No sliding seats or out-riggers are accepted. Normal class entries are Celtic Longboat, Pembrokeshire longboat, Irish East Coast skiff, Irish All Ireland class boat and a variety of Thames skiffs.
This passage specifies that specific types of boats are allowed for a particular purpose or event.  No sliding seats or outriggers are permitted on these vessels. The standard classes include: Celtic Longboat, Pembrokeshire longboat, Irish East Coast skiff, Irish All Ireland class boat, and various Thames skiffs.