MARSHALL: ADDITIONS TO ‘‘ BRITISH CONCHOLOGY.” 369 
descriptions, and, stranger still, his plate figures some- 
times differ from his generic ones. 
Var. ovata Jeff.—Dornoch Frith. 
Tellina serrata Brocchi.—(Conch. foss. subapp. II., p. 510, 
t. xil, fig. 1). New to Britain. Dredged off the Mena- 
vawr, Scilly Isles, in 40 fathoms. Two valves. 
I found one small valve several years ago from the 
above district, and some recent dredgings from the same 
ground have yielded another and larger valve, bo*h quite 
fresh and with the delicate sculpture intact, and-% rave no 
doubt whatever that this species is to be found among the 
Scilly Isles. 
T. serrata is unlike any other British Ze//ina. It is 
thin, obtusely triangular, very compressed, and sculptured 
with numerous delicate laminar ridges, which become more 
raised on the posterior ridge. 
Its geographical distribution is Brittany, Portugal, 
Tangiers, Mediterranean, Sea of Marmora, Adriatic, and 
Canaries. Not a common shell. 
T. squalida Pult.—Guernsey and Herm. My largest speci- 
men, from the latter island, is 2 inches by 1? inches. 
T. donacina L.—Half-grown specimens are the prettiest, the 
rays becoming feebler as the shell becomes older. Now 
and then the position of the flexuous gape at the posterior 
end is reversed. Specimens from Guernsey are 14 inches 
broad. 
Var. lantivyi Payr.—There is a variety from Guernsey 
coloured as this, but it is not ‘‘of a thinner texture.” 
A monstrosity from Guernsey has the posterior end 
pinched up, reminding one irresistibly of the central feature 
of a pug dog; and another from the same island has a 
foliaceous plate extending round the inner margins of 
both valves. 
