212 MYTILID^. 



Moray Firth and Aberdeenshire. The following instances 

 will illustrate its range in depth, — Icolmkill, five fathoms ; 

 coast of Zetland, abundant in Balta Sound in from five to 

 ten fathoms, and ranging in other places as deep as fifty 

 fathoms to fifty-five fathoms ; nine miles off Cape Wrath, 

 sandy ground, and in fifteen fathoms, Moray Firth (M'An- 

 drew). In from seven to fifteen fathoms, Orkneys 

 (Thomas) ; moored by its byssus under stones at low water. 

 Loch Carran (E. F.). " A few odd valves were dredged 

 from about ten fathoms on a shelly bottom in Strangford 

 Lough, by Mr. Hyndman and myself in August, 1832." 

 (W. Thompson.) 



It is a boreal shell, ranging along the coasts of Norway, 

 Greenland, and Boreal America. 



SPURIOUS. 



LiTHODOMUS ABISTATUS, DillwyU, 



Le Ropan, Adanson, Senegal, p. 267, pi. 1 9, f. 2. 



Mytilus lithophagus striatus (1804), J. Sowerby, Linn. Trans, vol. viii. p. 274, 



pi. 6, f. 2. 

 Mytilus aristatus (1817), Dillwyn, Recent Shells, vol. i. p. 303. — Index Tes- 



taceolog. pi. 12, Mytilus, f. 8. 



Modiola caudigera (1819), Lamarck, Anim. s. Vert. vol. vi. pt. I, p. 116. — Do. 



(ed. Desh.) vol. vii. p. 27. — IIanl. Recent Shells, vol. i. p. 



238, pi. 12, Mytilus, f. 8.— Philippi, Abbild. Neuer Conch. 



vol. ii. p. 149, Modiola, pi. 1, f. 5. 



Lithodomus caudigerus,%ovi'ERnY, Genera Shells, Lithod. f. 4. — Reeve, Conch. 



Systemat. pi. 99, f. 4. 

 Lithodomus lithopliagzis (not of authors), Fleming, Brit. Anim. p. 414. — British 



Marine Conch, p. 111. 

 Encyclop6d. Methodiqiie, Vers, pi. 221, f. 8. 



Introduced into British Conchology from having been disco- 

 vered imbedded in stone used for repairing the roads near London, 

 and stirmised to have come from Plymouth. It is a native of 

 Senegal and the West Indies. 



