PLATE IV. 



ECHINODERMS OF THE LONDON CLAY. 



Fig. 



1. ASTROPECTEN ARMATUS, p. 29. 



la. Natural size of specimen. 



lb. Marginal plates and spines, magnified. 



2. ASTROPECTEN CRISPATUS, p. 29. 



2a. Upper surface. 

 2b. Under surface. 



3. ASTROPECTEN ? CoLEI,ji). 30. 



3«. Specimen of natural size. 

 '65. Plates and spines. 



4. GONIASTER MARGINATUS, j». 31. 



5. GONIASTER TUBERCULATUS, p. 31. 



5a. Natural size of fragment. 

 5b. A marginal plate magnified. 



6. GONIASTER STOKESII, p. 30. 



Qa and b. Portions of rays. 

 6c. Marginal plates magnified. 



7. Ophiura Wetherelli, p. 32. 



la. Restoration. 



lb. A specimen, natural size. 



1c. Portion of the upper surface of an arm. 



8,9,10. Columns and joints ofPentackinites subbasaltiformis, }>. 34. 



