in natural history, a name given by Dr Hill to the bony palates and mouths of fishes, usually met with either fossile, in single pieces, or in fragments. They are of the same substance with the bisoniæ; and are of very various figures, some broad and short, others longer and slender; some very gibbose, and others plainly arched. They are likewise of various sizes, from the tenth of an inch to two inches in length, and an inch in breadth.