OF NORTHUMBERLAND AND DURHAM. 189 
The animal of this species has the same large anterior sipho- 
nal tube as the last ; the foot, too, is long and strap-shaped, but 
a little more robust than that of A. suborbicularis. 
M. Récluz has separated this species from Kellia, and has 
formed of it, and some other small shells, the genus Peronia, 
We have carefully read over M. Récluz’s very elaborate descrip- 
tion, with our British specimens before us, and cannot perceive 
any difference between this and the last species that can be con- 
sidered more than specific. The ligament, upon which M. 
Récluz founds a part of his distinction, appears to us to occupy 
the same situation in each, with the exception that it is longer 
and more deeply seated in K. rubra than in K. suborbicularis. 
The teeth, too, are pretty nearly alike in number and position, 
though a little different in form. Taking, therefore, into consi- 
deration the similarity of the animals, we see no good reason for 
dividing them. The characters of the animal of Peronia given 
by M. Récluz are indeed very different from ours, but he does 
not appear to have met with it in a living state, and has conse- 
quently taken them from the Peron of Adanson, which from its 
external ligament and two posterior tubes, appear to be a dis- 
tinct genus. 
107. TURTONIA, Hanley. 
1. T. minuta, Fab. 
Venus minuta, Fab. Fau. Greenl. 412. 
Mya purpurea, Mont. Test. Brit. Supp. 21. 
On small sea-weeds, in pools within tide-marks, common. 
The animal of this species differs very considerably from that 
of Kellia. The mantle is widely open anteriorly, giving passage 
to a strong foot, broad towards the body, and angulate at the 
posterior base. There is only a single siphon, which is very 
small and slender, and is placed at the posterior or elongated end 
of the shell, 
108. MONTACUTA, Turton. 
1. M. srpentata, Mont. 
Mya bidentata, Mont. Test. Brit. 44, t. 26, f. 5. 
From the fishing boats, and in sand, not uncommon, 
