==Heads==
<br>
The typology styles 1 to 6 are based on that by Nicola Rogers in [EVANS & LOVELUCK Rogers 2009: p.33]. Styles 7 to 11 15 have been added by the author. The Irish-sea corpus is usually classified using O'Rahilly's typology [O'Rahilly 1973] summarised by Nicholson and Hill [Nicholson & Hill 1997:p.365]. Both types are included in italics under each heading.<br>
<br>
===1: Globular (spherical, ball)===
{{Ref|Macgregor, Mainman & Rogers 1999}}
{{Ref|Morris 2000}}
{{Ref|Nicholson & Hill 1997}}
{{Ref|Ottaway 1992}}
{{Ref|Owen-Crocker 2004}}