Journ. Mar. Biol. Assoc, Vol. VIII. 



Fig. 1. 



Plate VIII. 



M. 9d. S. 31^ W. Edd. , 21 7 miles. 

 Grit, showing large grain, A-l>. 



Ordinary light, x 29. 



Fig. 2. 



M. 9d. S. 31 W. Edd., 21-7 miles. 



Grit, sliowing compound structure of grain ; at end 



A striated felspar, at end B (quartz niosaic. 

 Crossed nicols. x 29. 



To face j). 143. 



