212 MYTILIDiE. 



Moray Firth and Aberdeenshire. The following instances 

 will illustrate its range in depth, — Iculmkill, 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, L832. r ' 

 (W. Thompson.) 



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

 Greenland, and Boreal America. 



SPURIOUS. 



LlTHODOMUS ARISTATUS, Dillwyil. 



Le liopan, Adanson, Senegal, p. 267, pi. 19, f. 2. 



Mytilus lithophagus striatus (1804), J. Sowerby, Linn. Trans, vol. viii. p. '27-1, 



pi. 6, f. 2. 

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



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



Modiola eaudigeru (1819), Lamarck, Anim. s. Vert. vol. vi. pt. 1, p. 116. — Do. 



(ed. Desh.) vol. vii. p. 27. — Hanl. 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 caudigcrus, Sowerby , Genera Shells, Lithod. f. 4. — Reeve, Conch. 



Systemat. pi. 99, f. 4. 

 Lithodomus lithophagus (not of authors), Fleming, Brit. Anirn. p. 414. — British 



Marine Conch, p. 111. 

 Encycloped. Methodique, 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 surmised to have come from Plymouth. It is a native <>/' 

 Senegal and the West Indies. 



