MYA, PANOPEA. 43 
local. More abundant and larger in the Scotch waters than 
farther south. 
Foreign localities —Throughout the northern seas of both 
hemispheres, and probably not extending farther south than 
40° N. lat. 
* Mya truncata, Linné. 
Chama truncata, Da Costa. 
Habitat—At low tide and down to 20 fathoms or so, 
but only young shells (Mya ovalis, Turton) were obtained 
alive in deep water. It is very common in Rothesay Bay 
in sand, clay, and mud; and is largely used for bait by the 
fishermen there. The shells of the Myz in this bay are 
usually discoloured; but in Kamesburgh Bay, where the 
sand is quite clean, very fine examples may be got, as also in 
Fintry Bay,Cumbrae. It is a common shell throughout the 
whole district wherever a suitable station occurs. As arule 
it inhabits a lower zone than Mya arenaria. 
British distribution.—Throughout all our seas and at 
nearly all depths ; very common. 
Foreign localities —Massachusetts (Gould), St. Lawrence 
(Dawson), Northumberland Straits (Whiteaves), Puget Sound 
(Carpenter), Discovery Bay, 81° 41’ N. lat. (Feilden), Iceland 
(Verkriizen), Greenland (Scoresby), Spitzbergen (Katon), 
Norway (Lovév and others), northern and western France 
(Cailliaud and others). Mr. Jeffreys gives the Adriatic as 
a locality for this species, on the authority of Danilo and 
others. 
FAMILY SAXICAVIDE, Swainson. 
PanopgEA, Ménard de la Groye. 
Panopea plicata, Montagu. 
Mytilus plicatus, Montagu ; Sphenia cylindrica, S. Wood. 
Habitat.—I have taken one live individual of this very 
rare species in muddy sand and nullipore at the mouth of 
Loch Gilp, but mistaking it for a variety of Saxicava rugosa 
the specimen was scalded with the vulgar herd, and the 
opportunity of observing the animal (which is unknown) 
was lost. Mr. Robertson has also taken a single living 
specimen off Largs on a muddy bottom. 
Distribution.—Plymouth, Ryde, Bantry, Loch Fyne, Skye, 
Shetland, Moray Firth, and Stonehaven are named by Mr. 
Jeffreys as localities for this shell; he also gives the follow- 
ing foreign localities—Loffoden Islands and Bergen (Sars), 
