PUGETTIA LORDII. 265 
mud. The sea-bottom in and adjacent to the 
numerous bays, harbours, and long canals—which, 
like the fiords of Norway and Sweden, every- 
where intersect the mainland and inland coasts— 
varies in accordance with the character of the 
bounding rocks: where trap, soft clay slates, or 
felspathic rocks form the coast-line, a thick blue 
clay is the usual bottom; where grit and sand- 
stones, there it is sandy. 
Little, if, indeed anything, is as yet known of 
the deep-sea productions from the west side of 
the Island, which will afford a rich harvest to 
future explorers. 
Pucettia Lorpu, N. §.—Carapace quadrate 
behind the orbits; the anterior portion abruptly 
narrowing, and produced into a double restrum, 
the horns of which divaricate. The anterior 
extremity of the orbital margin is produced to a 
sharp point—that is, elevated slightly above the 
beak; the posterior extremity is defined by a 
distinct fissure. The anterior hepatic region is 
produced by a tooth immediately posterior to 
the postorbital fossa, laterally extended to an 
obtuse tooth or point, and posteriorly separated 
from the branchial regions by a decided fossa or 
lateral constriction. The branchial region is 
laterally produced to a strong anteriorly-curved 
