288 SMART AND COOKE: MARINE SHELLS OF SCILLY. 



Anomia ephippium L. — Full-grown specimens rare, young 

 shells common on sea weed ; all the varieties occur, and 

 one not noticed by Jeffreys, in which the beaks are 

 remarkably prominent. 



Ostrea edulis L. — Rare. Odd valves occasionally thrown up. 

 An attempt was made, fifteen or twenty years ago, to 

 introduce the species, but without success. 



Pecten pusio L. — Young specimens dredged in forty fathoms, 

 gravel, outside Menavawr Rock. 



P, varius L. — Same ground as J^. pusio, but not so abundant. 



P. opercularis L. — Young specimens common under stones, 

 and on seaweed at low water mark ; also in stony ground 

 outside Menavawr ; full grown specimens very rare, on 

 Zostera beds with J^. maxinms ; also adhering to the bottom 

 of a coal hulk off South End of Tresco. 



P. tigrinus Miill. — Not uncommon in stony ground outside 

 Menavawr. 



P. tigrinus var. costata Miill. — With the type. 



P. similis I.askey. — Not uncommon in certain places outside 

 Menavawr, but local and rather small. 



P. maximus L. — Common on Zostera beds at low watermark 

 of spring tides inside the islands. Obtained by observing 

 the spot where a jet of water is thrown out by a sudden 

 closing of the valves, otherwise no amount of searching 

 would discover them. 



Lima Loscombii Sby. — Living specimens rare, single valves 

 tolerably common outside Menavawr. 



L. hians var. tenera Gmel. — Single valves only, with L. 

 Loscombii. 



L. subauriculata Mont. — One or two valves only, with Z./^/a^i-. 



Pinna rudis L. — In Zostera beds at low water mark, spring 

 tides, with P. maximus, but by no means numerous, and 

 difficult to find, since the edge of the shell only stands about 

 an inch above the mud, and is often enveloped in, or over- 

 grown by weed. 



J.C, iv., Jan., 1885. 



