20(1 CONCHYLIA— D/THYi?^. 44. 



Var. c. dimidiatim foliaceo-barbata, foliolis integerrimis. 



half clothed with foliations which are entire on both the 

 edges. 

 Mytilus harbatus. Linn Syst. Nat. p. 1156. 



Chemnitz, viii. p. 168, tab. 84, fig. 749. 

 Pennant, iv. p. 238, tab. 67, fig. 2. 

 Donovan British Shells, ii. tab, 70. 

 Mus. nost. The various seas of the British coasts. 



Shell when full grown four or five inches long, thick coarse, co- 

 vered with a blackish skin which is frequently clothed with some 

 scattered glossy hairs, and has a tendency to curve inwards near the 

 beaks opposite the hinge ; and when about half grown is thinner, 

 of a horn color, and frequently clothed more or less with long leaf- 

 like filaments, which uniformly diifer from those which cover the 

 Modiola Gibsii, in having no serratures down the edges : the very 

 voung are usually marbled or radiate. 



(iihsii. Modiola testa, subtrigond,transversim striata, foliaceo-barbata foliolis 

 hinc serratis. 



Shell somewhat triangular, striate transversely, clothed with folia- 

 tions which are serrated on the edge. 



Modiola Gibsii. Leach, Miscell. ii. p. 34, tab. 72, fig. 2. 



Mus. nost. On the western coasts. 



Shell about two inches long, and one and a half broad, very flat 

 and angular at the anterior side, regularly striate transversely, 

 white and opake under the skin, covered more or less with long foli- 

 ations which are constantly notched down one of the sides. 



