura caudata, Say. Atlantic Coast, U. S., 



14. Typhis tetrapterus, Bronn. Mediterranean, . 



15. Trophon clathratus, Linn. Boreal, 



104 

 105 

 105 



105 



105 

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 105 

 105 

 106 

 106 

 106 

 106 

 107 

 107 

 107 



