Six cases of spermatocytic seminoma are reported, and the literature on the subject is reviewed. This neoplasm occurs in elderly persons, is grossly characterized by a gelatinous appearance, and has distinctive microscopic characteristics. Its degree of differentiation is far greater than that exhibited by classical seminoma, a tumor from which it should be separated. It is exclusively limited to the testicle and is never associated with teratomatous elements. Claims that it has a less favorable prognosis than classical seminoma are refuted; instead it is shown that the reverse is probably true. The large majority of patients have been cured by orchiectomy, whether or not postoperative irradiation therapy had been administered.