112 MYtflL US. MUSSEL. 
Mytilus umbillcatus. Pennant, pi. 6S — Donovan, 
pi. 40. ‘ 
Plentifully on the beach at Cove, in Ireland, always soli¬ 
tary, and under rocks and stones, never found in beds nor 
attached by a beard, v. v. 
Variety B. Covered with a rusty yellow glossy skin, 
very thin, clothed with a thick beard about the lower mar¬ 
gin, especially on the anterior side, the foliations of which 
are plain or not serrate on either side. v. v. 
Ivlvtilus barbatus. Pennant , pi. 67- f. 2— Donovan, 
pi. 70. 
Variety C. Flatter and more angular on the anterior side, 
covered with a chesnut-brown skin, clothed almost entirely 
with a viscid beard, the foliations of which are ensiformand 
regularly serrate down one side only. v. v. 
Mytilus Gibsii. Leach, Nat . Miscell. pi. 72. f. 2. 
9. Mytilus discors. Pectinated Mussel, 
Da Costa, pi. 17. f. 1— Donovan, pi. 25— Linn. Trans . 
viii. pi. 3. f. 3— Dorset Cat. pi. 2. f. 1. 
Shell oblong-oval, very convex, transparent, covered with 
a light-brown skin, under which it is whitish stained with 
pale pink, produced and narrower at the anterior end, 
faintly wrinkled transversely, with regular longitudinal ribs 
on both sides, leaving the middle space with only the faint 
transverse str.ee : beaks large, prominent, much turned to 
one side ; inside perlaceous with the ribs visible; the mar¬ 
gin slightly toothed by the ribs at the sides: length half an 
inch j breadth three eighths. 
Sandy shores, and the stalks of Fuci. v. v, 
10. Mytilus discrepans. Discordant Mussel, 
Montagu , pi. 26. f. 4— Linn. Trans, viii. pi. 3. f. 9— 
Walker, f. 79. 
Shell somewhat oval, flattish, rounded and broader at 
the anterior end, faintly striate transversely, and marked 
with longitudinal ribs on each side. Resembles the last, 
but is not so convex, covered with an olive-green skin, 
rounder and broader at the end remote from the hinge, and 
lias only eight or nine ribs on the side near the beak, which 
are 
