Pvn H,i I'UitlS

86 PECTINIDJE.
depths. Capt. Beechey, however, dredged a living specimen
off the Mull of Galloway in 1^5 fathoms. It
occurs fossil in our Red and Coralline Crag. Abroad it
ranges from the coast of East Finmark to the iEgean
and the North African coast of the Mediterranean.
Asbjornsen gives the depth at which he found this species
living in Christiania fiord as 5-20 fathoms.
It seldom makes a "nest"; but I have one enclosed
in this way, which I dredged on the north coast of Ire-
land. The case lies within a valve of Mytilus modiolus,
and is composed of large fragments of shells, crabs, and
barnacles. Sars obtained a similar specimen on the
Norwegian coast. In all probability this habit depends
on the nature of the sea-bottom. When the latter is
soft mud the Lima can partly bury itself, and does not
require to be otherwise protected
from its voracious
enemies. The haddock seems fond of it, the shells being
often found in its stomach. The animal of L. Loscombii
differs but little from that of L. hians. The pallial ten-
tacles are somewhat thicker, and the foot is shorter and
of a paler hue. Mr. Clark has seen it " repeatedly fix
itself by fine byssal filaments,
then detach itself and
move with the greatest rapidity, crossing a dish of six
inches diameter whilst one could be counted." When
it crawls it uses its foot in the same way as Modiolaria
discors, by extending and attaching the flexible point to
the surface of the body it is traversing, and then draw-
ing or warping itself up. This mode of locomotion is
much slower than the usual one of swimming by a repetition
of jerks. The fry are ribbed like the adult, but
the lines of division between the strise in the former arc
more remote.
but not of Chem-
It is the Pecten fragilis of Montagu
nitz, the L. bullata of Turton but not the Ostrea bullata