192 CATALOGUE OF THE MOLLUSCA 
113. LYONSIA, Turton. 
1. L. Norvrerca, Chemn. 
Lyonsia striata, Turt. Brit. Biv. 35, t. 3, f. 6, 7. 
From the fishing boats, Cullercoats, rare. Seaton Carew.— 
Miss FE. Backhouse. Whitburn.—Rev. G. C. Abbes, and Mr. R. 
Howse. 
Famity. Myapa, Fleming. 
114. LUTRARIA, Lamarck. 
1. L. evurprica, Lam. 
Mactra lutraria, Mont. Test. Brit. 99. 
On sandy beaches near and below low-water mark, rather local, 
but abundant in some places. Blyth sands. Embleton.—W/r. 
fi. Embleton. Hartlepool and Seaton. “Ad ostium fluminis 
Tees copiossissimé reperiunter.’— Lister Anim. Angl. 171, 
Anno 1678. 
A thick and rather more elongated variety is found on this 
coast, which has been sometimes taken for Z. oblonga. It is 
figured by Capt. Brown (Illust. Rec. Conch. t. 43, f. 3), from a 
specimen in the cabinet at Wallington. 
115. MYA, Linneus. 
1. M. rruncata, Linn. 
Mya truncata, Mont. Test. Brit. 32. 
Within tide marks on a stony bottom mixed with sand and 
mud, where it lives buried just deep enough to reach the surface 
with its long tube when the tide is up: mostly at the mouths of 
rivers. Low Lights, where it was first observed by the Rey. W. 
Mark. It was noticed by Lister at the mouth of the Tees, It 
occurs also in deeper water, and Mr. King dredged dead shells in 
50 fathoms, not far from the edge of the Dogger-bank, and about 
sixty miles east of Sunderland. 
Mya Uddevallensis, Forbes. Two or three dead valves of this 
species have been got from the deep-water fishing boats. Mr. 
King supposes them to be fossil, and that the shell-bank from 
which they were obtained may be a Pleistocene stratum, existing 
