XIIL FOSSILS OF THE PERIOD. 329 



ECHINODERMATA. 



Cidaris horrida. Wr. K. C. Wotton-Basset. 



spinosa. Wr. K.C.u. Hartwell. 

 Ecbinobrissus Brodiiei. Wr. P. K. Brill. 

 Heinicidaris Brillensis. Wr. P. R. Brill. 



Davidsoni. Wr. P.S. 



Hemipedina Cunningtoni. Wr. K. C. u. Hartwell. 

 Morrisii. Wr. K. C . u. Hartwell. 





Diagram CXX V. Wood from Kimmeridge Clay. 



i. Magnified view of a longitudinal and tangential section of wood found in the 

 calcareous bed near the base of the Kimmeridge clay in Shotover Hill. It shews 

 cross sections of the medullary rays, and longitudinal sections of the vessels inter- 

 rupted by what seem to be cracks or fissures, though some are doubtless natural 

 divisions. The diameters of the vessels are between ^1^ and 275W ^ an i n h. 

 2. More highly magnified, to shew the undulated and semispiral arrangement of 

 what seem to be small dots od of an inch in diameter. 



ANNELLIDA. 



Serpula sulcata. Sow. K.C., P. R. Shotover. 

 tetragona. Sow. K.C. Wotton-Basset. 



tricarinata. Wr. K.C.u. Hartwell. 

 CRUSTACEA. Fragments only as yet observed. 

 POLYZOA. None as yet collected. 

 BRACHIOPODA. 



Discina Humphriesiana. Sow. K. C. Studley. 



latissima. <ow. K. C. 1. Shotover, u. Culham. 

 Lingula ovalis. K. C. 1. Shotover. 

 Rhynchonella inconstans. Sow. K. C. 1. Shotover. 



The fewness of these invertebrata in this the uppermost of the 

 oolitic groups corresponds with the idea of the gradual decay 

 and final disappearance of the oolitic system of organic life and 

 mineral deposits. 



