246 TRANSACTIONS, NATCKAf. HISTORr SOCIETY OF GLASGOW. 



Anoinia ephipjnum, Linn. — Common ; fixed to other 



shells, sea-weeds, crabs, etc. 

 Ostrea edulis, Linn. — Frequent, but never with 



animal. 

 Pecten opercularis, Linn.— Scarce. 

 varius, Linn. — Very rare. 

 maxhmis, Linn. — Scarce. 

 Mytilus edulis, Linn. — Frequent. 



modiolus, Linn. — Rare. 

 Pectunculus glycymeris, Linn. — Rare. 

 Liicina borxalis, Linn. — Rare. 



Gardium echinatum, Linn. — Frequent, but never 



with animal. 

 edule, Linn. — Frequent. 

 norvegicum, Speng. — Frequent. 

 Cypt^ina islandica, Linn. — Frequent as single valves 



brought ashore by sea- weeds. 

 It may possibly come from a 

 glacial bed, but I do not think 

 so, never having found a truly 

 boreal shell on this beach.* 

 Venus exoleta, Linn. — Frequent. 

 lincta, Pult. — Frequent. 

 fasciata. Da Costa. — Rare. 

 verrucosa, Linn. — Rare. 

 gallina, Linn. —Common. 

 Tapes aureus, Gmel. — Rare. 



virgineus, Linn. — Rare. 

 pullastra, Mont. — Scarce. 

 decussatus, Linn. — Scarce. 

 Tellina crassa, Ghiel. — Rare. 



balthica, Linn.— One shell. 

 tenuis, Da Costa. — Abundant. 

 fahida, Gron. — Common. 

 Psamniohia ferroensis, Chemn. — Scarce. 



* Since the above was written, a small sliell of this species, containing the 

 animal has been cast ashore. 



Note.— This last winter (1891-92.) I have got a valve of Astarte borealis, 

 and one of Pecten islandicus ; but both have probably been washed out of 

 some clay dug up when the gasometer last erected at Troon was being founded. 

 This clay contained other Arctic shells. 



