OF NORTHUMBERLAND AND DURHAM. 185 
thinner variety from deeper water, which is smoother and more 
produced at the posterior end. The latter is rather rare. 
4, M. stunttorvum, Linn. 
Mactra stultorum, Mont. Test. Brit. 94. 
Var. Mactra cinerea, Mont. Test. Brit. Supp. 35. 
Common on most of our shores, living just beyond low-water 
mark. The plain variety (J/. cinerea, Mont.) is rather rare. 
Famity. Lucrnipa, D’Orbigny. 
101. LUCINA, Bruguiére. 
1. L. BorEALIs, Linn. 
Tellina radula, Mont. Test. Brit. 68, t. 2, f. 1, 2. 
Embleton Bay, near low-water mark, plentiful Mr. Rk. Em- 
bleton. Not common on other parts of the coast. Whitburn.— 
Rev. G. C. Abbes. Cullercoats.—J. A. 
L. spinifera, Mont., is stated in Mr. Hogg’s Natural History 
of Stockton to have been found at Seaton by Sir W. C. Tre- 
velyan, Bart. 
L. lactea, Mont., has been got at the same place by Mr. Hogg. 
L. rotundata, Mont., also got at Seaton by Sir W. C. Tre- 
velyan, and a single valve has occurred to the Rev. G. C. Abbes 
at Whitburn; but we suspect that this and the last, which 
are south country species, have been derived from ballast. 
102. CRYPTODON, Turton. 
1. C. ruexvosus, Mont. 
Tellina flexuosa, Mont. Test. Brit. 72. 
Axinus flexuosus, King in Ann. Nat. Hist. xviii. 242. 
Rare. Two or three specimens have been found at different 
times at Whitburn by the Rev. G. C. Abbes, where it has also 
been got by Mr. Howse, who afterwards dredged it in seventeen 
fathoms off that place. Mr. King has met with one specimen 
from the fishing-boats, which he states “came up on the lines 
after they had been down in thirty fathoms water, twenty-five 
miles east of the Fern Islands.” 
VOL, I. Bb 
