CO^GBYLIA—DITHYRA. 44. h^ 199 



solitary and free, sometimes attached by a byssus ; and reside in 

 deep waters, or among rocks and under stones. 



MoDiOLA testa oblongd laevi, latere antico ohliqui dilatato, umbonibus Modiolus. 



tumidis obtusd angulatis. 

 Shell oblong smooth, with the anterior side obli(juely dilated, the 

 beaks tumid and obtusely angular. 



Tab. nost. 15, fig. 3. Young. 

 Mytilus Modiolus. Linn Syst. Nat. p. 1 158. 



Gmelin, Syst p. 3354, 



Turton, Linn. Syst. iv. p. 293. 



Pennant, iv. p. 238, tab. 69. 



Da Costa, p. 219, tab. 15, fig. 5. 



Donovan, British Shells, i. tab. 23. 



Montagu, Test. Brit. p. 163. 



Linn. Trans, viii. p. 107. 



Turton, British Fauna, p. 164. 



Dorset Catal. p. 40, tab. 12, fig. 5. 



Dillwyn, Descript. Catal. p. 314. 



Turton, Conch. Diet. p. 111. 



Chemnitz, viii. p. 178, tab. 85, fig. 757, 759. 



Lister, Conch, tab. 1057, fig. 5. 

 Var. a, radus violaceis vel rubescentibus. 

 with violet or pale red rays. 



Chemnitz, viii. p. 182, tab. 85, fig. 758. 

 Var. b. margine postico intorto. 



with the hinder margin curling inwards. 

 Mytilus umbilicatus. Pennant, iv. p. 228, tab. 68. 



Donovan, British Shells, ii. tab. 40. 



