606 
Proceedings of the Royal Society 
and the comparative absence of rock-miners.^ The sole examples 
of the latter lurked between stones that had been fixed together by 
a laminarian root, in the interstices of the latter, on rocks, in peat, 
never in an independent tunnel. The drift-wood, again, is almost 
universally perforated by the Teredo, and many logs are so hone}''- 
combed, that they are only fit for firewood, or the cabinet of the 
naturalist. Teredo norvagica and T. megotara were the two species 
observed. The total number of mollusca (proper) recognised was 
145 ; of which sixty-three were Lamellibranchiate, eighty-one 
Cephalophorous, and one Cephalopodous. 
Between tide-marks the prevalence of Trochus zizyphinus was 
characteristic. The women and children still gather Littorina 
littorea for sale. The inherent apathy of the islander prevents 
him taking due advantage of the occurrence of Mytilus edulis in 
the creeks ; and he is to be seen fishing with a scrap of limpet or 
cockle, rather than trouble himself to procure the former for bait. 
The somewhat rare Tapes decussata is met with in the sand at low 
water. Fisurella reticulata and Emarginida reticulata are abundant 
under stones in the same region. Doris proxima is common on the 
floating blades of fuci at low water ; and most of the Nudibranchs (17 
* The rocks are for the most part composed of gneiss. 
