MYTILUS. MUSSEL, \1$ 



}5. Mytilus stagnalis. Stagnant Mussel. 



Sowerby, Brit. Miscell. pi. 16. 



Shell oval, convex, of a greenish color which becomes of 

 a yellowish brown towards the margin, and marked with 

 Barker longitudinal rays, strongly striate or somewhat ribbed 

 transversely : length five inches j breadth eight. 



Found in Kew garden. 



16. Mytihis dentatus. Toothed Mussel. 



Shell oval; very convex thin and fragile ; rounded and 

 broader at one end., narrowed and rounded at the other, 

 where the back is depressed, slightly angular and flexuous, 

 irregularly striate transversely, and somewhat wrinkled lon- 



fitudinaliy : color glossy sea-green, growing olive-green or 

 rown at the sides and margin, with numerous faint broken 

 yellowish white longitudinal rays : beaks nearer the broader 

 end, almost obliterated, perlaceous ; inside silvery or fawn- 

 color, often rough with purple perlaceous excrescences 

 towards the hinge and the angular side : in o ; ne valve a 

 small projecting obtuse tooth, placed at some distance from 

 the beak and nearly central, and in the other a transverse 

 cloven one : length three inches and a quarter ; breadth six 

 and a half. 



Whether this be the M. Zellensis of Gmelin, or the M. 

 stagnalis of Spvverby, we are unable to determine : but in- 

 dependently of its shape and markings, the teeth, which 

 are never wanting, are sufficient characters to distinguish 

 it from the two next. 



They are found, but very rarely, in the great bog of 

 Allen, in Ireland, resting upon the soft mud, where they 

 are subject to little or no agitation, v. v. 



1 7. Mytilus cygneus. Swan Mussel 



Lister, pi. 156. f. \\-Pennant, pi. 70 Donovan, pi. 55. 

 Linn. Trans, viii. pi. 3 A. f. 1. 



Shell convex, oval, thin, brittle, rounded at one end, and 

 regularly sloping rather into a point at the other, where it 

 is a little compressed towards the hinge, with rugged 

 transverse wrinkles and protuberances, covered with an 

 olive-green skin, inside perlaceous: hinge small, nearer 



'on* 



