NATURAL HISTORY SOCIETY OF GLASGOW. 



25 



overboard with other rubbish. They are not uncommon on the 

 oyster shells. While generally moulded on the object to which 

 they are attached, and similar in form, yet when adherent to small 

 ■stones, or the edge of a stone, many have the upj)er valve most 

 beautifully curved over at the edge, and often grooved and ribbed. 

 The inner surface is brilliantly iridescent, as is conspicuously dis- 

 played in the numerous valves strewn on the beach. Many are 

 also met with which appear to have become separated from the 

 early object of their attachment, and, having been tossed about in 

 many ups and downs, want the grace and elegance of those which 

 have been well settled in life. In such, the perforation in the 

 under valve is usually closed by a small scale of slate or stone. 

 The following list of shells collected by us contains 45 species. 

 »*«,^To these we are able to add 6 from a list kindly drawn out by the 

 Rev. A. Urquhart, Portpatrick. We have marked all Ids species 

 with an asterisk: — 



. . Very abundant, 



. . Common, . . 



. . Not uncommon, 



*Pholas Candida, . . 

 *Mya truncata, . . 



— arenaria, . . 

 Solen ensis. 



— siliqua. 

 *Psammobia vespertina, 

 *Tellina solidula, . . 

 *Mactra subtruncata, 



— solida, . . 

 *Tapes aurea, . . . 



* — decussata, . . 



* — puUastra, . . 

 Artemis exoleta, . . 



— lincta. 

 *Venus striatula, , . 

 *Cardium edule, . . 



— echinatum, 



— Norvegicum, 



— pygmaeum, 

 Pectunculus glycimeris, 

 *Modiola Modiolus, 

 *Mytilus eduHs, . 

 Crenella marmorta, 

 *Pecten maximus, 



West shore. 



East and West shores. 



East most abundant. 



Common, . . West shore. 



Not uncommon, „ 



Common, . Abundant at Kirkcolm. 



„ . . West, abundant. 



„ . . East, abundant. 



>> 

 Kirkcolm. 



Not uncommon. 

 Common, 



East, abundant. 

 Kirkcolm. 



Dredged. 



Common. 



„ . Head of loch, abundant. 



Abundant in Ascidia mentula. 

 Rare. 



D 



