EXPLANATION OF PLATE I. 13 



18. Cestracion Phillippi, Port Jackson Shark, r. (Phillip.) 

 P. 220.* 



18'. Palatal Tooth of Cestracion Phillippi. r. 



19. Tooth of Psammodus, from Derbyshire limestone, f. 

 19'. Tooth of Orodus, from Mountain limestone, near 



Bristol, f. 



20. Calymene. f. \ 



21. Paradoxus, f. > Trilobites. P. 295. 



22. Asaph us. f. ) 



23. Euomphalus. f. 



24. Producta. f. 



25. Spirifer. f. 



26. Actinocrinites. f. (Miller, P. 96.) P. 314. 



27. Platycrinites. f. (Miller, P. 7-l.f) 



27 ft . Fucoides circinatus. f. (Ad. B.) From Transition 

 sandstone, Sweden. 



28. Caryophyllia. r. & f. 



29. Astrea. r. & f. 



30. Turbinolia. r. & f. 



Remains i/i Srcondart/ Strata. 



LAND PLANTS. 



31. Pinus. r. & f. 



32. Thuia. r. & f. 



33. Cycas circinalis. r. Cycadites. f. 



34. Cycas revoluta. r. Cycadites. f. 



35. Zamia horrida. r. Zamia. f. 



36. Dracaena, r. Allied to Bucklandia and Clathraria. f. 



37. Arborescent Fern. r. P. 350. 



38. Pteris aquilina. r. Pecopteris. f. 



* This shark is the only known living representative of the extinct 

 genus Psammodus. 



t Fig. 27. In most, if not all the species of Platycrinites the arms 

 are subdivided ; they are not so in this figure, as from its small size 

 they could not well be represented. The figure is intended to give 

 only a general idea of the subject. 



VOL. II. 2 



