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Abstract
The various types of bladder‐like swellings are discussed and a new term, “hymena,” is introduced for swollen layers that are smooth on both their upper and lower surfaces. A new genus Psilohymena is defined and two species, P. mirabilis (Luber) comb. nov. and P. psiloptera (Luber) comb. nov., are assigned to it. P. mirabilis is the type species. A variation study of the degree of swelling of the hymena is given.