FOSSILS OF LIASS1C SYSTEM. 



55 



Walcot, (fig. 73), the last of the race, the giant plagio' stoma, (fig 

 75), and the spinous plica tula, (fig. 74). 



Pig 71. Gry'phea arena ta. 



Fig. 72. Ammonites Buckla'ndii 



Fig.lS.Spi'rifcr Walcoti. 



Fig. 1. Plica' tula Spino'sa. 



Fig. 75. Plagio'stoma giga'nteum. 



37. The superior part of the lias contains a great number of 

 belemnites, (figs. 76, 77), the ammonite named after Walcot, (fig 

 78), and an a'vicula with unequal valves, (fig. 79), &c. 



Fig. 76. Bele'mnites pistillifo'rmis. 



Fig. 77. Bele'mnites Sulca'tus. 



37. What fossils beloig to the upper part of the Lias ? 

 26 



