168 
LETTERS FROM 
met with a few specimens of the little 
pearly-mouthed shell, the trochus marga- 
ritaceus. 
Near this cove is a remarkable cavern, 
into which we rowed our boat for seventy or 
eighty yards, when we could perceive a 
glimmering of daylight at the end of a nar¬ 
row passage to the right, but the roof was 
so low that w r e could proceed no further in 
that direction. What appeared to be the 
principal branch turned of!' to the left, and 
had we been provided with lights, I should 
have been glad to have explored it further. I 
took no measure of the dimensions, but the 
average width might be about twenty feet, 
and the height from eight to twelve, and the 
water appeared to be of great depth all 
the way. Our boatmen had never entered 
this cavern before, supposing that it ex¬ 
tended only a few yards. The coast from St. 
