112 MYTILUS. MUSSEL. 



Mytilus umbilicatus. Pennant, pi. 68 -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. 



Mytilus 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 

 -^vith a viscid beard, the foliations of which are ensiform and 

 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 Do no van, pi. 25 Linn. Trans. 

 viii. pi. 3. f. B 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 striae : 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, flatfish, 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, arid 

 has only eight or nine ribs on the side near the beak, which 



are 



